Page 1 Ultra Heat GMV6 Mini DC Inverter VRF Units Capacity: 36000Btu/h~60000Btu/h Rated Frequency: 60Hz Operation Range: Cooling: -18*~54°C(0*~129°F) Heating: -30~27°C(-22~81°F)
Page 2: Table Of Contents
Contents Chapter 1 Product ........................ 2 1 Unit List ..........................2 2 Parameters ......................... 2 3 The Range of Production Working Temperature ..............3 Chapter 2 Commissioning ....................4 1 Commissioning Process ...................... 4 2 Safety Requirements......................4 3 Unit Commissioning ......................5 4 Unit Function Settings .......................
Page 3 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Preface Thank you for purchasing Ultra Heat GMV6 Mini DC Inverter VRF Units. For correct operation, please read this manual carefully. This manual applies to Ultra Heat GMV6 Mini DC Inverter VRF Units. It clarifies the safety requirements, basic principles and implementation methods in engineering commissioning, troubleshooting, and after-sales maintenance.
Page 4: Chapter 1 Product
Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Chapter 1 Product 1 Unit List 1.1 Basic Modules Product Code Model Power External view CN851W4090 GMV-V36WL/C-T(U) 208/230V ~60Hz CN850W1220 GMV-V48WL/C-T(U) 208/230V ~60Hz CN850W1210 GMV-V60WL/C-T(U) 208/230V ~60Hz 2 Parameters 2.1 Parameters of Basic Modules...
Page 5: The Range Of Production Working Temperature
Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Note: ① Sound Pressure Level: Anechoic chamber conversion value, measured in a semi-anechoic room. During actual operation, the value may be higher due to ambient noise and echoes of the installation conditions.
Page 6: Chapter 2 Commissioning
Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Chapter 2 Commissioning WARNING! Before performing operations (such as commissioning, maintenance, and repair) on the device, you need to shut down the unit and cut off the power, and use a relevant instrument to ensure that the voltage at the power input terminal is zero, and the power indicator on the main board is off.
Page 7: Unit Commissioning
Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 3 Unit Commissioning 3.1 Preparation 3.1.1 Tools Name Picture Screwdrivers Spanner Hex key Pincers Vacuum pump Electronic balance Pressure gauge Multimeter...
Page 8 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 3.1.2 Files To record the installation and commissioning of the unit, all the following documents need to be prepared: minutes of the pre-commissioning scheme determining meeting, commissioning personnel record form, pre-commissioning checklist, commissioning data record form, and commissioning report.
Page 9 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Commissioning data record form Project name: Unit model: Debugger: Date: Rated capacity of Rated capacity of Total length of the the outdoor unit the indoor unit refrigerant pipe (kW):...
Page 10 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 3.2 Check Items after Installation and Test Operation 3.2.1 Check Items after Installation Check items Possible conditions due to improper installation Check Each part of the unit is installed securely? Unit may drop, shake or emit noise.
Page 11 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 3.2.2.2 Test Operation and Debugging Description of test operation procedures and main board display of ODU Description of each stage of debugging progress — Debugging code Code meaning and operation method...
Page 12 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Description of each stage of debugging progress — Debugging code Code meaning and operation method Progress Code Display status Outdoor component’s error. Besides “06”, the other blinking will display the related error code. After errors are...
Page 13 Step 1: Install the commissioning software. Install the commissioning software on a PC, and connect the monitoring communication cable. (For details, see Gree Debugger.) Step 2: Power on the indoor and outdoor units. Power on all indoor and outdoor units. In this case, all modules of the outdoor unit indicate that the unit is in "Not commissioning"...
Page 14 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Click "Debug" to switch to the engineering commissioning interface. The unit will automatically operate the commissioning modules listed in this interface from top to bottom and from left to right. Note: The commissioning function only applies to the single-system network.
Page 15 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual " " to display relevant information detected on this phase, which provides references for selection. Click "Close" to close the information (the number of commissioning units is displayed in "3 Confirm number of outdoor basic modules"...
Page 16 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual " " indicates that commissioning is not passed on the phase and troubleshooting is required (after troubleshooting, the unit automatically enters the next step if no "OK" exists or click "OK" to enter the next step).
Page 17 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual The system automatically enters the stage of confirming the unit start-up and commissioning, with LEDs cyclically displaying "12" and "AP", waiting for confirmation of the unit start-up and commissioning command, and pressing the SW3 confirmation key to confirm the unit start-up and commissioning.
Page 18 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 3.2.4 Unit Commissioning by Using Multi-functional Debugger Step 1: Connect multi-functional debugger. For details, see the user manual of multi-functional debugger. Step 2: Click Unit Debug on the home page to enter the commissioning page.
Page 19 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 3.2.6 Reference Values of Unit Normal Operation Parameters (Commissioning Check) Debug item Parameter name Unit Reference Outdoor °C(°F) — temperature  When compressor starts, discharge temp in cool mode is within 70~105°C(158~221°F) and at least 10°C(50°F) higher than the high...
Page 20 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Debug item Parameter name Unit Reference IDU ambient °C(°F) — temperature  According to ambient temperature, for a same IDU in cool mode, the inlet temp will be 1~7°C(34~45°F) lower than the outlet Indoor heat temperature, and 4~9°C(39~48°F) higher...
Page 21: Unit Function Settings
Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 4 Unit Function Settings 4.1 DIP Switch Settings Code Name Meaning Default Setting Remarks Capacity DIP Defines the rated Depending on The DIP switch is set by the SA1_capacity switch capacity of the unit.
Page 22 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Address No. DIP1 DIP2 DIP3 DIP4 DIP5 × × × × × × × × × × × × Note: DIP switch at the ON end indicates 0; ①...
Page 23 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Names and Functions of the Buttons Button No. Code Function Selects the upper item. Down Selects the lower item. Confirm Confirms the selection. Back Returns to the previous operation.
Page 24 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual LED1 Function code Display status Blinks Press the SW1 up button and the SW2 down button on the unit to select the corresponding function/parameter: LED1 Function Name Function code...
Page 25 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Step 1: Enter A2 refrigerant recycle, and ensure that the outdoor unit displays as follows: LED1 Current process Display status Blinks Step 2: When the default value 01 is displayed, press the SW1 up button and the SW2 down button to select the corresponding recycle mode.
Page 26 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Step 1: Enter A6 cooling/heating setting of the entire system, and ensure that the outdoor unit displays as follows: LED1 Current process Display status Blinks Step 2: Press the SW1 up button and the SW2 down button to select the corresponding cooling/heating mode.
Page 27 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Silence Mode Code Mode 11 Mode 12 Mode 13 Note: After a silence mode is set, the system capability will be attenuated. Therefore, the noise and the capability need to be balanced when a silence mode is selected.
Page 28 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Press the SW4 back button on the master module to return to the previous process or exit the function setting status. The default status is 00, that is, no silence.
Page 29 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Step 2: Press the SW1 up button and the SW2 down button to select the corresponding mode. LED1 Current process/mode Display status Blinks Blinks Step 3: After selecting the mode, press the SW3 confirm button. The outdoor unit displays as follows:...
Page 30 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Setting steps: Step 1: Enter n4 maximum output capability limit setting, and ensure that the outdoor unit displays as follows: LED1 Current process/mode Display status 10 or 09 or 08 Blinks Step 2: Press the SW1 up button and the SW2 down button to select the corresponding value.
Page 31 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 4.2.3.9 C9 Fan Failure Emergency Operation This function is after-sales emergency setting when a fan on a dual-fan module works abnormally. It shields the abnormal fan in a short time to ensure the emergency operation of the system.
Page 32 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 4.2.4 Outdoor Unit Status Query The following functions can be queried: Function Code Function Name Fault query Parameter query Indoor unit engineering SN query Online indoor unit qty query...
Page 33 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual compressor driver module. Charging loop fault of the inverter compressor Four-way valve air backflow protection driver. Under voltage protection for DC bus of the High pressure low protection inverter outdoor fan driver...
Page 34 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual LED1 Function Code Display status Press the SW1 up button and the SW2 down button to select the corresponding query module, and press the SW3 confirm button. The unit displays as follows:...
Page 35 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Parameter Code Parameter Name Remarks — Outlet temperature of accumulator — Oil return temperature — Inlet pipe temperature of the condenser Outlet pipe temperature of the — condenser Note: If a parameter value is negative, LED1 circularly displays negative value code "nE"...
Page 36 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual minutes, the system will automatically exit the current screen and the unit will resume displaying the current status. 4.2.4.4 n9 Online Indoor Unit Qty Query Introduction: This function directly uses the outdoor unit to query the quantity of online indoor units.
Page 37 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Note: Un indicates the unit barcode, while Pc indicates the controller barcode. After confirming the module, press the SW1 up button and the SW2 down button to select the barcode sequence.
Page 38 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 4.4 Fire Alarm Function Setting The VRF unit system reserves a fire alarm interface "CN44", which connects with the external fire alarm system. In case of an external fire, the unit urgently shuts down for protection based on the received signal.
Page 39: Chapter 3 Faults
Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Chapter 3 Faults 1 Error Indication Error Error Content Content — Code Code Malfunction of IDU Protection of indoor fan Auxiliary heating protection Water-full protection Abnormal Power for wired controller...
Page 40 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Error Error Content Content — Code Code Malfunction of ODU High-pressure protection Discharge low-temperature protection Low-pressure protection High discharge temperature protection of Drive IPM low temperature protection compressor Main board of ODU is poor...
Page 41 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Error Error Content Content — Code Code Over-current protection of inverter Drive IPM module protection of compressor compressor Malfunction of drive temperature sensor of Drive IPM high temperature protection of...
Page 42 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Error Error Content Content — Code Code Communication malfunction between the Drive board of grid-connection is abnormal drive board of grid-connection and the main board Communication malfunction between IDU, PV module over-temperature protection ODU and IDU’s wired controller...
Page 43: Troubleshooting
Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2 Troubleshooting WARNING! When troubleshooting the modular units, make sure that all outdoor units are powered off and powered on at the same time. Avoid doing so to only some of the outdoor units.
Page 44 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual heating mode, the indoor fan will stop working for 5 to 10 minutes. Possible causes: -- Troubleshooting: not required. 2.5 "A6" Cooling and Heating Function Settings State Fault display: main board of outdoor unit displays Fault diagnosis: This is a status code.
Page 45 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual This is a status code. It indicates that the system has entered cooling mode. Possible causes: -- Troubleshooting: not required. 2.10 "AF" Fan State Fault display: main board of outdoor unit displays Fault diagnosis: This is a status code.
Page 46 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual display Fault diagnosis: This is a status code. It indicates that the unit is in emergency stop status through remote centralized control, and it cannot be started unless such state is disabled.
Page 47 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "b1" Outdoo r A mb ient Temperature Sen sor Fault Whether th e i nter face terminal between the main boa rd and Remove the foreign temperature sensor gets loose or...
Page 48 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "b2" Defrosting Temperature Sen sor 1 Fault Whether th e i nter face terminal between the main boa rd and Remove the foreign temperature sensor gets loose or matters and plug it tightly...
Page 49 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "b3" Defrosting Temperature Sen sor 2 Fault Whether th e i nter face terminal between the main boa rd and Remove the foreign temperature sensor gets loose or matters and plug it tightly...
Page 50 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "b4" Sub coo ler's Li quid Outlet Tempe ratu re Sensor Fault Whether th e i nter face terminal between the main boa rd and Remove the foreign matters and plug it tightly...
Page 51 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "b5" Sub coo ler's G as Outlet Tempe ratu re Sensor Fault Whether th e i nter face terminal between the main boa rd and Remove the foreign temperature sensor gets loose or...
Page 52 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "b6" Suction Te mp erature Sen sor 1 Fault Whether th e i nter face terminal between the main boa rd and Remove the foreign temperature sensor gets loose or...
Page 53 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "b7" Suction Te mp erature Sen sor 2 Fault Whether th e i nter face terminal between the main boa rd and Remove the foreign temperature sensor gets loose or...
Page 54 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "b8" Outdoo r Humidity Sen sor Fault Whether th e i nter face terminal between the main boa rd and Remove the foreign temperature sensor gets loose or matters and plug it tightly...
Page 55 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "b9" Heat E xchang er's G as Outlet Tempe ratu re Sensor Fault Whether th e i nter face terminal between the main boa rd and Remove the foreign...
Page 56 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "bA" Oil Return Temperature Sen sor Fault Whether th e i nter face terminal between the main boa rd and Remove the foreign temperature sensor gets loose or matters and plug it tightly...
Page 57 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual “bd” subcooler air inlet temperature sensor error Check the terminal between main If it is loosened or there are board and temperature sensor to see if i t is loose or any...
Page 58 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value. If the sampling AD value exceeds upper limit and lower limit in 30 seconds...
Page 59 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "C0" Communication Fault Between Indoor and Outdoor Units and Between Indoor Unit and Wired Controller Whether the communication cables between the main control board of the Connect the communication...
Page 60 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual ■ The main board operates improperly. Troubleshooting: "C2" Communication Fault Between the Primary Controller and Inverter Compressor Driver Whether the communication cables between the main board of outdoor Connect the communication...
Page 61 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "C3" Communication Fault Between the Primary Controller and Inverter Fan Driver Whether the communication cables between the main board of outdoor Connect the communication unit and inverter fan drive board...
Page 62 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "C4" Indoor Unit Loss Fault Whether all the indoor Power on the units units are energized? Whether the communication cables of disconnected indoor units Connect the communication (in this case the disconnected cables properly indoor units display "C0") are...
Page 63 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual display Fault diagnosis: The unit detects the number of online outdoor modules in real time. When it detects that the number of current modules is inconsistent with the number of modules previously commissioned and memorized, the unit will report the fault and stop working.
Page 64 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual indicating that the unit's fan has entered emergency operation. Possible causes: -- Troubleshooting: not required. 2.38 "CA" Emergency Operation of Module Fault display: main board of outdoor unit displays...
Page 65 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.41 "CJ" System Address Code Conflict Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: When multiple refrigerant systems are connected through the CAN2 network of the unit's main board, only one primary system is allowed in the network.
Page 66 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.42 "CP" Fault of Multiple Main Wired Controllers Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: Two or more wired controllers in an HBS network are main wired controllers.
Page 67 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "Cb" IP A ddress Assignment O ver flow Is th e p roblem so lve d afte r the indoo r a nd outdoor units are power ed o ff a nd powered...
Page 68 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Troubleshooting: “d2” water tank temperature sensor error Is the terminal between If it is loosened or there are mainboard and water tank foreign objects, retighten it temperature sensor loose or any...
Page 69 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "d3" Ambien t Temp erature Sen sor Fault Whether th e i nter face terminal between the main boa rd Remove the foreign and ambie nt temperature sensor g ets loose...
Page 70 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "d4" Inlet Pi pe Tempe ratu re Sen sor Fault Whether th e i nter face terminal between the main boa rd Remove the foreign and inl et pipe temperature sensor gets loose...
Page 71 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "d6" Outlet P ipe Temperature Sen sor Fault Whether th e i nter face terminal between the main boa rd and outlet Remove the foreign pipe temperature sensor gets loose or...
Page 72 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "d7" Humidity Sen sor Fault Whether th e i nter face terminal between the main boa rd Remove the foreign and hu mid ity sen sor gets lo ose or...
Page 73 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "d9" Jumper Ca p Fau lt Whether th e j ump er cap is proper ly Install the jumper ca p installed at the jump silk screen on the...
Page 74 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.54 "dH" Abnormal Circuit Board of Wired Controller Fault display: wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The wired controller's IIC communication is abnormal.
Page 75 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "dC" Abn ormal Setting s of DIP Switch for Ca pacity Whether th e DIP switch for capacity on th e main bo ard is dial ed Redial the DIP switch...
Page 76 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.57 "dE" Indoor CO2 Sensor Fault (Reserved) 2.58 “dF” Temperature Sensor Error Error display: hydro box wired controller will display Applicable mode: all hydro boxes Error judgment condition and method: Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value.
Page 77 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual “dJ” water return temperature sensor error Is the terminal between If it is loosened or there are Mainboard and water return temperature forei g n objects, retighten it sensor loose or any foreign objects...
Page 78 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 1) Sample the AD value of temperature sensor through temperature sensor detecting circuit and judge the range of AD value. If the sampling AD value exceeds upper limit and lower limit in 5 seconds...
Page 79 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual ■Temperature sensor is abnormal ■Detecting circuit is abnormal Troubleshooting: “dd” solar energy temperature sensor error Is the terminal between If it is loosened or there are main board and solar energy water...
Page 80 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual “dn” swing assy error Check the terminal between If it is loosened or there are main board and limit switch to see if it is forei g n objects, retighten it after...
Page 81 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual E1 System Overpressure Pro tection Whether the high pressure of the unit Replace th e main bo ard of Whether th e h igh pressu re (measured by the external...
Page 82 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.66 "E2" Protection in Case of Too Low Air Discharge Temperature of Compressor Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit...
Page 83 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual able to reset the unit normally, inspect other parts of the unit. Step 4: Check whether the refrigerant is added in accordance with the design requirements, as excessive refrigerant may trigger system protection.
Page 84 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "E3" System Low Pressure Protection Does the low A fault occurs in the low pressure (measured by the pressure sensor. pressure gauge) reach the Replace the pressure sensor protection value?
Page 85 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.68 "E4" Protection in Case of Too High Air Discharge Temperature of Compressor Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit...
Page 86 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.69 “Ed” Low Drive Module Temperature Protection Error display: ODU main board, IDU wired controller and IDU receive light board will display Applicable model: GMV6 series Error judgment condition and method: Test module temperature through the internal sensor of IPM module, when the test value is below outdoor ambient temperature, the system will stop for protection.
Page 87 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "F0" Poo r Main Bo ard of the Outdoor Unit Whether syste m clock exce ptio n Replace th e CPU is a lso gen erated (check by u sin g the...
Page 88 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.71 "F1" High-pressure Sensor Fault Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The sensor detection circuit samples the AD value of high pressure sensor and determines the range of AD value.
Page 89 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.72 "F3" Low Pressure Sensor Fault Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The sensor detection circuit samples the AD value of low pressure sensor and determines the range of AD value.
Page 90 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.73 "F5" Discharge Temperature Sensor Fault of Compressor Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The temperature sensor detection circuit samples the AD value of temperature sensor and determines the range of AD value.
Page 91 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.74 "F6" Discharge Temperature Sensor Fault of Compressor Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The temperature sensor detection circuit samples the AD value of temperature sensor and determines the range of AD value.
Page 92 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.75 "F7" Discharge Temperature Sensor Fault of Compressor Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The temperature sensor detection circuit samples the AD value of temperature sensor and determines the range of AD value.
Page 93 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.76 "F8" Discharge Temperature Sensor Fault of Compressor Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The temperature sensor detection circuit samples the AD value of temperature sensor and determines the range of AD value.
Page 94 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.77 "F9" Discharge Temperature Sensor Fault of Compressor Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The temperature sensor detection circuit samples the AD value of temperature sensor and determines the range of AD value.
Page 95 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.78 "FA" Discharge Temperature Sensor Fault of Compressor Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The temperature sensor detection circuit samples the AD value of temperature sensor and determines the range of AD value.
Page 96 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.79 "FH" Abnormal Current Sensor of Compressor 1 Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The circuit detection circuit samples the AD value and determines the range of AD value. When the sampled AD value exceeds the limits for 3 consecutive seconds, the fault is generated.
Page 97 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.80 "FC" Abnormal Current Sensor of Compressor 2 Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The circuit detection circuit samples the AD value and determines the range of AD value. When the sampled AD value exceeds the limits for 3 consecutive seconds, the fault is generated.
Page 98 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.81 "FL" Abnormal Current Sensor of Compressor 3 Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The circuit detection circuit samples the AD value and determines the range of AD value. When the sampled AD value exceeds the limits for 3 consecutive seconds, the fault is generated.
Page 99 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.82 "FE" Abnormal Current Sensor of Compressor 4 Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The circuit detection circuit samples the AD value and determines the range of AD value. When the sampled AD value exceeds the limits for 3 consecutive seconds, the fault is generated.
Page 100 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.83 "FF" Abnormal Current Sensor of Compressor 5 Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The circuit detection circuit samples the AD value and determines the range of AD value. When the sampled AD value exceeds the limits for 3 consecutive seconds, the fault is generated.
Page 101 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.84 "FJ" Abnormal Current Sensor of Compressor 6 Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The circuit detection circuit samples the AD value and determines the range of AD value. When the sampled AD value exceeds the limits for 3 consecutive seconds, the fault is generated.
Page 102 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.85 "FU" Shell Roof Temperature Sensor Fault of Compressor 1 Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The temperature sensor detection circuit samples the AD value of temperature sensor and determines the range of AD value.
Page 103 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.86 "Fb" Shell Roof Temperature Sensor Fault of Compressor Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The temperature sensor detection circuit samples the AD value of temperature sensor and determines the range of AD value.
Page 104 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.87 "H0" Fan Drive Board Fault Fault display: wired controller of indoor unit displays Fault diagnosis: Check the fault code displayed on the wired controller of the indoor unit. If the wired controller displays HO, check the fault code displayed on the 2-digit digital LED of the main control board of the outdoor unit, based on which you are able to identify the specific fault of the fan drive board.
Page 105 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual ■ Inverter fan over-current protection (2-digit digital LED of the main control board of the outdoor unit displays H5); ■ Communication fault of fan drive (2-digit digital LED of the main control board of the outdoor unit displays C3).
Page 106 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.90 "H3" Reset Protection for the Fan Drive Module Fault display: wired controller of indoor unit displays Fault diagnosis: If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is H3, it indicates the reset protection for the fan drive board.
Page 107 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.91 "H5" Inverter Fan Over-current Protection Fault display: main board of outdoor unit displays Fault diagnosis: If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is H5, it indicates the over-current protection for the inverter fan.
Page 108 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.92 "H6" IPM Module Protection for Fan Drive Fault display: main board of outdoor unit displays Fault diagnosis: If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is H6, it indicates the IPM module protection for the fan drive.
Page 109 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.93 "H7" Temperature Sensor Fault of Fan Drive Fault display: main board of outdoor unit displays Fault diagnosis: If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is H7, it indicates the temperature sensor fault for the fan drive.
Page 110 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.94 "H8" IPM Over Temperature Protection for Fan Drive Fault display: main board of outdoor unit displays Fault diagnosis: If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is H8, it indicates the IPM over temperature protection for the fan drive.
Page 111 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.95 "H9" Loss of Synchronization Protection for Inverter Fan Fault display: main board of outdoor unit displays Fault diagnosis: If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is H9, it indicates the loss of synchronization protection for the inverter fan.
Page 112 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.96 "HC" Current Detection Circuit Fault of Fan Drive Fault display: main board of outdoor unit displays Fault diagnosis: If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is HC, it indicates the current detection circuit fault of fan drive.
Page 113 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "HH" Over Voltage Pro tection for the DC Bus of Fan Drive Whether th e i nput voltage of the unit Chang e the volta ge to exceeds 460V?
Page 114 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.99 "HJ" Inverter Fan Startup Failure Fault display: main board of outdoor unit displays Fault diagnosis: If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is HJ, it indicates the inverter fan startup failure.
Page 115 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.100 "J0" Protection for Other Modules Fault display: main board of outdoor unit displays while the indoor unit and receiver of indoor unit do not. Applicable models: GMV6, GMV5, GMV5S, TOPS, GMV water Series...
Page 116 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "J1" Compressor 1 Over-current Protection Power on aga in the units based on th e capa city and nu mb er o f indoo r u nits enable d...
Page 117 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.102 "J2" Compressor 2 Over-current Protection Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: When the operating current of the compressor detected by the current sensor or circuit exceeds the limit, the unit will stop working.
Page 118 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.103 "J3" Compressor 3 Over-current Protection Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: When the operating current of the compressor detected by the current sensor or circuit exceeds the limit, the unit will stop working.
Page 119 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.104 "J4" Compressor 4 Over-current Protection Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: When the operating current of the compressor detected by the current sensor or circuit exceeds the limit, the unit will stop working.
Page 120 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.105 "J5" Compressor 5 Over-current Protection Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: When the operating current of the compressor detected by the current sensor or circuit exceeds the limit, the unit will stop working.
Page 121 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.106 "J6" Compressor 6 Over-current Protection Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: When the operating current of the compressor detected by the current sensor or circuit exceeds the limit, the unit will stop working.
Page 122 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.107 "J7" Four-way Valve Air Backflow Protection Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: When the difference between the system high pressure and low pressure during operation detected by the pressure sensor is less than 0.1 MPa, the unit will stop running to ensure safe operation.
Page 123 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "J7" Four-way Va lve Air Backflo w Protection Whether th e four-way valve Conne ct them prope rly and coil is connected to the ma in relia bly boa rd p roperl y?
Page 124 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.108 "J8" High Pressure Ratio Protection Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: When the ratio between the system high pressure and the low pressure during operation detected by the pressure sensor exceeds 8, the unit will stop running to ensure safe operation.
Page 125 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.109 "J9" Low Pressure Ratio Protection Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: When the ratio between the system high pressure and the low pressure during operation detected by the pressure sensor is smaller than 1.8, the unit will stop running to ensure safe operation.
Page 126 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual NOTES! If the enquired IDU is normal, no fault code will be displayed in the temperature area; if the ① unit indoor has multiple faults, fault codes will be displayed in the temperature area at an interval of 3 seconds.
Page 127 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.111 "L1" Indoor Fan Protection Fault display: wired controller of indoor unit and receiver of indoor unit display Applicable models: all indoor units Fault diagnosis: Check whether the indoor unit rotates slowly or stops or whether there exists external fan protection signal.
Page 128 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "L1" Indoor Fan Protectio n Is th e type of motor o f th e faulty indo or u nit DC motor, AC mo tor or PG motor? For a DC motor or a PG mo tor, the low speed of mo tor would trigger pro tection.
Page 129 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.112 "L2" E-heater Protection (Reserved Code, Not Yet Applied) 2.113 "L3" Overflow Protection Fault display: wired controller of indoor unit and receiver of indoor unit display Applicable models: all indoor units Fault diagnosis: When the water level is too high, the float switch of indoor unit will be triggered for overflow protection.
Page 130 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.114 "L4" Supply Power Over-current Protection Fault display: wired controller of indoor unit and receiver of indoor unit display Applicable models: all indoor units Fault diagnosis: When the current supplied to the wired controller by the indoor unit is too large, the fault is generated.
Page 131 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.115 "L5" Antifreeze Protection Fault display: wired controller of indoor unit and receiver of indoor unit display Applicable models: all indoor units Fault diagnosis: When the pipe temperature of the indoor unit is too low, the unit will trigger antifreeze protection to prevent the evaporator from freezing.
Page 132 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.116 "L6" Mode Conflict (Reserved) 2.117 "L7" No Master Indoor Unit Fault display: wired controller of indoor unit and receiver of indoor unit display Applicable models: all indoor units Fault diagnosis: The unit triggers the "no master indoor unit"...
Page 133 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.118 "L9" Inconsistent Number of Indoor Units Under Integrated Control Fault display: wired controller of indoor unit and receiver of indoor unit display Applicable models: all indoor units Fault diagnosis:...
Page 134 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.120 "LH" Poor Air Quality Alarm (Reserved Code, Not Yet Applied) 2.121 "LC" Unmatched Models of Indoor and Outdoor Units Fault display: wired controller of indoor unit and receiver of indoor unit display...
Page 135 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual “LL” waterflow switch error Is the terminal between If it is loosened or there Mainboard and water flow switch loose are foreign objects, or any foreign objects inside? retighten it after treatment...
Page 136 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.124 “LU” Inconsistent IDU Branch Connecting to the Wired Controller Which Controls Multiple Indoor Units of Heat Recovery System Error display: wired controller will display Applicable model: wired controller connecting to several IDUs...
Page 137 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual “Ln” lifting panel return air frame reset is abnormal Is the terminal between If it is loosened or there main board and limit switch loose or are foreign objects,...
Page 138 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.128 "n4" Settings Status of Maximum Output Capacity Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: This is a status code of a function. It indicates that the unit has entered settings status of maximum output capacity.
Page 139 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.132 "n9" Status of Querying Number of Online Indoor Units Fault display: main board of outdoor unit displays Fault diagnosis: The code is a query status code, in which case you can query the number of online indoor units.
Page 140 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.137 "nF" Fan Type Unit Fault display: main board of outdoor unit displays Fault diagnosis: The code indicates that the indoor unit only operates in fan mode. Possible causes: -- Troubleshooting: not required.
Page 141 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual “o3” IDU IPM module protection Check if the contact of U, V and W wire of indoor fan is good Check is the resistance among winding of each indoor fan phase equal? Is the insulation...
Page 142 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual “o7” IDU non-synchroni s m protection Check if the contact of U, V and W wire of indoor fan is good Check is the resistance among winding of each indoor fan phase equal? Is the insulation...
Page 143 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual “o8” IDU drive communication error Check the terminal between If it is loosened or external drive board and main control there are foreign board to see if it is loose or any...
Page 144 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual “o9” IDU main control communication error Check the terminal between main If it is loosened or there are board and external drive board to see if it is foreign objects, retighten it...
Page 145 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.143 "P1" Malfunctioning Compressor Drive Board Fault display: wired controller of indoor unit displays Fault diagnosis: If the fault code displayed on the wired controller of the indoor unit is P1, check the fault code displayed on the 2-digit digital LED of the main control board of the outdoor unit, based on which you are able to identify the specific fault of the compressor drive board.
Page 146 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Troubleshooting: "P3" Reset Protection for the Compr essor Drive Module Is th e p roblem so lve d after the unit is powered off and powere d o n...
Page 147 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "P5" Inve rte r Compressor Over-current Protection Whether th e U, V and W pha ses of compressor wire s are connected prope rly? Whether the resistance between the windings of each phase for the...
Page 148 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.147 "P6" IPM Module Protection for the Compressor Drive Fault display: main board of outdoor unit displays Fault diagnosis: If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is P6, it indicates the IPM module protection for the compressor drive.
Page 149 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.148 "P7" Abnormal Temperature Sensor of Compressor Drive Board Fault display: main board of outdoor unit displays Fault diagnosis: If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is P7, it indicates the abnormal temperature sensor of compressor drive board.
Page 150 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "P8" IPM Over Temperature Pro tection for the Compressor Drive Boar d Check whether th e screws are Whether over-temperature tightened and whether the IPM protection of IPM modul e is trig gered...
Page 151 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "P9" Loss of Synchroni zation Pro tection for the Inverte r Compressor Whether th e U, V and W pha ses of compressor wire s are connected prope rly?
Page 152 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.151 "PC" Current Detection Circuit Fault of Compressor Drive Fault display: main board of outdoor unit displays Fault diagnosis: If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is PC, it indicates the current detection circuit fault of compressor drive.
Page 153 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "PH" Over Voltage Pro tection for the DC Bus of Compre ssor Drive r Whether th e i nput voltage of the Chang e the volta ge to unit excee ds 460V?
Page 154 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is PJ, it indicates the inverter compressor startup failure. Possible causes: ■ Poor contact of compressor's UVW cables;...
Page 155 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.155 "U0" Insufficient Warm-up Time for Compressor Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: When the oil preheating period of time before compressor starts is less than eight hours, the unit generates a fault.
Page 156 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.156 "U3" Power Phase-Sequence Protection Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: Check the three-phase power of the unit. If the power is connected incorrectly, thereby causing phase loss or reverse phase, the unit generates a fault.
Page 157 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "U4" Refrigerant Loss Protection Whether the refrigerant is added in accordance with the design requirements? Check and troubleshoot the leaks of pipes 2.158 "U6" Abnormal Valve Prompt Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit...
Page 158 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual "U8" Abnormal Pipes of the Indoor Unit Power on the units based on the capacity and number of indoor units enabled previously in the case of protection state. After...
Page 159 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.161 "UC" Master Indoor Unit Set Successfully Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit display Fault diagnosis: The code indicates the state of the unit rather than the fault. During the commissioning process, the unit prompts that the master indoor unit is already set successfully.
Page 160 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Troubleshooting: Step 1: replace mode exchanger main board to see if the error is solved; Step 2: if UF error still exists after replacing mode exchanger main board, disconnect the communication connection of all IDUs and mode exchangers, connect the IDU communication cord one by one to the communication board of mode exchanger until all the IDUs which have triggered the UF error are tested;...
Page 161 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual After turning on the IFD for 60s, start the error feedback test, if the IFU feedback tested in 5 consecutive seconds is low level, it’s deemed that IFD is faulted.
Page 162 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual “y8” indoor air box sensor general error Check if the monitor software displays air box and the test data Check if the communication cord between main control board and air box...
Page 163 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual ■ The unit operates out of the range of required ambient temperature. ■ Airflow organization is set ineffectively. ■ The amount of refrigerant is insufficient. Troubleshooting: Ineffective Coolin g a nd...
Page 164 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 2.169 No Faults Displayed But Compressor Not Starting in Cooling/Heating Mode Error display: no error displayed but compressor not starting in cooling / heating mode Applicable model: all ODUs...
Page 165: Non-Fault Type Troubleshooting
If an abnormal situation (such as peculiar smell) occurs, please stop the operation immediately and turn off the main power supply, and then contact Gree authorized maintenance center. If the unit continues to operate under abnormal situation, the air conditioner will be damaged and an electric shock or fire accident may result.
Page 166 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Phenomenon Causes When the system is started or stopped for a short time, you can hear the sound of “sa——”; you can also This is the sound produced when the hear this sound for a short time after refrigerant stops or changes the flow.
Page 167 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Phenomenon Causes During cold weather heating operation, when Wired controller displays frost or ice may form on the outdoor unit heat Unit enters frost mode operation A3 code exchanger, the unit will automatically enter the defrost mode for a few minutes.
Page 168: Chapter 4 Maintenance
Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Chapter 4 Maintenance WARNING! During the maintenance of a modular unit, all the outside units must be powered on and off concurrently. Avoid doing so to only some of the outdoor units.
Page 169 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual needs to be charged with additional refrigerant. (2) Confirm whether outdoor liquid and gas valves are closed. (3) Use vacuum pump to withdraw the air inside indoor unit and connection pipe from the outdoor valve, as shown in Fig.4.5.1 below.
Page 170 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Record the amount of refrigerant added to facilitate after-sales maintenance. After ensuring that the system does not leak and the compressor is not working, first charge the specified amount of R410A into the unit from the injection port of the outdoor unit liquid pipe valve until the required amount is reached.
Page 171: Inspection Of Key Parts
Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 3 Inspection of Key Parts 3.1 Power Specifications Description The power supplies of the compressor and fan comprise the following three parts: ① The specifications of the input power are 208/230V ~ 60Hz and earth Use of power to the main control board: line.
Page 172 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Specifications Description The power supplies of the compressor and fan comprise the following three parts: ① The specifications of the input power are 208/230V ~ 60Hz and earth Use of power to the main control board: line.
Page 173 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 3.1.1 Mechanical Inspection (1) Confirm that the unit power is disconnected. (2) Remove the electrical appliance cover. (3) Check whether the power cable is fixed on the wiring board.
Page 174 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 3.2 Temperature Sensors Specifications Description Three types of temperature sensors of different specifications are The sensors are used to measure the temperature of the unit at different positions. used, including 50K, 20K and 15K.
Page 175 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 3.2.1 Mechanical Inspection (1) Confirm that the unit Power is disconnected. (2) Find the place corresponding to each sensor on the unit and check if the sensors are firmly fixed on the unit.
Page 176 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 15K temperature sensor resistance - temperature curve Temperatur Resistanc e\°C e\KΩ 108.7 82.75 63.46 49.02 38.15 29.9 23.6 18.75 12.07 9.779 7.967 6.529 5.379 4.456 3.711 3.105 2.611 2.205 1.871...
Page 177 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 20K temperature sensor resistance - temperature curve Temperatu Resistanc re\°C e\KΩ 361.8 265.5 196.9 110.3 84.61 65.37 50.87 39.87 31.47 25.01 16.1 13.04 10.62 8.705 7.173 5.942 4.948 4.14 3.481...
Page 178 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 50K temperature sensor resistance - temperature curve Temperatur Resistanc e\°C e\KΩ 911.56 660.93 486.55 362.99 274.02 209.05 161.02 126.17 98.006 77.349 61.478 49.191 39.61 32.088 26.147 21.425 17.651 14.618 12.168...
Page 179 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 3.3 Solenoid Valve Specifications Description The 4-way valve is used to switch between cooling mode and heating mode. If the 4-way valve is active, the ① Coils of different types are used on: unit works in heating mode, if the 4-way valve is inactive, the unit works in cooling mode.
Page 180 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 3.3.1 Mechanical Inspection (1) Confirm that the unit Power is disconnected. (2) Find the 4-way valve or solenoid valve, check whether the fixing screw is loose and whether the valve and coil have any apparent exceptions.
Page 181 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 3.4 Electronic Expansion Valve Specifications Description The electronic expansion valve with the largest openness of 480 pls and 5-core coil. The electronic expansion valve is used to control the flow. When the electronic expansion valve is closed (the openness is 0 pls), the flow is stopped.
Page 182 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 3.4.1 Mechanical Inspection Step 1: Switch off the power of the ODU. Step 2: Check whether the coil of the electronic expansion valve is firmly fixed on the electronic expansion valve.
Page 183 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 3.5 Fans Specifications Description The fans are powered by a DC inverter motor and can adjust the speed automatically The unit is equipped with two fans. The fans are connected to the main control board.
Page 184 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 3.5.1 Mechanical Inspection Step 1: Switch off the power of the ODU. Step 2: Check whether the connector between the fan motor and fan drive board is firmly connected.
Page 185 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 3.6 Compressor Specifications Description Models: QXAT-F400zN450 Compression refrigerant, recycling refrigerant. Models: GMV-V36WL/C-T(U)、GMV-V46WL/C-T(U)、GMV-V60WL/C-T(U) Circuit diagram Physical position...
Page 186 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 3.6.1 Diagnosis of Compressor Failures 3.6.1.1 When the unit can be started Step 1: If the unit can be started, check the faulty compressor's line current. Use a pressure gauge to measure the gas and liquid valve pressure and monitor the measured data on a PC.
Page 187 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Electronic expansion valve: When the unit is powered on and off each time, the electronic expansion valve needs to reset. Touch the valve with a hand to check if the valve core rotates.
Page 188 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 4-way valve: When it is normal, the temperature different between it and the four copper tubes connecting to the valve is obvious. When the 4-way valve works, obvious sound and vibration can be heard and felt.
Page 189 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual and conducting oil return, the 4-way valve produces obvious valve pushing sound. Do not touch the pipeline with hands. Otherwise, you may get scalded. Oil-return solenoid valve: It can be diagnosed based on the oil-return valve status displayed on the monitor program and the actual operation.
Page 190 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 3: Point the black probe to the P needle file and the red probe to the V wiring terminal. In the normal condition, the multimeter will not beep. If it does, the drive board is damaged and needs to be replaced.
Page 191 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Measure the grounding resistance of each wiring terminal, which should be greater than 10 MΩ; otherwise, the compressor has an internal fault. Step 3: When the unit cannot be started properly, the solenoid valves of the system, including the electronic expansion valve and oil-return valve, need to be checked using the same method described above.
Page 192 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 3.7 Board 3.7.1 Main Board The main board is used to control the load of the ODU. Models: GMV-V60WL/C-T(U)、GMV-V48WL/C-T(U)、GMV-V36WL/C-T(U) Circuit diagram Layout of electrical appliance box Physical position...
Page 193 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Step 1: Disconnect the power and wait five minutes. Step 2: As shown in the figure, switch the multimeter to the diode gear. Point the black and red probes to the following positions to check if the main board is normal.
Page 194 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 3.7.2 Compressor Drive Specifications Description This part is used to control the operation of the compressor. － Models: GMV-V60WL/C-T(U)、GMV-V48WL/C-T(U)、GMV-V36WL/C-T(U) Circuit diagram Layout of electrical appliance box Physical position...
Page 195 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual (1) Before the inspection: Find a correct digital multimeter and switch it to the diode gear. Power off the unit and wait two minutes. Disconnect the U, V and W cables of the compressor and N and AC-L power cables from the main board. Do not operate without waiting two minutes after the unit is powered off.
Page 196 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 3.7.3 Fan Drive Specifications Description This part is used to control the operation of the fan. － Models: GMV-V60WL/C-T(U)、GMV-V48WL/C-T(U)、GMV-V36WL/C-T(U) Circuit diagram Layout of electrical appliance box Physical position...
Page 197 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 1. Upper Fan Inspection (1)Before the inspection: Find a correct digital multimeter and switch it to the diode gear. Power off the unit and wait two minutes. Disconnect the U1, V1 and W1 cables of the fans from the drive board.
Page 198 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 3.8 Pressure Sensor Specifications Description Inspection of high-pressure temperature of the high-pressure sensor: 1. Control of compressor output capacity 2. Conversion and calculation of saturated condensing temperature 3. Protection high pressure 4.
Page 199 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Inspection procedure Preparations (1) Use the wired controller or remote controller to shut down the unit. (2) Remove the front cover and open the electrical appliance box. Inspection of low-pressure sensor (1) Connect the pressure gauge to the gas valve and check if the gas and liquid valves are open.
Page 200: Replacement Of Key Unit Parts
Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 4 Replacement of Key Unit Parts 4.1 Key Parts Photo Name Function Core part of air conditioning system. It sucks low temperature and low pressure gas, compress it to...
Page 201 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Photo Name Function High pressure It used for storing the superfluous high pressure liquid refrigerant liquid during cooling process. storage tank Solenoid — valve It used for connecting indoor unit and outdoor unit, Cut-off valve and used for maintenance and installation.
Page 202 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 4.2 Removal of Key Parts Removal operation for panel Remark: Before removing the panel, please make sure that the unit is disconnected with the power Process Photo Operation Instruction ●...
Page 203 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Removal operation for blade Remark: Before removing the motor, please make sure that the unit is disconnected with the power. Process Photo Operation Instruction ● Loose screws fixing the panel 1.Remove grille...
Page 204 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Removal operation for blade Remark: Before removing the motor, please make sure that the unit is disconnected with the power. Process Photo Operation Instruction ● Assemble the unit in the the 5.Assemble unit...
Page 205 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Removal operation of compressor Remark: Before removing the compressor, please make sure that there’s no refrigerant inside the pipeline and the power is disconnected. Process Photo Operation Instruction ● Take out the compressor and 4.Remove the...
Page 206 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Removal operation of compressor Remark: Before removing the compressor, please make sure that there’s no refrigerant inside the pipeline and the power is disconnected. Process Photo Operation Instruction ●Check whether the pipeline is connected well ●Check whether all parts and...
Page 207 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Removal operation for 4-way valve Remark: Before removing the 4-way valve, please make sure that there’s no refrigerant inside the pipeline of system and then power is disconnected. Process...
Page 208 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Removal operation for electronic expansion valve Remark: Before removing the electronic expansion valve, please make sure that there’s no refrigerant in the pipeline of system and the power is disconnected...
Page 209 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Removal operation of gas liquid separator Remark: Before removing the gas liquid separator, please make sure that there’s no refrigerant inside the pipeline of system and disconnect the power...
Page 210 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Removal operation for plate heat exchanger Remark: Before removing the plate heat exchanger, please make sure that there’s no refrigerant inside the pipeline of system and disconnect the power...
Page 211: Explosive View And Parts List
Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual 5 Explosive View and Parts List GMV-V36WL/C-T(U), GMV-V48WL/C-T(U) and GMV-V60WL/C-T(U) Parts list of GMV-V36WL/C-T(U), GMV-V48WL/C-T(U) and GMV-V60WL/C-T(U) Name Material code Coping 012049060098P Left Side Plate 012055060285P Brushless DC Motor...
Page 212 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Name Material code Pressure Sensor 430044060023 Connection Board 012077060725P Electric Box Assy 100002078277 Terminal Board 42200006005403 Terminal Board 42200006001201 Main Board 300027063015 Radiator 43003406008701 Filter Board 300020060111 Strainer 035021060019...
Page 213: Appendixes
Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Appendixes Appendix 1 Temperature Senor Resistance and Temperature Relationship Table Environmental temperature sensor 15kΩ resistance ~ voltage correspondence table (including outdoor and indoor environment temperature sensors) Temperature Resistance Temperature...
Page 214 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Temperature Resistance Temperature Resistance Voltage (V) Voltage (V) (°C) (kΩ) (°C) (kΩ) 21.51 1.356 0.802 3.133 20.54 1.393 0.779 3.137 19.63 1.429 0.758 3.141 18.75 1.467 0.737 3.145 17.93 1.503...
Page 215 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Temperature Resistance Temperature Resistance Voltage (V) Voltage (V) (°C) (kΩ) (°C) (kΩ) 3.333 0.254 3.245 3.217 2.717 0.248 3.246 3.105 2.734 0.243 3.247 2.998 2.75 0.237 3.249 2.898 2.766 0.232...
Page 216 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Temperature Resistance Temperature Resistance Voltage (V) Voltage (V) (°C) (kΩ) (°C) (kΩ) 62.13 0.804 1.47 3.074 59.08 0.835 1.427 3.08 56.19 0.866 1.386 3.086 53.46 0.898 1.346 3.092 50.87 0.931...
Page 217 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Temperature Resistance Temperature Resistance Voltage (V) Voltage (V) (°C) (kΩ) (°C) (kΩ) 8.37 2.326 0.4394 3.229 8.051 2.353 0.4289 3.231 7.745 2.379 0.4187 3.232 7.453 2.404 0.4088 3.234 7.173 2.429...
Page 218 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Temperature Resistance Temperature Resistance Voltage (V) Voltage (V) (°C) (kΩ) (°C) (kΩ) 274.02 0.116 5.9336 2.071 259.37 0.123 5.7457 2.096 245.61 0.129 5.5647 2.12 232.67 0.136 5.3903 2.144 220.5 0.143...
Page 219 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Temperature Resistance Temperature Resistance Voltage (V) Voltage (V) (°C) (kΩ) (°C) (kΩ) 32.088 0.784 1.6402 2.835 30.787 0.809 1.5996 2.845 29.544 0.835 1.5602 2.855 28.359 0.86 1.522 2.864 27.227 0.886...
Page 220: Appendix 2 Refrigerant Temperature And Pressure Table
Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Appendix 2 Refrigerant Temperature and Pressure Table Refrigerant: R410A Corresponding Corresponding Corresponding Temperature Temperature Temperature saturation saturation saturation (°C) (°C) (°C) pressure (BAR) pressure (BAR) pressure (BAR) 1.54 5.96 16.4...
Page 221: Appendix 3 Pressure Sensor Voltage And Pressure Table
Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Appendix 3 Pressure Sensor Voltage and Pressure Table High-pressure sensor features (R410A) Temperature Absolute pressure Temperature Absolute pressure Voltage (V) Voltage (V) (°C) (kPA) (°C) (kPA) 0.102 1300 0.111 1337 1.34...
Page 222 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Temperature Absolute pressure Temperature Absolute pressure Voltage (V) Voltage (V) (°C) (kPA) (°C) (kPA) 0.745 3450 3.592 0.772 3528 3.675 0.799 3606 3.759 0.828 3686 3.844 0.857 3767 3.93 0.887...
Page 223 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Temperature Absolute pressure Temperature Absolute pressure Voltage (V) Voltage (V) (°C) (kPA) (°C) (kPA) 0.577 1125 2.547 0.589 1159 2.615 0.605 1193 2.683 0.619 1228 2.753 0.633 1263 2.823 0.649...
Page 224: Appendix 4 Electric Specifications
Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Appendix 4 Electric Specifications All electrical installation must be performed by qualified technicians in accordance with local laws, regulations and this user manual. Use air conditioner specialized power supply and make sure that it is consistent with system’s rated voltage.
Page 225 Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Electrical Parameters： Maximum Over- Minimum Circuit Fuse Capacity Current Protection Ampacity Model Power Supply 208/230V-1Ph-60Hz 33.8 GMV-V36WL/C-T(U) 208/230V-1Ph-60Hz 38.8 GMV-V48WL/C-T(U) 208/230V-1Ph-60Hz 38.8 GMV-V60WL/C-T(U) Engineering Wiring of Power Supply and Communication Cable：...
Page 226: Appendix 5 Circuit Diagram
Gree Ultra Heat GMV6 Mini DC Inverter VRF Units Service Manual Appendix 5 Circuit Diagram GMV-V36WL/C-T(U)、GMV-V48/C-T(U)、GMV-V60WL/C-T(U) Note: Refer to the mark on the unit for the actual circuit diagram.
Page 227: Appendix 6 Schematic Diagram
Gree GMV6 DC Inverter VRF Units Service Manual Appendix 6 Schematic Diagram The working principle of Ultra Heat GMV6 Mini is as follows: when the indoor unit is running in the cooling mode, the outdoor unit starts the outdoor module according to the running load demand of the indoor unit.
Page 228: Appendix 7 Names And Functions Of Components
Gree GMV6 DC Inverter VRF Units Service Manual Appendix 7 Names and Functions of Components Name Main Functions The compressor changes its speed according to the actual system need for Compressor capacity adjustment. In the standby state, the oil temperature of the compressor is guaranteed to Crankcase heater prevent backflow.
Page 229 JF00305377...

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Gmv-v48wl/c-t u Gmv-v60wl/c-t u Cn851w4090 Cn850w1220 Cn850w1210

Gree GMV-V36WL/C-T U Service Manual

Chapter 1 Product

Chapter 2 Commissioning

Chapter 3 Faults

Chapter 4 Maintenance

Appendixes

Appendix 1 Temperature Senor Resistance and Temperature Relationship Table

Appendix 2 Refrigerant Temperature and Pressure Table

Appendix 3 Pressure Sensor Voltage and Pressure Table

Appendix 4 Electric Specifications

Appendix 5 Circuit Diagram

Appendix 6 Schematic Diagram

Appendix 7 Names and Functions of Components

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