Midea V8 VRF Series Service Manual
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Midea V8 VRF Series Service Manual

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V8 VRF Indoor Units

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Daniel Amissah
March 25, 2025

What's the address code for V8 machines

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1 comments:
Mr. Anderson
March 25, 2025

The address code for Midea V8 VRF Series machines can be set to any integer within a specific range, depending on the unit's capacity. The minimum address codes are:

- 14≤HP<28: Any integer from 0 to 59
- 28≤HP<36: Any integer from 0 to 58
- 36≤HP<40: Any integer from 0 to 56
- HP>40: Any integer from 0 to 56

The address code is denoted by X, and adjacent addresses are X+1, X+2, X+3, etc.

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Summary of Contents for Midea V8 VRF Series

  • Page 1 R410A Commercial Air Conditioners Service Manual V8 VRF Indoor Units...
  • Page 2 V8 VRF Indoor Units CONTENTS Main PCB Ports ..................2 Indoor unit settings ................17 Display Panels ..................27 Control ....................29 Errors and operation code ..............38 Troubleshooting ..................40 Appendix ....................105...
  • Page 3 V8 VRF Indoor Units 1 Main PCB Ports 1.1 Compact Four-way Cassette Figure 1.1: 1.1 Compact Four-way Cassette main PCB port 12 13 14 15 Table 1.1: Compact Four-way Cassette main PCB ports Label in Code Content Port voltage Note Figure 1.1 CN1(L,N) AC power input...
  • Page 4 V8 VRF Indoor Units Notes: Standard: The model has this function, the customers can connect corresponding device through this port, such as water pump and hotel key card etc. Customized: This function needs to be customized before leaving the factory. Reserved: This port can not be used.
  • Page 5 V8 VRF Indoor Units Table continued on next page … Label in Code Content Description Figure 1.1 CN190 Drainage pump port GND-L CN30 Display panel connection EEV drive port Using other ports’ GND 3.3V CN25 Program burning port(indoor unit) CN99 After-sale Kit communication port...
  • Page 6 V8 VRF Indoor Units 1.2 Four-way Cassette Figure 1.2: Four-way Cassette main PCB ports 12 13 14 15 Table 1.3: Four-way Cassette main PCB ports Label in Code Content Port voltage Note Figure 1.2 CN1(L,N) AC power input 220V AC CN22 AC power output used for customization function: 220V AC...
  • Page 7 V8 VRF Indoor Units Notes: Standard: The model has this function, the customers can connect corresponding device through this port, such as water pump and hotel key card etc. Customized: This function needs to be customized before leaving the factory. Reserved: This port can not be used.
  • Page 8 V8 VRF Indoor Units Label in Code Content Description Figure 1.2 CN190 Drainage pump port GND-L CN30 Display panel connection EEV drive port Using other ports’ GND 3.3V CN25 Program burning port(indoor unit) CN99 After-sale Kit communication port...
  • Page 9 V8 VRF Indoor Units 1.3 Arc Duct Figure 1.3: Arc Duct main PCB ports Table 1.5: Arc Duct main PCB ports Label in Code Content Port voltage Note Figure 1.3 CN1(L.N) AC power input 220V AC Standard CN22 AC power output Used for customization function: 220V AC Standard (ALARM,N,AC2)
  • Page 10 V8 VRF Indoor Units Table 1.5: Arc Duct main PCB ports (continued) Label in Code Content Port voltage Note Figure 1.3 CN81 T2 Temperature sensor connection 3.3V DC Standard CN82 T1 Ambient Temperature sensor connection 3.3V DC Standard CN83 T2B Temperature sensor connection 3.3V DC Standard CN-A...
  • Page 11 V8 VRF Indoor Units Table 1.6: voltage test instructions(continued) Label in Code Content Description Figure 1.3 CN30 Display Panel connection 3.3V CN35 Humidity sensor connection Water level port 3.3V CN190 Drainage pump port Table continued on next page …...
  • Page 12 V8 VRF Indoor Units Table 1.6: voltage test instructions(continued) Label in Code Content Description Figure 1.3 GND -2 CN18 Communication Switch Board GND-1 3.3V CN25 Program burning port(indoor unit) EEV drive port Using other ports’ GND CN99 After-sale Kit communication port...
  • Page 13 V8 VRF Indoor Units 1.4 Medium Static Pressure Duct Figure 1.4: Medium Static Pressure Duct main PCB ports Table 1.7: Medium Static Pressure Duct main PCB ports Label in Code Content Port voltage Note Figure 1.4 CN1(L.N) AC power input 220V AC Standard CN22...
  • Page 14 V8 VRF Indoor Units Table 1.7: Medium Static Pressure Duct main PCB ports (continued) Label in Code Content Port voltage Note Figure 1.4 CN81 T2 Temperature sensor connection 3.3V DC Standard CN82 T1 Ambient Temperature sensor connection 3.3V DC Standard CN83 T2B Temperature sensor connection 3.3V DC...
  • Page 15 V8 VRF Indoor Units 1.5 Wall Mounted Figure 1.5: Wall Mounted main PCB ports 12 13 14 15 Table 1.8: Compact Four-way Cassette main PCB ports Label in Code Content Port voltage Note Figure 1.5 CN1(L,N) AC power input 220V AC CN22 AC power output used for customization function: 220V AC...
  • Page 16 V8 VRF Indoor Units Reserved: This port can not be used. When repairing, PQ connects after-sales tooling PQ and M1M2 communication ports both are used for indoor and outdoor communication, and only one of them can be used at a tim e. Meanwhile, be sure to connect the same communication ports (PQ to PQ;...
  • Page 17 V8 VRF Indoor Units CN190 Drainage pump port GND-L CN30 Display panel connection EEV drive port Using other ports’ GND 3.3V CN25 Program burning port(indoor unit) CN99 After-sale Kit communication port...
  • Page 18 V8 VRF Indoor Units 2 Indoor unit settings 2.1 Parameter settings Taking KJR-86S/BK as an example, the parameters can be set in the power-on or power-off state. ①Hold " " and " " for 3 seconds to enter the parameter setting interface, and the main interface will display "CC"...
  • Page 19 V8 VRF Indoor Units Table 2.1: Wired controller Parameter Settings(continues) Parameter Parameter Default Parameter Name Remarks Code Range Value LED indicator of wired When it is on, LED indicator shows the on/off state of the 00: Off controller 01: On indoor unit.
  • Page 20 V8 VRF Indoor Units Table 2.2: Indoor unit Parameter Settings Parameter Parameter Default Parameter Name Remarks Code Range Value IDU static pressure level: The IDU sets the selected corresponding static pressure (VRF Static pressure of IDU 00/01/02/03/ unit: main board DIP of IDU; other models: reserved) 04/05/06/07/08/ 09/~/19 Power failure memory...
  • Page 21 V8 VRF Indoor Units Table 2.2: Indoor unit Parameter Settings(continues) Parameter Parameter Default Parameter Name Remarks Code Range Value Auxiliary heater used 00: No 00/01 alone 01: Yes 00: Auto Auxiliary heater on/off 00/01/02 01: Forced on 02: Forced off IDU cold draft prevention 0: 15, 01: 20, 02: 24, 03: 26, 04: anti-cold wind invalid 00/01/02/03/04...
  • Page 22 V8 VRF Indoor Units Table 2.2: Indoor unit Parameter Settings(continues) Parameter Parameter Default Parameter Name Remarks Code Range Value 00: 6°C IDU heating mode 01: 2°C temperature 00/01/02/03/04 02: 4°C compensation 03: 8°C 04: 0°C 00: 0°C IDU cooling mode 01: 1°C temperature 00/01/02/03/04...
  • Page 23 V8 VRF Indoor Units Table 2.2: Indoor unit Parameter Settings(continues) Parameter Parameter Default Parameter Name Remarks Code Range Value 00: Turn off the IDU when closed Long-distance on/off 01: Turn off the IDU when open 00/01 function setting Note: When turn off the IDU by long-distance on/off port, the wired controller will display “d6”...
  • Page 24 01: 30 min Stop delay when 00/01/02/03/04/ 02: 45 min unattended 03: 60 min 04: 90 min 05: 120 min Midea ETA function 00: Off 00/01 setting 01: On 00: Level 1 Energy rating of cooling 00/01/02 01: Level 2...
  • Page 25 V8 VRF Indoor Units Table 2.2: Indoor unit Parameter Settings(continues) Paramet Parameter Default Parameter Name Remarks Range Value Code Valve enabled/ disabled 00: Valve enabled at the time of heating at the time of heating 00/01 01: Valve disabled at the time of heating Selection of auxiliary Note: Applicable to fan coil unit only heater...
  • Page 26 V8 VRF Indoor Units 2.2 Indoor unit parameter query Taking KJR-86S/BK as an example ①Hold " " and " " for 2 seconds to enter the query interface, "u00-u03" indicates ODUs, "n00-n63" indicates IDUs (the last two digits are the ODU or IDU addresses), and "CC" indicates the wired controller .
  • Page 27 V8 VRF Indoor Units 2.3 Function Descriptions 2.3.1 Power failure memory function The power failure memory function can be used to ensure that, in the event of a power outage, the indoor units, which was in operation before, automatically restart once the power returns. When the power returns following a power outage, units with Power failure memory function enabled restart with the same operating mode, fan speed and remote control lock status settings as before the power outage.
  • Page 28 V8 VRF Indoor Units 3 Display Panels 3.1 Appearance of Display Panel The appearance of the digital display panel used is shown in Figures 3.1. Figure 3.1: Digital display panel Display panel for Compact Four-way Cassette and Display panel for Arc Duct and Medium Static Pressure Duct Four-way Cassette (Optional) (New 360 degree panel, standard panel)
  • Page 29 V8 VRF Indoor Units 3.2 Output under Normal Operating Conditions Unit state Digital display Standby Cooling and heating : set temperature Normal operation dehumidify mode: set temperature Operating Fan only mode: indoor ambient temperature Special operation Mode code Error Error code Notes: The special operation modes refer to Table 5.2:Operating Status Codes The error code refer to Table 5.1:Error code...
  • Page 30 V8 VRF Indoor Units 4 Control 4.1 Temperature Compensation Control Because of the installation position of Indoor Unit and different layout, indoor temperature detected by Indoor Unit may not consist with actual temperature. Indoor temperature could be compensated by controller (The parameter code is”N25” “N26”) 4.2 EXV Control When the IDU is powered on again or the ODU is stopped, the system automatically enters initialization mode.
  • Page 31 V8 VRF Indoor Units 4.3 Start and Stop Control Indoor Unit judges the operation state according to the difference value between detected indoor temperature (T1) and set temperature (TS). When the indoor temperature reaches the set one, Indoor Unit shut down; when the indoor temperature exceeds the set one, Indoor Unit start running.
  • Page 32 V8 VRF Indoor Units 4.4 Fan Control 4.4.1 Fan speeds control The IDU can work in seven-speeds  Seven-speeds When the Indoor Unit detects only seven wind speeds the wind speed is set as follows. Sleep Speed 1 Speed 2 Speed 3 Speed 4 Speed 5...
  • Page 33 V8 VRF Indoor Units 4.4.3 Anti-cold Air Control This function only be used in heating mode, fan speed is changed according to value changes of the heat exchanger intermediate temperature (T2) of the heat exchanger liquid pipe temperature (T2A) and High pressure equivalent saturation temperature (TC).
  • Page 34 V8 VRF Indoor Units 4.5 Swing control 4.5.1 Horizontal swing control  Angle range of horizontal swing Table 4.1: Angle range of horizontal swing heating cooling A1+A2 A1+A2 adjustable range A1+B/A2+C A1+B/A2+C shutdown angle Figure 4.1 Horizontal swing angle Note: only wall mounted(G) have Horizontal swing control 4.5.2 Vertical swing control Figure 4.2 Vertical swing control Different IDU series have different adjustable...
  • Page 35 V8 VRF Indoor Units Table 4.2: Angle range of vertical swing in wall-mounted. Heating Cooling Ventilation Function operation Static pressure Heating Cooling Anti-condensation Ventilation Self-cleaning detection, leakage Adjustable P1-P5 P1-P5 non-adjustable P1-P5 non-adjustable non-adjustable range Wall-mounted The default gear Table 4.3: Angle range of vertical swing in Four-way Cassette. Heating Cooling/ventilation Function operation...
  • Page 36 V8 VRF Indoor Units 4.6 Operation mode control  Outdoor Unit is Heat Pump ①When the mode is set by ODU to VIP priority, Voting priority, Capability requirements priority, Cooling priority, heating priority, the Indoor Unit can be set to cooling, heating, dehumidification, ventilation modes. When the IDU set mode different from the mode of ODU, the indoor unit will enters the standby mode, and the "No permission"...
  • Page 37 V8 VRF Indoor Units  Set Temperature Display When switching between cooling, heating or auto modes, if temperature Ts is not reset, the temperature after switching is the same as the temperature before switching. In auto mode, switching between cooling and heating mode takes some time. The time can be set through the controller.
  • Page 38 V8 VRF Indoor Units is”N31” ) to change . 3 meters high height, 4 meters high height or 4.5 meters high height can be set. When the high ceiling control is entered, the fan speed limits the minimum speed 3 operation.
  • Page 39 V8 VRF Indoor Units 5 Errors and operation code 5.1 Error Code Table Table 5.1: Error code Error Error Content Content code code Emergency stop Abnormal communication between the IDU and Wi-Fi Kit Abnormal communication between the IDU main control R32 refrigerant leaks, requiring shutdown immediately board and display board Abnormal communication between the AHU Kit slave unit...

  • Page 40: Table Of Contents

    V8 VRF Indoor Units Table 5.1: Error code(continues) Error Error Content Content code code The wireless temperature sensor short-circuits or cuts Unit model code not set The external room temperature sensor short-circuits Horsepower code not set or cuts off Tcp (pre-cooled fresh air temperature sensor) Horsepower code setting error short-circuits or cuts off Tph (pre-heated fresh air temperature sensor)
  • Page 41 V8 VRF Indoor Units 6 Troubleshooting Warning  All electrical work must carried by competent and suitably qualified, certified accredited professionals and in accordance with all applicable legislation (all national, local and other laws, standards, codes, rules, regulations and other legislation that apply in a given situation). ...
  • Page 42 V8 VRF Indoor Units 6.1.1 A01 – Emergency shutdown Digital display Display position Panel, display box, and wired controller The faulty IDU and other IDUs of the same system: stop running, displaying code "A01" (V6 platform IDU displays code "A0") Error impact ODU of the same system: stop running, displaying code "A01"...
  • Page 43 V8 VRF Indoor Units 6.1.2 A11 - R32 refrigerant leaks, requiring shutdown immediately Digital display Display position Error display Panel, display box, and wired controller  Faulty IDU: The fan operates at the highest speed, the EXV is closed (Note: Fault persists after power on again), and buzzer of the display control board of the faulty IDU and buzzer of wired controller connected to the faulty IDU keep beeping.
  • Page 44 V8 VRF Indoor Units  Locate and repair pipeline leaks.  Test nitrogen pressure in the pipeline.  Replace the R32 leakage detection sensor of the faulty IDU.  Recharge refrigerant according to the ODU Installation Manual. Step 2: Reset the R32 refrigerant detection device. As shown in Figure 1 below, after an alarm is triggered for refrigerant leaks, the red LED indicator of the R32 refrigerant detection device (LED3) flashes twice every second.
  • Page 45 V8 VRF Indoor Units 6.1.3 A51 - ODU fault Digital display Display position Error display Panel, display box, and wired controller The faulty IDU and other IDUs of the same system: The fan continues running, the EXV is closed, and code "A51" is displayed (V6 platform IDU displays the code "Ed") ODU of the same system: Error impact ...
  • Page 46 V8 VRF Indoor Units 6.1.4 A71 - The error of the linked FAPU is transmitted to the master IDU (series setting) Note: 1) The type of FAPU may be HRV, VRF fresh air IDU and so on. 2) Series setting: The air supply side of the linked FAPU is directly connected to the air return side of the master IDU thro ugh an air duct.
  • Page 47 V8 VRF Indoor Units 6.1.5 A72 - The error of the linked humidifying IDU is transmitted to the master IDU Digital display Display position (master IDU) Panel or display box Wired controller Error display Spot check interface Error code is not query displayed Master IDU: operates normally.
  • Page 48 V8 VRF Indoor Units 6.1.6 A73 - The error of the linked FAPU is transmitted to the master IDU (non-series connection) Note: 1) The type of FAPU may be HRV, VRF fresh air IDU and so on. 2) Series setting: The linked FAPU and the master IDU are connected to the air supply duct and air return duct respectively a nd separately.
  • Page 49 V8 VRF Indoor Units 6.1.7 A74 - The error of the AHU Kit slave unit is sent to the master unit Note: When multiple AHU Kits are connected in parallel, the master AHU Kit (referred to as the master) communicates with the ODU, and the slave AHU Kit (referred to as the slave) communicates with the master control box.
  • Page 50 V8 VRF Indoor Units 6.1.8 A81 - Self-check fault Digital display Display position Error display Panel, display box, and wired controller Faulty IDU: stops. Other IDUs of the same system:  IDUs that share the same MS with the faulty IDU will stop operating, while other IDUs remain in operation.
  • Page 51 V8 VRF Indoor Units 6.1.9 A82 - MS (refrigerant flow direction switching device) fault Digital display Display position Faulty IDU Panel, display box, and wired controller Faulty IDU: The fan continues running, and the EXV is closed. Other IDUs of the same system: ...
  • Page 52 V8 VRF Indoor Units 6.1.10 A91 - Mode conflict (V6 communication protocol adopted) Digital display Display position Panel, display box, and wired controller Error display (Note: Error codes are displayed 2 minutes after faults are triggered) Faulty IDU: The fan continues running, and the EXV is closed. Other IDUs of the same system: Error impact operate normally.
  • Page 53 V8 VRF Indoor Units 6.1.11 b11, b13 - Error in 1# electronic expansion valve coil, error in 2# electronic expansion valve coil Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally.
  • Page 54 V8 VRF Indoor Units Note: 1. The error code corresponds to the following two situations: a. If there is only one electronic expansion valve port on the main control board of the IDU, when an error occurs in the electronic expansion valve coil connected to the EXV port, the error code is b05. b.
  • Page 55 V8 VRF Indoor Units 6.1.12 b12, b14 - Error in 1# electronic expansion valve body, error in 2# electronic expansion valve body Digital display Display position Panel or display box Wired controller Error display Error code is not Spot check interface query displayed The faulty IDU and other IDUs of the same system: operate normally.
  • Page 56 V8 VRF Indoor Units 6.1.13 b34, b35 - Stall protection for 1# water pump, stall protection on 2# water pump Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally.
  • Page 57 V8 VRF Indoor Units 6.1.14 b36 - Water level switch alarm error Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally. The water level switch alarm is triggered when the floater of the water level switch rises to the warning water Error trigger level and lasts for 5 min.
  • Page 58 V8 VRF Indoor Units Note: 1. The plug attached to the WATER port of the main control board corresponds to the following two cases: a. The factory default of IDUs without a water level switch uses a short-circuit plug to seal the WATER port. b.
  • Page 59 V8 VRF Indoor Units 6.1.15 C11 - Duplicate IDU address code Digital display Display position Panel or display box Wired controller Error display Error code and address Error code and address code are displayed code flash alternately (2) simultaneously Faulty IDU: The fan continues running, and the EXV is closed. Other IDUs of the same system: The fan continues running, the EXV is closed, and error code "A51"...
  • Page 60 V8 VRF Indoor Units integer from denoted by X, and adjacent address is: X+1 minimum address code can integer from Minimum 40≤kW<78.5 14≤HP<28 denoted by X, and address code X adjacent address is: X+1, X+2, X+3 minimum address code can integer from Minimum...
  • Page 61 V8 VRF Indoor Units 2. Repeated display of address codes and confirmation of repeated address codes Error code Display box/panel Wired controller IDU with repeated Error code "C11" and address code are address codes Error code "C11" is (number displayed alternately every 1s (★1) displayed addresses N = 1) If the number of repeated address codes is...
  • Page 62 V8 VRF Indoor Units 6.1.16 C21 - Abnormal communication between IDU and ODU Digital display Display position Error display Panel, display box, and wired controller Faulty IDU: The fan continues running, and the EXV is closed. Other IDUs of the same system: The fan continues running, the EXV is closed, and error code "A51"...
  • Page 63 V8 VRF Indoor Units  If the indoor and outdoor units communicate via MDV-Link (M1M2): Cause 1: M1/M2 cable short- Properly connect the circuits or cuts off (1) cable Cause 2: The repeater UP and DOWN ports are not Properly connect the connected to the cable corresponding indoor unit (2)
  • Page 64 V8 VRF Indoor Units 1) The UP communication port of 1# repeater is connected to the communication port of 10# IDU, and the DOWN communication port of 1# repeater is connected to the communication port of 11# IDU. 2) The UP communication port of 2# repeater is connected to the communication port of 20# IDU, and the DOWN communication port of 2# repeater is connected to the communication port of 21# IDU.
  • Page 65 V8 VRF Indoor Units 6.1.17 C41 - Abnormal communication between IDU main control board and fan drive board Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally.
  • Page 66 V8 VRF Indoor Units 6.1.18 C51 - Abnormal communication between the IDU and wired controller Note: The error code C51 can be triggered either at the IDU side or at the wired controller side. Digital display Display position Triggered at the wired Triggered at the IDU side controller side The error code "C51"...
  • Page 67 V8 VRF Indoor Units 6.1.19 C61 - Abnormal communication between the IDU main control board and display control board Note: The error code C61 can be triggered either at the IDU side or at the panel or display box side. Digital display Display position Triggered at the panel or...
  • Page 68 V8 VRF Indoor Units 6.1.20 C71 - Abnormal communication between AHU Kit slave unit and master unit Note: When multiple AHU Kits are connected in parallel, the master AHU Kit (referred to as the master) communicates with the ODU, and the slave AHU Kit (referred to as the slave) communicates with the master control box. Digital display Display position (master) Error display...
  • Page 69 V8 VRF Indoor Units 6.1.21 C72 - Number of AHU Kits is not the same as the set number Note: When multiple AHU Kits are connected in parallel, the master AHU Kit (referred to as the master) communicates with the ODU, and the slave AHU Kit (referred to as the slave) communicates with the master control box.
  • Page 70 V8 VRF Indoor Units 6.1.22 C73 - Abnormal communication between the linked humidifying IDU and master IDU Digital display Display position (master IDU) Panel or display box Wired controller Error display Spot check interface Error code is not query displayed Master IDU: operates normally.
  • Page 71 V8 VRF Indoor Units 6.1.23 C74 - Abnormal communication between the linked FAPU and master IDU (series setting) Note: 1) The type of FAPU may be HRV, VRF fresh air IDU and so on. 2) Series setting: The air supply side of the linked FAPU is directly connected to the air return side of the master IDU through an air duct.
  • Page 72 V8 VRF Indoor Units 6.1.24 C75 - Communication fault between linked FAPU and master IDU (non-series setting) Note: 1) The type of FAPU may be HRV, VRF fresh air IDU and so on. 2) Series setting: The linked FAPU and the master IDU are connected to the air supply duct and air return duct respectively and separately.
  • Page 73 V8 VRF Indoor Units 6.1.25 C76 - Abnormal communication between the main wired controller and secondary wired controller Note: The error code C51 can be triggered either at the IDU side or at the wired controller side. Digital display Display position (secondary wired controller) Error display The error code "C76"...
  • Page 74 V8 VRF Indoor Units 6.1.26 C77, C78 - Abnormal communication between IDU main control board and 1# function expansion board, abnormal communication between IDU main control board and 2# function expansion board Digital display Display position Error display Panel, display box, and wired controller Faulty IDU: The fan continues running, and the EXV is closed.
  • Page 75 V8 VRF Indoor Units 6.1.27 C79 - Abnormal communication between the IDU main control board and adapter board Digital display Display position Error display Panel, display box, and wired controller Faulty IDU: The fan continues running, and the EXV is closed. Other IDUs of the same system: operate Error impact normally.
  • Page 76 V8 VRF Indoor Units 6.1.28 d16 - Air inlet temperature of IDU is too low in heating mode Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally.
  • Page 77 V8 VRF Indoor Units 6.1.29 d17 - Air inlet temperature of IDU is too high in cooling mode Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally.
  • Page 78 V8 VRF Indoor Units 6.1.30 dE1 - Sensor control board fault Digital display Display position Error display Panel, display box, and wired controller The faulty IDU and other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally. Error trigger If the main control board of an IDU has lost communication with sensor control board for 2 min Error recovery...
  • Page 79 V8 VRF Indoor Units 6.1.31 dE2 - PM2.5 sensor fault Digital display Display position Error display Panel, display box, and wired controller The faulty IDU and other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally. Error trigger If the main control board of an IDU has lost communication with PM2.5 sensor for 2 min Error recovery...
  • Page 80 V8 VRF Indoor Units 6.1.32 dE3 - CO2 sensor fault Digital display Display position Error display Panel, display box, and wired controller The faulty IDU and other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally. Error trigger If the main control board of an IDU has lost communication with CO2 sensor for 2 min Error recovery...
  • Page 81 V8 VRF Indoor Units 6.1.33 dE4 - Formaldehyde sensor fault Digital display Display position Error display Panel, display box, and wired controller The faulty IDU and other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally. Error trigger If the main control board of an IDU has lost communication with formaldehyde sensor for 2 min Error recovery...
  • Page 82 V8 VRF Indoor Units 6.1.34 dE5 - INTELLECTUAL EYE sensor fault Note: The INTELLECTUAL EYE sensor (or human detector) on the smart panel is used to detect the location of the human body. Digital display Display position Error display Panel, wired controller The faulty IDU and other IDUs of the same system: operate normally.

  • Page 83: Cuts Off

    V8 VRF Indoor Units 6.1.35 E21, E24, E81 - T0 (fresh inlet air temperature sensor) short-circuits or cuts off, T1 (IDU return air temperature sensor) short-circuits or cuts off, and TA (outlet air temperature sensor) short-circuits or cuts off Digital display Display position Error display Panel, display box, and wired controller...

  • Page 84: Ea2 Return Air Humidity Sensor Fault

    V8 VRF Indoor Units 6.1.36 EA2 - Return air humidity sensor fault Digital display Display position Panel or display box Wired controller Error display Spot check interface Error code is not query displayed The faulty IDU and other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally.

  • Page 85: Ec1 R32 Refrigerant Leakage Sensor Fault

    V8 VRF Indoor Units 6.1.37 EC1 - R32 refrigerant leakage sensor fault Check the R32 refrigerant leakage sensor of faulty IDU If the measured refrigerant saturation pressure at the liquid side or gas side is equal to the standard saturation pressure, there is no refrigerant leak.
  • Page 86 V8 VRF Indoor Units Figure 1 Schematic diagram of the R32 refrigerant leakage detection system 1-1: Common terminal Connecting an 2-2: Sending R32 refrigerant leakage signal alarm or a fan 3-3: Sending sensor module fault signal 1-1/2-2/3-3 AC220V three-core communication cable output (configured on site) S1 button...
  • Page 87 V8 VRF Indoor Units 6.1.38 F01, F11, F21 - T2A (heat exchanger inlet temperature sensor) short-circuits or cuts off, T2 (heat exchanger middle temperature sensor) short-circuits or cuts off, and T2B (heat exchanger outlet temperature sensor) short-circuits or cuts off Digital display Display position Error display...

  • Page 88: P71 Main Control Board Eeprom Fault

    V8 VRF Indoor Units 6.1.39 P71 - Main control board EEPROM fault Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally. When the master chip cannot receive data from EEPROM (EEPROM: a non-volatile memory whose Error trigger data are kept even when powered off)

  • Page 89: P72 Idu Display Control Board Eeprom Fault

    V8 VRF Indoor Units 6.1.40 P72 - IDU display control board EEPROM fault Digital display Display position Error display Panel or display box The faulty IDU operates normally, and the error code is displayed on the panel or display box only. Other Error impact IDUs of the same system: operate normally.

  • Page 90: U01 Locked (Electronic Lock)

    V8 VRF Indoor Units 6.1.41 U01 - Locked (electronic lock) Digital display Display position Error display Panel, display box, and wired controller All IDUs of the same system: stop running, displaying code "U01" Error impact ODU of the same system: stops running, displaying code "U01" Error trigger When detecting that the ODU is locked Error recovery...
  • Page 91 V8 VRF Indoor Units 6.1.42 U11 - Unit model code not set Digital display Display position Error display Panel, display box, and wired controller 1) The faulty IDU stops running. 2) Other IDUs of the same system:  If the address for the faulty IDU has been set, other IDUs will operate normally. ...

  • Page 92: U12 Horsepower Code Not Set

    V8 VRF Indoor Units 6.1.43 U12 - Horsepower code not set Digital display Display position Error display Panel, display box, and wired controller 1) The faulty IDU stops running. 2) Other IDUs of the same system:  If the address for the faulty IDU has been set, other IDUs will operate normally. ...

  • Page 93: U38 Address Code Not Detected

    V8 VRF Indoor Units 6.1.44 U38 - Address code not detected Digital display Display position Error display Panel, display box, and wired controller 1) The faulty IDU stops running. 2) Other IDUs of the same system: The fan continues running, the EXV is closed, and ODU error code Error impact "A51"...

  • Page 94: J01 Motor Failed More Than Once

    V8 VRF Indoor Units 6.1.45 J01 - Motor failed more than once Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally. Error trigger If fan control faults have occurred 10 times in 120 min (1) Error recovery...

  • Page 95: J1E Ipm (Fan Module) Overcurrent Protection

    V8 VRF Indoor Units 6.1.46 J1E - IPM (fan module) overcurrent protection Digital display Display position Panel or display box Wired controller Error display Spot check interface Error code is not query displayed The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally.

  • Page 96: J11 Instantaneous Overcurrent Protection For Phase Current

    V8 VRF Indoor Units 6.1.47 J11 - Instantaneous overcurrent protection for phase current Digital display Display position Panel or display box Wired controller Error display Spot check interface Error code is not query displayed The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally.

  • Page 97: J3E Low Bus Voltage Fault

    V8 VRF Indoor Units 6.1.48 J3E - Low bus voltage fault Digital display Display position Panel or display box Wired controller Error display Spot check interface query Error code is not displayed The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally.

  • Page 98: J31 High Bus Voltage Fault

    V8 VRF Indoor Units 6.1.49 J31 - High bus voltage fault Digital display Display position Panel or display box Wired controller Error display Spot check interface Error code is not query displayed The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally.

  • Page 99: J43 Phase Current Sample Bias Error

    V8 VRF Indoor Units 6.1.50 J43 - Phase current sample bias error Digital display Display position Panel or display box Wired controller Error display Spot check interface Error code is not query displayed The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally.

  • Page 100: J45 Motor And Idu Are Unmatched

    V8 VRF Indoor Units 6.1.51 J45 - Motor and IDU unmatched Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally. Error trigger If the motor code sent by the IDU main control board is not found in the fan driver Error recovery...

  • Page 101: J47 Ipm And Idu Are Unmatched

    V8 VRF Indoor Units 6.1.52 J47 - IPM (fan module) and IDU unmatched Digital display Display position Error display Panel, display box, and wired controller The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally. Error trigger When detecting that the fan drive board does not match the set value of the driver Error recovery...

  • Page 102: J5E Motor Startup Failure

    V8 VRF Indoor Units 6.1.53 J5E - Motor startup failure Digital display Display position Panel or display box Wired controller Error display Spot check interface Error code is not query displayed The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally.

  • Page 103: J52 Motor Blocking Protection

    V8 VRF Indoor Units 6.1.54 J52 - Motor blocking protection Digital display Display position Panel or display box Wired controller Error display Spot check interface Error code is not query displayed The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally.

  • Page 104: J55 Speed Control Mode Setting Error

    V8 VRF Indoor Units 6.1.55 J55 - Speed control mode setting error Digital display Display position Panel or display box Wired controller Error display Spot check interface Error code is not query displayed The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally.

  • Page 105: J6E Phase Lack Protection Of Motor

    V8 VRF Indoor Units 6.1.56 J6E - Phase lack protection of motor Digital display Display position Panel or display box Wired controller Error display Spot check interface Error code is not query displayed The faulty IDU stops. Other IDUs of the same system: operate normally. Error impact ODU of the same system: operate normally.
  • Page 106 V8 VRF Indoor Units 7 Appendix 7.1 Temperature Sensor Resistance Characteristics Table 7.1: Indoor temperature sensors resistance characteristics R25=10KΩ±3% B25/50=4100K±3% Temperature Resistance Resistance Resistance Temperature Resistance Resistance Resistance (°C) min(kΩ) Normal(kΩ) max(kΩ) (°C) min(kΩ) Normal(kΩ) max(kΩ) 337.762 388.619 446.732 32.140 34.385 36.753 315.441...
  • Page 107 V8 VRF Indoor Units Table 7.1: Indoor temperature sensors resistance characteristics(continues) Temperature Resistance Resistance Resistance Temperature Resistance Resistance Resistance (°C) min(kΩ) Normal(kΩ) max(kΩ) (°C) min(kΩ) Normal(kΩ) max(kΩ) 4.926 5.179 5.441 1.060 1.166 1.281 4.718 4.968 5.225 1.025 1.128 1.240 4.521 4.766 5.019 0.990...
  • Page 108 V8 VRF Indoor Units Table 7.1: Indoor temperature sensors resistance characteristics(continues) Temperature Resistance Resistance Resistance Temperature Resistance Resistance Resistance (°C) min(kΩ) Normal(kΩ) max(kΩ) (°C) min(kΩ) Normal(kΩ) max(kΩ) 0.308 0.351 0.400 0.299 0.342 0.389 0.291 0.332 0.379 0.283 0.324 0.370 0.276 0.315 0.360 0.268...
  • Page 109 V8 VRF Indoor Units 7.2 Indoor and outdoor unit compatibility Indoor Unit V6 platform V8 platform Indoor Unit V8 indoor generation generation AHU-Kit generation Outdoor Unit unit MDV-D*** MI2-*** HRV-*** AHUKZ-**D MIH*** MI2-*** MV5-X*** √ √ √ √ × × V4+W MDVS-*** √...

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