Midea MISSION2 3D INVERTER Series Service Manual
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Midea MISSION2 3D INVERTER Series Service Manual

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SM_MISSION2(GA)_60R410A_3D INVERTER_US_NA_171121
MISSION2 3D INVERTER SERIES
2017 SERVICE MANUAL

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Summary of Contents for Midea MISSION2 3D INVERTER Series

  • Page 1 SM_MISSION2(GA)_60R410A_3D INVERTER_US_NA_171121 MISSION2 3D INVERTER SERIES 2017 SERVICE MANUAL...

  • Page 3: Table Of Contents

    Table of Contents Page 1. Safety Precautions ..................1 Precautions Information servicing 2. Specifications ....................3 Model Reference Electrical Wiring Diagrams 3. Product Features ................... 13 Operation Modes and Functions 4. Maintenance and Disassembly ..............21 Maintenance Disassembly 5. Troubleshooting .................... 72 Safety Caution General Troubleshooting Error Diagnosis and Troubleshooting Without Error Code...

  • Page 5: Safety Precautions

    Safety Precautions Contents In Case of Accidents or Emergency ................2 Pre-Installation ......................2 Operation and Maintenance ..................2...
  • Page 6 For more information, contact your dealer, this task. seller, or an authorized Midea service center. • • When the unit is not to be used for an extended time, disconnect the power supply or turn off the breaker.

  • Page 7: Specifications

    Specifications Contents Model Reference ....................4 Electrical Wiring Diagrams ..................5 Indoor Unit ....................5 Outdoor Unit ....................6...

  • Page 8: Model Reference

    1. Model Reference Refer to the following table to determine the specific indoor and outdoor unit model number of your purchased equipment. Indoor Unit Model Outdoor Unit Model Capacity (Btu) Power Supply MSMBB-09HRFN1-BT0W MOBA01-09HFN1-BT0W 115V~, 60Hz, 1Phase MSMBB-12HRFN1-BT0W MOB01-12HFN1-BT0W MSMBB-09HRFN1-MW0W MOB01-09HFN1-MW0W MSMBB-12HRFN1-MU0W MOB01-12HFN1-MV0W...

  • Page 9: Electrical Wiring Diagrams

    1. Electrical Wiring Diagrams Indoor unit Abbreviation Paraphrase Yellow-Green Conductor Positive and Negative Ion Generator Capacitor PLASMA Electronic Dust Collector LIVE NEUTRAL Heater The Electric Heating Belt of Indoor Unit Indoor Room Temperature Coil Temperature of Indoor Heat Exchanger MSMBB-09HRFN1-BT0W, MSMBB-12HRFN1-BT0W, MSMBB-09HRFN1-MW0W, MSMBB-12HRFN1-MU0W, MSMBD-18HRFN1-MT0W, MSMBD-23HRFN1-MT0W ...

  • Page 10: Outdoor Unit

    Outdoor Unit Abbreviation Paraphrase 4-WAY Gas Valve Assembly/4-WAY VALVE AC-FAN Alternating Current FAN DC-FAN Direct Current FAN AC Current Detector COMP Compressor Coil Temperature of Condenser Outdoor Ambient Temperature Compressor Suction Temperature Compressor Discharge Temperature Electric Expansive Valve L-PRO Low Pressure Switch H-PRO High Pressure Switch MOBA01-09HFN1-BT0W, MOB01-12HFN1-BT0W...
  • Page 11 MOB01-09HFN1-MW0W, MOB01-12HFN1-MV0W, MOCA01-18HFN1-MT0W  Page 7 ...
  • Page 12 MOD01-23HFN1-MT0W  Page 8 ...
  • Page 13 PCB board of MOBA01-09HFN1-BT0W, MOB01-12HFN1-BT0W connect to PFC Capacitor when is on, 100-130V AC connect to reactor output bridge when is on, 100-130V AC output connect to Ground US-KFR-35W/BP3N1-(115V+RX62T+41560).D.13.WP2-1 CN4_1 C N4_2 CN4_3 C N4_4 connect to N-line (100-130VAC INPUT) REACTOR DSA1 connect to L-line...
  • Page 14 PCB board of MOB01-09HFN1-MW0W, MOB01-12HFN1-MV0W, MOCA01-18HFN1-MT0W 290-330VDC standby connect to the bridge 210-300VDC running DR module connect to earth fuse 250V 30A connect to reactance fast recovery diode (FRD) [V1.8] 2015-01-16 CN22 R141 CN6-1 PTC1 DSA1 R154 N-IN R155 R153 power supply 208-230V AC connect to the L-IN FUSE1...
  • Page 15 PCB board of MOD01-23HFN1-MT0W  Page 11 ...
  • Page 16 IPM board of MOD01-23HFN1-MT0W  Page 12 ...

  • Page 17: Product Features

    Product Features Contents Operation Modes and Functions ................15 Abbreviation ....................15 Safety Features ....................15 Display Function ..................15 Fan Mode ....................16 Cooling Mode .....................16 Heating mode .....................17 Auto-mode ....................17 Drying Mode ....................17 Forced Operation Function ................18 1.10 Timer Function ....................18 1.11 Sleep Function .....................18 1.12 Auto-Restart Function ..................18 1.13 Refrigerant Leakage Detection Function ............18 1.14 8°C Heating ....................18...
  • Page 18 Product Features Contents 1.18 Silence（Optional) ..................19 1.19 Electrical energy consumption control function (Optional) ......19 1.20 Information Inquiry ..................19...

  • Page 19: Operation Modes And Functions

    1. Operation Modes and Functions conditioner continues operation and displays the corresponding error code, allowing for emergency use. • When more than one temperature sensor is Abbreviation malfunctioning, the air conditioner ceases operation. Unit element abbreviations Abbreviation Element Display Function Indoor room temperature Unit display functions Coil temperature of evaporator...

  • Page 20: Fan Mode

    Fan Mode fault. • Change setting temperature. When fan mode is activated: • Turbo or sleep function on/off • The outdoor fan and compressor are stopped. • Various frequency limit shutdown occurs. • Temperature control is disabled and indoor room Note: CDIFTEMP is EEPROM setting parameter.

  • Page 21: Heating Mode

    Heating Mode • -When T1-Tsc is lower than or equal to -3°C, fan speed increases to 100%. 1.6.1 Compressor Control 1.6.3 Outdoor Fan Control: 1) Reach the configured temperature • The outdoor unit will be run at different fan speed according to T4 and compressor running frequency.

  • Page 22: Forced Operation Function

    until room temperature exceeds 12°C. • The sleep function is available in cooling, heating, or auto mode. Forced operation function • The operational process for sleep mode is as follows: • When cooling, the temperature rises 1°C (to not • Forced cooling mode: higher than 30°C) every hour.

  • Page 23: Self Clean(Optional)

    mode, or adjusting the set temperature to less than Turn off the unit or activate ECO, sleep, Super cool, Silence 24°C,it will quit the ECO operation. or self clean function will quit this function. • Operation time in ECO mode is 8 hours. After 8 hours 1.20 Information Inquiry the AC quits this mode.
  • Page 24 Displayed code Explanation Additional Notes T1 temperature T2 temperature T3 temperature T4 temperature TP temperature Targeted Frequency Targeted frequency Actual Frequency Actual frequency Compressor current Outdoor AC voltage Indoor capacity test Reserve Running mode Outdoor fan speed Outdoor fan speed EXV opening angle EXV opening angle Indoor fan speed...

  • Page 25: Maintenance And Disassembly

    Maintenance and Disassembly Contents Maintenance ......................22 First Time Installation Check ................22 Refrigerant Recharge ...................24 Re-Installation .....................25 1.3.1 Indoor Unit ..................25 1.3.2 Outdoor Unit ................27 Disassembly ......................29 Indoor Unit ....................29 Outdoor Unit ....................46...

  • Page 26: Maintenance

    1. Maintenance First Time Installation Check To prevent air and moisture from affecting the air Air and moisture trapped in the refrigerant system affects conditioner’s performance, the indoor unit, as well as the the performance of the air conditioner by: pipes between the indoor and outdoor unit, must be be •...
  • Page 27 Procedure: (14.5 Psi) after 50 minutes, check for leakage. Tighten the flare nuts of the indoor and outdoor units, and confirm that both the 2- and 3-way valves • If the pressure successfully reaches -0.1 MPa are closed. (14.5 Psi), fully close the Handle Lo valve, then cease vacuum pump operations.

  • Page 28: Refrigerant Recharge

    Refrigerant Recharge Prior to recharging the refrigerant, confirm the additional amount of refrigerant required using the following table: Models Standard length Max. elevation Max. length Additional refrigerant 9k&12k 7.5m (24.6ft) 10m (32.8ft) 25m (82.0ft) 15g/m (0.16oz/ft) 7.5m (24.6ft) 20m (65.6ft) 30m (98.4ft) 15g/m (0.16oz/ft) 7.5m (24.6ft)

  • Page 29: Re-Installation

    Re-Installation 1.3.1 Indoor Unit Collecting the refrigerant into the outdoor unit Procedure: Confirm that the 2- and 3-way valves are opened. Close the 3-way valve so that the gauge rests between 0.3 MPa (43.5 Psi) and 0.5 MPa (72.5 Psi). Connect the charge hose with the push pin of Handle Lo to the 3-way valve’s gas service port.
  • Page 30 Air purging with vacuum pump Procedure: (14.5 Psi) after 50 minutes, check for leakage. Tighten the flare nuts of the indoor and outdoor units, and confirm that both the 2- and 3-way valves • If the pressure successfully reaches -0.1 MPa are closed.

  • Page 31: Outdoor Unit

    1.3.2 Outdoor Unit Evacuation for the whole system Procedure: needle moves after turning off the vacuum pump. If Confirm that the 2- and 3-way valves are opened. the gauge needle moves backward, check whether Connect the vacuum pump to the 3-way valve’s there is gas leakage.
  • Page 32 Refrigerant charging Procedure: Tighten the flare nuts of the indoor and outdoor and record the starting weight. units, and confirm that both the 2- and 3-way valves Fully open the Handle Lo manifold valve, 2- and are closed. 3-way valves. Slightly connect the Handle Lo charge hose to the Operate the air conditioner in cooling mode and 3-way service port.

  • Page 33: Disassembly

    2. Disassembly Indoor unit Front Panel Procedure Illustration 3) Hold the front panel by the tabs on the both sides and lift it (see CJ_MB1_ Front Panel INV_001). CJ_MB1_INV_001 4) Push up the bottom of an air filter (step 1), and then pull it out downwards (step 2) (see CJ_MB1_ INV_002).
  • Page 34 Procedure Illustration 5) Open the horizontal louver and push the hook towards left to open it (see CJ_MB1_INV_003). Horizontal Louver Hook CJ_MB1_INV_003 6) Bend the horizontal louver lightly by both hands to loosen the hooks, then remove the horizontal louver (see CJ_MB1_INV_004).
  • Page 35 Procedure Illustration 7) Remove 1 screw and then remove the electrical cover(see CJ_MB1_INV_005). CJ_MB1_INV_005 8) Disconnect the two connectors for display board and wifi model. (see CJ_MB1_INV_006) . CJ_MB1_INV_006 9) Slid the front panel side to side to release each axis (see CJ_MB1_ INV_007) CJ_MB1_INV_007 Note: This section is for reference only.
  • Page 36 Procedure Illustration 10) Release the 6 hooks of the vertical blades, then pull the vertical blades rightward and remove it (see CJ_MB1_ INV_008). CJ_MB1_INV_008 11) Remove 1 screw of the display board. (see CJ_MB1_INV_009). CJ_MB1_INV_009 Note: This section is for reference only. Actual unit appearance may vary. ...
  • Page 37 Procedure Illustration 12) Rotate the display board in the direction shown in the right picture. (see CJ_MB1_INV_010 ) CJ_MB1_INV_010 13) Remove 1 screw of the wifi model. (see CJ_MB1_INV_011). CJ_MB1_INV_011 14) Rotate the wifi model in the direction shown in the right picture. (see CJ_ MB1_INV_012) CJ_MB1_INV_012 Note: This section is for reference only.
  • Page 38 Procedure Illustration 15) Open the screw cap and then remove the 2 screws (see CJ_MB1_INV_013). CJ_MB1_INV_013 16) Release the 2 hooks. (see CJ_MB1_ INV_014) CJ_MB1_INV_014 Note: This section is for reference only. Actual unit appearance may vary.  Page 34 ...
  • Page 39 Procedure Illustration 17) Release the 5 hooks in the back (see CJ_MB1_INV_015). CJ_MB1_INV_015 18) Pull out the panel frame while pushing the hook through a clearance between the panel frame and the heat exchanger. (see CJ_MB1_INV_016) CJ_MB1_INV_016 Note: This section is for reference only. Actual unit appearance may vary. ...
  • Page 40 Electrical parts Note: Remove the front panel (refer to 1. Front panel) before disassembling electrical parts. Procedure Illustration Ground Screws 1) Cut the ribbon by a shear, then pull out the coil temperature sensor (T2) (see CJ_MB1_INV_017). 2) Remove one fixing screw of the electronic control box and two screws used for the ground connection (see T2 Sensor...
  • Page 41 Procedure Illustration 4) Remove the fixed devices of the connectors (see CJ_MB1_INV_019). Main Board CJ_MB1_INV_019 Electronic Box 5) Disconnect the connectors of fan motor, the step motor and the T2 sensor (see CJ_MB1_INV_020). CJ_MB1_INV_020 6) Open the left side plate of electronic control box (see CJ_MB1_INV_021).
  • Page 42 Procedure Illustration 7) Open the left side plate of electronic control box (see CJ_MB1_INV_022) CJ_MB1_INV_022 8) Remove 1 screw to take down the power wire (see CJ_MB1_INV_023) CJ_MB1_INV_023 9) Remove the two connectors of the transformer (see CJ_MB1_INV_024) CJ_MB_INV_024 Note: This section is for reference only. Actual unit appearance may vary. ...
  • Page 43 Procedure Illustration 10) Open the two clips along the direction indicated in right image (see CJ_MB1_ INV_024). CJ_MB1_INV_024 11) Pull out the electrical main board along the direction indicated in right image to remove it (see CJ_MB1_ INV_025). CJ_MB1_INV_025 Note: This section is for reference only. Actual unit appearance may vary. ...
  • Page 44 Evaporator Note: Remove the front panel and electrical parts (refer to 1. Front panel and 2. Electrical parts) before disassembling evaporator. Procedure Illustration 1) Disassemble the pipe holder located at the rear of the unit (see CJ_MB1_INV_026). Pipe Holder CJ_MB1_INV_026 2) Remove the 1 screws on the evaporator located at the fixed plate (see CJ_MB1_ INV_027).
  • Page 45 Procedure Illustration 3) Release the hook on the evaporator (see CJ_MB1_INV_028). CJ_MB1_INV_028 Evaporator Remote the one screw on the evaporator located at the fixed plate (see CJ_MB1_ INV_029). CJ_MB1_INV_029 4) Pull out the evaporator (see CJ_MB1_ INV_030). CJ_MB1_INV_030 Note: This section is for reference only. Actual unit appearance may vary. ...
  • Page 46 Fan motor and fan Note: Remove the front panel, electrical parts and evaporator (refer to 1. Front panel, 2. Electrical parts, and 3. Evaporator). before disassembling fan motor and fan. Procedure Illustration 1) Remove the two screws and remove the fixing board of the fan motor (see CJ_ MB1_INV_031).
  • Page 47 Procedure Illustration 3) Remove the fixing screw (see CJ_OP_ INV_020). 4) Pull out the fan motor and fan assembly from the side. Fixing Screw CJ_OP_INV_021 Note: This section is for reference only. Actual unit appearance may vary.  Page 43 ...
  • Page 48 Step motor Note: Remove the front panel and electrical parts (refer to 1. Front panel, 2. Electrical parts) before disassembling step motor. Procedure Illustration 1) Remove the two screws, then remove the stepping motor (see CJ_OP_INV_021). Stepping Motor CJ_OP_INV_021 Note: This section is for reference only. Actual unit appearance may vary. ...
  • Page 49 Drain Hose Procedure Illustration 1) Rotate the fixed wire clockwise indicated in right image (see CJ_MB1_INV_035). CJ_MB1_INV_035 2) Pull up the drain hose to remove it (see CJ_MB1_INV_036). CJ_MB1_INV_036 Note: This section is for reference only. Actual unit appearance may vary. ...

  • Page 50: Outdoor Unit

    Outdoor unit Panel Plate MOB01-12HFN1-BT0W, MOB01-09HFN1-MW0W, MOB01-12HFN1-MV0W Procedure Illustration 1) Turn off the air conditioner and the power breaker. Big Handle 2) Remove the screws of the big handle and then remove the big handle (1 screw) (see CJ_B01_INV_001). CJ_B01_INV_001 Top Cover 3) Remove the screws of the top cover and then remove the top cover (3...
  • Page 51 Procedure Illustration 4) Remove the screws of the left panel and then remove the right panel (2 screws) (see CJ_B01_INV_003). CJ_B01_INV_003 5) Remove the screws of the front panel and then remove the front panel (7 screws) (see CJ_B01_INV_004). Front Panel CJ_B01_INV_004 6) Remove the screws of water collecting cover and then remove the water...
  • Page 52 Procedure Illustration 7) Remove the screws of the right panel and then remove the right panel (5 screws) (see CJ_B01_INV_006). Right Panel CJ_B01_INV_006 Note: This section is for reference only. Actual unit appearance may vary.  Page 48 ...
  • Page 53 MOBA01-09HFN1-BT0W Procedure Illustration 1) Turn off the air conditioner and the power breaker. 2) Remove the screws of the big handle and then remove the big handle (1 screw) (see CJ_BA01_INV_001). CJ_BA01_INV_001 3) Remove the screws of the top cover and then remove the top cover (3 screws).
  • Page 54 Procedure Illustration 1) Remove the screws of the front panel and then remove the front panel (7 screws) (see CJ_BA01_INV_003). CJ_BA01_INV_003 2) Remove the screws of water collecting cover and then remove the water collecting cover (1 screw) (see CJ_ BA01_INV_004).
  • Page 55 Procedure Illustration 1) Remove the screws of the right panel and then remove the right panel (5 screws) (see CJ_BA01_INV_005). CJ_BA01_INV_005 Note: This section is for reference only. Actual unit appearance may vary.  Page 51 ...
  • Page 56 MOCA01-18HFN1-MT0W Procedure Illustration Big Handle 1) Turn off the air conditioner and the power breaker. 2) Remove the screws of the big handle and then remove the big handle (1 screw) (see CJ_CA01_INV_001). CJ_CA01_INV_001 3) Remove the screws of the top cover Top Cover and then remove the top cover (3 screws).
  • Page 57 Procedure Illustration 4) Remove the screws of the front panel and then remove the front panel (7 screws) (see CJ_CA01_INV_003). Front Panel CJ_CA01_INV_003 5) Remove the screws of water collecting cover and then remove the water collecting cover (1 screw) (see CJ_ CA01_INV_004).
  • Page 58 Procedure Illustration 6) Remove the screws of the right panel and then remove the right panel (7 screws) (see CJ_CA01_INV_005). Right Panel CJ_CA01_INV_005 Note: This section is for reference only. Actual unit appearance may vary.  Page 54 ...
  • Page 59 MOD01-23HFN1-MT0W Procedure Illustration 1) Turn off the air conditioner and the power breaker. 2) Remove the screws of the big handle and then remove the big handle (2 screws) (see CJ_D01_INV_001). CJ_D01_INV_001 3) Remove the screws of the top cover and then remove the top cover (4 screws).
  • Page 60 Procedure Illustration 1) Remove the screws of the front right panel and then remove the front right panel (2 screws) (see CJ_D01_ INV_003). CJ_D01_INV_003 2) Remove the screws of the front panel and then remove the front panel (9 screws) (see CJ_D01_INV_004). CJ_D01_INV_004 Note: This section is for reference only.
  • Page 61 Procedure Illustration 1) Remove the screws of water collecting cover and then remove the water collecting cover (2 screw) (see CJ_ D01_INV_005). CJ_D01_INV_005 2) Remove the screws of the right panel and then remove the right panel (8 screws) (see CJ_D01_INV_006). CJ_D01_INV_006 Note: This section is for reference only.
  • Page 62 Fan disassembly Note: Remove the panel plate and (refer to 1. Panel plate) before disassembling fan. MOBA01-09HFN1-BT0W, MOB01-12HFN1-BT0W Procedure Illustration 1) Remove the nut securing the fan with a spanner (see CJ_ODU_ INV_001 ). 2) Remove the fan. CJ_ODU_INV_001 D-cut 3) Remove the screws of the top cover.
  • Page 63 Procedure Illustration 5) Disconnect the connector for fan motor from the electronic control board (see CJ_ODU_INV_004 ). CJ_ODU_INV_004 6) Remove the fixing screws of the fan motor (4 screws) (see CJ_ODU_INV_005 ). 7) Remove the fan motor. Fan Motor CJ_ODU_INV_005 Note: This section is for reference only.
  • Page 64 MOB01-09HFN1-MW0W, MOB01-12HFN1-MV0W, MOCA01-18HFN1-MT0W Procedure Illustration 1) Remove the nut securing the fan with a spanner (see CJ_ODU_ INV_006 ). 2) Remove the fan. D-cut CJ_ODU_INV_006 Hook 3) Unfix the hooks and then open the electronic control box cover (4 hooks) (see CJ_ODU_INV_007 ).
  • Page 65 Procedure Illustration 4) Disconnect the connector for fan motor from the electronic control board (see CJ_ODU_INV_008 ). CJ_ODU_INV_008 5) Remove the fixing screws of the fan motor (4 screws) (see CJ_ODU_INV_009 ). 6) Remove the fan motor. Fan Motor CJ_ODU_INV_009 Note: This section is for reference only.
  • Page 66 MOD01-23HFN1-MT0W Procedure Illustration 1) Remove the nut securing the fan with a spanner (see CJ_ODU_ INV_010 ). 2) Remove the fan. CJ_ODU_INV_010 3) Remove the fixing screws of the electronic control box (see CJ_ODU_ INV_011 ). CJ_ODU_INV_011 4) Unfix the hooks and then open the electronic control box cover (5 hooks) (see CJ_ODU_INV_012 ).
  • Page 67 Procedure Illustration 1) Disconnect the connector for fan motor from the electronic control board (see CJ_ODU_INV_013 ). CJ_ODU_INV_013 2) Remove the fixing screws of the fan motor (4 screws) (see CJ_ODU_INV_014 ). 3) Remove the fan motor. CJ_ODU_INV_014 Note: This section is for reference only. Actual unit appearance may vary. ...
  • Page 68 Electrical parts Note: Remove the panel plate and fan assembly (refer to 1. Panel plate and 2. Fan assembly) before disassembling electrical parts. MOBA01-09HFN1-BT0W, MOB01-12HFN1-BT0W Procedure Illustration 1) Remove the connector for the 4-Way Valve compressor (see CJ_ODU_INV_015 ). 2) Pull out the two blue wires connected with the four way valve ( CJ_ODU_ INV_015 ).
  • Page 69 MOB01-09HFN1-MW0W, MOB01-12HFN1-MV0W, MOCA01-18HFN1-MT0W Procedure Illustration 4-Way Valve 1) Remove the connector for the compressor (see CJ_ODU_INV_016 ). 2) Pull out the two blue wires connected Reactor with the four way valve (see CJ_ODU_ INV_016 ). 3) Pull out connectors of the condenser coil temp.
  • Page 70 MOD01-23HFN1-MT0W Procedure Illustration 1) Remove the connector for the compressor (see CJ_ODU_INV_016 ). 2) Pull out the two blue wires connected with the four way valve (see CJ_ODU_ INV_016 ). 3) Pull out connectors of the condenser coil temp. sensor(T3),outdoor ambient temp.
  • Page 71 Sound blanket WARNING: Recover refrigerant from the refrigerant circuit before remove the compressor. Note: Remove the panel plate, electrical parts, and fan assembly (refer to 1. Panel plate, 2. Electrical parts, and 3. Fan assembly) before disassembling sound blanket. Procedure Illustration 1) Remove the sound blanket (side and top) (see CJ_ODU_INV_017 ).
  • Page 72 Four-way valve WARNING: Recover refrigerant from the refrigerant circuit before remove the four-way valve. Note: Remove the panel plate, electrical parts, and fan assembly (refer to 1. Panel plate, 2. Electrical parts, and 3. Fan assembly) before disassembling four-way valve. Procedure Illustration 1) Heat up the brazed parts and then detach...
  • Page 73 Compressor WARNING: Recover refrigerant from the refrigerant circuit before remove the compressor. Note: Remove the panel plate, electrical parts, and fan assembly (refer to 1. Panel plate, 2. Electrical parts, and 3. Fan assembly) before disassembling compressor. Procedure Illustration 1) Remove the flange nut of terminal cover and remove the terminal cover (see CJ_ ODU_INV_019 ).
  • Page 74 Procedure Illustration 3) Remove the hex nuts and washers securing the compressor, located on the bottom plate (see CJ_ODU_INV_021 ). CJ_ODU_INV_021 Suction Pipe 4) Heat up the brazed parts and then remove the the discharge pipe and the suction pipe (see CJ_ODU_INV_022 ). 5) Lift the compressor from the base pan Discharge Pipe assembly with pliers.
  • Page 75 Troubleshooting Contents Safety Caution .....................73 General Troubleshooting ..................74 Error Diagnosis and Troubleshooting Without Error Code .......77 Remote maintenance ...................77 Field maintenance ..................78 Quick Maintenance by Error Code ..............83 Troubleshooting by Error Code ................84 Common Check Procedures.................84 E0/F4/EA (EEPROM parameter error) ............86 E1 (Indoor and outdoor unit communication error) ........87 E3/F5 (Fan speed is operating outside of the normal range) ......89 E4/E5/F1/F2/F3 (Open circuit or short circuit of temperature sensor diagnosis...

  • Page 76: Troubleshooting

    Contents 5.11 P2(High temperature protection of IPM module diagnosis and solution) ..98 5.12 P4(Inverter compressor drive error diagnosis and solution) ......99 5.13 Compressor driven chip EEPROM parameter error diagnosis and solution ...100 5.14 Zero speed protection of compressor/ outdoor fan or lack of phase of compressor or outdoor fan/Compressor speed malfunction diagnosis and solution .....101 5.15 Communication error between outdoor main chip and compressor driven chip diagnosis and solution ....................102...

  • Page 77: Safety Caution

    3. Safety Caution WARNING Electricity remains in capacitors even when the power supply is off. Ensure the capacitors are fully discharged before troubleshooting. Electrolytic Capacitors For other models, connect discharge resistance (approx.100Ω 40W) or a soldering iron plug between the positive and negative terminals of the electrolytic capacitor.

  • Page 78: General Troubleshooting

    2. General Troubleshooting Error Display (Indoor Unit) When the indoor unit encounters a recognized error, an error code will be displayed. These error codes are described in the following table: Display Error Information Solution E0/EA Indoor unit EEPROM parameter error Page 75 Indoor / outdoor units communication error Page 76...
  • Page 79 2.2 Error Display (outdoor Unit) For MOBA01-09HFN1-BT0W, MOB01-12HFN1-BT0W: There is one red LED on outdoor PCB. When the unit is standby, LED flashes at 0.2Hz. When the unit has some problems, it flashes at 2.5Hz. When operate normally, it is on. For MOB01-09HFN1-MW0W, MOB01-12HFN1-MV0W, MOCA01-18HFN1-MT0W: There are three LED on outdoor PCB: LED1(Yellow color), LED2(Red color) and LED3(Green color) When the unit is standby, LED1 flashes at 0.5Hz.
  • Page 80 MOD01-23HFN1-MT0W: There are three LED on outdoor PCB: LED1(Blue color), LED4(Red color) and LED3(Green color) When the unit is standby, LED1 flashes at 0.5Hz. When the unit has some problems, it flashes at 2.5Hz. When operate normally, it is on. When in low ambient cooling mode, it flashes 4 times then stops 4 seconds. LED4(Red color) and LED3(Green color) refer to the following table: LED4 LED3...

  • Page 81: Error Diagnosis And Troubleshooting Without Error Code

    3. Error Diagnosis and Troubleshooting Without Error Code WARNING Be sure to turn off unit before any maintenance to prevent damage or injury. Remote maintenance SUGGESTION: When troubles occur, please check the following points with customers before field maintenance. Problem Solution Unit will not start Page 79-80...

  • Page 82: Field Maintenance

    Field maintenance Problem Solution Unit will not start Page 81-82 Compressor will not start but fans run Page 81-82 Compressor and condenser (outdoor) fan will not start Page 81-82 Evaporator (indoor) fan will not start Page 81-82 Condenser (Outdoor) fan will not start Page 81-82 Unit runs, but shortly stops Page 81-82...
  • Page 83 4. Quick Maintenance by Error Code If you do not have the time to test whether specific parts are faulty, you can directly change the required parts according the error code. You can find the parts to replace by error code in the following table. Error Code Part requiring replacement...
  • Page 84 1.Remote Maintenance Electrical Circuit Refrigerant Circuit Possible causes of trouble Unit will not start ☆ ☆ ☆ ☆ The power switch is on but fans will not start ☆ ☆ ☆ The temperature on the display board cannot be set ☆...
  • Page 85 Others ☆ ☆ ☆ ☆ ☆ ☆ ☆  Page 81 ...
  • Page 86 Electrical Circuit 2.Field Maintenance Possible causes of trouble Unit will not start ☆ ☆ ☆ ☆ ☆ ☆ Compressor will not start but fans run ☆ ☆ ☆ ☆ ☆ Compressor and condenser (outdoor) fan will not start ☆ ☆ ☆...

  • Page 87: Quick Maintenance By Error Code

    Refrigerant Circuit Others ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆...

  • Page 88: Troubleshooting By Error Code

    5. Troubleshooting by Error Code Common Check Procedures 5.1.1 Temperature Sensor Check Disconnect the temperature sensor from PCB, measure the resistance value with a tester. Temperature Sensors. Room temp.(T1) sensor, Indoor coil temp.(T2) sensor, Outdoor coil temp.(T3) sensor, Outdoor ambient temp.(T4) sensor, Compressor discharge temp.(Tp) sensor.
  • Page 89 5.1.3 IPM Continuity Check Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital tester to measure the resistance between P and UVWN; UVW and N. Normal resistance Normal resistance Digital tester Digital tester value value...

  • Page 90: E0/F4/Ea (Eeprom Parameter Error)

    E0/F4/EA (EEPROM parameter error) Description: Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip. Recommended parts to prepare: • Indoor PCB • Outdoor PCB Troubleshooting and repair: Shut off the power supply and turn it on 2 minutes later. Is it still displaying the error The unit is operating normally.

  • Page 91: E1 (Indoor And Outdoor Unit Communication Error)

    E1 (Indoor and outdoor unit communication error) Description: The indoor unit has not received feedback from the outdoor unit for 150 seconds, four consecutive times. Recommended parts to prepare: • Indoor PCB • Outdoor PCB • Reactor Troubleshooting and repair: Power off, then restart the unit after 2 minutes.
  • Page 92 Remarks: • Use a multimeter to test the DC voltage between 2 port and 3 port of outdoor unit. The red pin of multimeter connects with 2 port while the black pin is for 3 port. • When AC is normal running, the voltage is moving alternately as positive values and negative values. •...

  • Page 93: E3/F5(Fan Speed Is Operating Outside Of The Normal Range)

    E3/F5(Fan speed is operating outside of the normal range) Description: When the indoor fan speed keeps too low (200RPM) or too high (2100RPM) for an extended period of time, the unit will stop and the LED will display the failure(E3). When the outdoor fan speed registers below 200RPM or over 1500RPM for an extended period of time, the unit will stop and the LED will display the failure(F5).
  • Page 94 Index: 1. Indoor or Outdoor DC Fan Motor(control chip is in fan motor) Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan motor connector. If the value of the voltage is not in the range showing in below table, the PCB must has problems and need to be replaced. •...

  • Page 95: E4/E5/F1/F2/F3

    E4/E5/F1/F2/F3 (Open circuit or short circuit of temperature sensor diagnosis and solution) Description: If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED will display the failure. Recommended parts to prepare: • Wiring mistake • Faulty sensor •...

  • Page 96: Eb (Communication Error Between The Indoor Pcb And Display Board)

    Eb (Communication error between the indoor PCB and display board) Description: Indoor PCB does not receive feedback from Display board. Recommended parts to prepare: • Wiring mistake • PCB faulty • Display board malfunction Troubleshooting and repair: Power off, then restart the unit 2 minutes later.

  • Page 97: Ec (Refrigerant Leakage Detection Diagnosis And Solution)

    EC (Refrigerant Leakage Detection diagnosis and solution) Description: Define the evaporator coil temperature T2 of the compressor just starts running as Tcool. In the beginning 5 minutes after the compressor starts up, if T2<Tcool-2°C does not keep continuous 4 seconds and this situation happens 3 times, the display area will show “EC”...

  • Page 98: F0(Overload Current Protection Diagnosis And Solution)

    F0(Overload current protection diagnosis and solution) Description: An abnormal current rise is detected by checking the specified current detection circuit. Recommended parts to prepare: • Power supply problems. • System blockage • Faulty PCB • Wiring mistake • Compressor malfunction Troubleshooting and repair: Check the power supply.

  • Page 99: P0(Ipm Malfunction Diagnosis And Solution)

    P0(IPM malfunction diagnosis and solution) Description: When the voltage signal the IPM sends to the compressor drive chip is abnormal, the display LED shows “P0” and the AC turn off. Recommended parts to prepare: • Wiring mistake • IPM malfunction •...

  • Page 100: P1(Over Voltage Or Too Low Voltage Protection Diagnosis And Solution)

    5.10 P1(Over voltage or too low voltage protection diagnosis and solution) Description: Abnormal increases or decreases in voltage are detected by checking the specified voltage detection circuit. Recommended parts to prepare: • Power supply issues • System leakage or blockage •...
  • Page 101 Remark: • Measure the DC voltage between P and N port. The normal value should be around 310V.  Page 97 ...

  • Page 102: P2(High Temperature Protection Of Ipm Module Diagnosis And Solution)

    5.11 P2(High temperature protection of IPM module diagnosis and solution) Description: If the temperature of IPM module is higher than limited value, the LED displays this failure code. Recommended parts to prepare: • Faulty PCB • Connection problems Troubleshooting and repair: Check the fastening screws on the PCB and IPM radiator.

  • Page 103: P4(Inverter Compressor Drive Error Diagnosis And Solution)

    5.12 P4(Inverter compressor drive error diagnosis and solution) Description: An abnormal inverter compressor drive is detected by a special detection circuit, including communication signal detection, voltage detection, compressor rotation speed signal detection and so on. Recommended parts to prepare: • Wiring mistake •...

  • Page 104: Compressor Driven Chip Eeprom Parameter Error Diagnosis And Solution

    5.13 Compressor driven chip EEPROM parameter error diagnosis and solution Description: Outdoor PCB main chip does not receive feedback from compressor driven EEPROM chip. Recommended parts to prepare: • Outdoor PCB Troubleshooting and repair: Shut off the power supply and turn it on 2 minutes later.

  • Page 105: Zero Speed Protection Of Compressor/ Outdoor Fan Or Lack Of Phase Of Compressor Or

    5.14 Zero speed protection of compressor/ outdoor fan or lack of phase of compressor or outdoor fan/Compressor speed malfunction diagnosis and solution Recommended parts to prepare: • Wiring mistake • Faulty fan assembly faulty • Faulty fan motor • Faulty PCB •...

  • Page 106: Communication Error Between Outdoor Main Chip And Compressor Driven Chip Diagnosis And Solution

    5.15 Communication error between outdoor main chip and compressor driven chip diagnosis and solution Recommended parts to prepare: • Faulty PCB Troubleshooting and repair: Shut off the power supply and turn it on 2 minutes later. Is it still displaying The unit is operating normally.

  • Page 107: Igbt Over-Strong Current Protection Diagnosis And Solution

    5.16 IGBT over-strong current protection diagnosis and solution Recommended parts to prepare: • Faulty IGBT • Faulty outdoor PCB Troubleshooting and repair: Shut off the power supply and turn it on 2 minutes later. Is it still displaying The unit is operating normally. the error code? Replace the outdoor main PCB.

  • Page 108: Appendix

    Appendix Contents Temperature Sensor Resistance Value Table for T1, T2, T3, and T4 (°C – K) ..105 Temperature Sensor Resistance Value Table for TP (°C – K)......106 ∆T(°F)=(9∆T(°C))/5 ....................107 iii) Pressure On Service Port ...................108...

  • Page 109: I) Temperature Sensor Resistance Value Table For T1,T2,T3 And T4 (°C - K)

    i) Temperature Sensor Resistance Value Table for T1,T2,T3 and T4 (°C – K) °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm 115.266 12.6431 2.35774 0.62973 108.146 12.0561 2.27249 0.61148 101.517 11.5 2.19073 0.59386 96.3423 10.9731...

  • Page 110: Ii) Temperature Sensor Resistance Value Table For Tp (°C - K)

    ii) Temperature Sensor Resistance Value Table for TP (°C – K) °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm °C °F K Ohm 542.7...

  • Page 111: T(°F)=(9∆T(°C))/5

    iii) ∆T(°F)=(9∆T(°C))/5 °C °F °C °F °C °F °C °F °C °F 69.8 123.8 179.6 235.4 24.8 71.6 125.6 181.4 237.2 26.6 73.4 127.4 183.2 28.4 75.2 129.2 240.8 30.2 186.8 242.6 25.5 77.9 132.8 188.6 244.4 32.9 78.8 134.6 190.4 246.2 33.8...

  • Page 112: Iv) Pressure On Service Port

    iv) Pressure On Service Port Cooling chart: °F(°C) 0(-17) 5(-15) 95 (35) (9.44) (7.22) (23.89) (29.44) (40.56) (46.11) (48.89) 70/59 10.1 10.6 75/63 10.7 11.2 80/67 11.2 11.9 90/73 10.5 10.3 10.0 10.6 12.4 13.0 °F(°C) 0(-17) 5(-15) 95 (35) (9.44) (7.22) (23.89)
  • Page 113 Heating chart: 57/53 47/43 37/33 27/23 17/13 (-8.33/- 0/-2 -17/-18 °F(°C) (13.89/11.67) (8.33/6.11) (2.78/0.56) (-2.78/-5) 10.56) (-17/-19) (-27/-28) 30.3 28.5 25.3 22.8 20.8 18.5 16.5 32.5 30.0 26.6 25.4 23.3 20.5 19.0 33.8 31.5 27.8 26.3 24.9 21.5 20.0 57/53 47/43 37/33 27/23...

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