INVENTOR O3MVI32-09WiFiR Service Manual
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INVENTOR O3MVI32-09WiFiR Service Manual

Wall mounted unit air conditioning systems
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AIR CONDITIONING SYSTEMS
WALL MOUNTED UNIT

• SERVICE MANUAL

MODELS:
O3MVI32-09WiFiR/O3MVO32-09
O3MVI32-12WiFiR/O3MVO32-12
O3MVI32-18WiFiR/O3MVO32-18
O3MVI32-24WiFiR/O3MVO32-24
ENGLISH

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Summary of Contents for INVENTOR O3MVI32-09WiFiR

  • Page 1: Service Manual

    AIR CONDITIONING SYSTEMS WALL MOUNTED UNIT • SERVICE MANUAL MODELS: O3MVI32-09WiFiR/O3MVO32-09 O3MVI32-12WiFiR/O3MVO32-12 O3MVI32-18WiFiR/O3MVO32-18 O3MVI32-24WiFiR/O3MVO32-24 ENGLISH...

  • Page 3: Table Of Contents

    Table of Contents Page 1. Safety Precautions ..................1 Precautions Information servicing 2. Specifications ....................7 Model Reference Electrical Wiring Diagrams 3. Product Features ................... 13 Operation Modes and Functions 4. Maintenance and Disassembly ..............20 Maintenance Disassembly 5. Troubleshooting .................... 59 Safety Caution General Troubleshooting Error Diagnosis and Troubleshooting Without Error Code...

  • Page 5: Safety Precautions

    Safety Precautions Contents Precautions ......................2 Information servicing ....................3...

  • Page 6: Precautions

    1. Precautions CAUTION To prevent personal injury, or property or unit damage, • • While unpacking be careful of sharp edges around adhere to all precautionary measures and instructions the unit as well as the edges of the fins on the con- denser and evaporator.

  • Page 7: Information Servicing

    2. Information servicing hazards or ignition risks. • NO SMOKING signs shall be displayed. Checks to the area Ventilated area • Prior to beginning work on systems containing flammable • Ensure that the area is in the open or that it is adequately refrigerants, safety checks are necessary to ensure that the ventilated before breaking into the risk of ignition is minimized.
  • Page 8 • that capacitors are discharged: this shall be done in shall also take into account the effects of aging or a safe manner to avoid possibility of sparking; continual vibration from sources such as compressors or fans. • that there no live electrical components and wiring are exposed while charging, recovering or purging 2.13 Detection of flammable refrigerants the system;...

  • Page 9: Charging Procedures

    • The refrigerant charge shall be recovered into the • Before attempting the procedure ensure that: correct recovery cylinders. The system shall be flushed • mechanical handling equipment is available, if with OFN to render the unit safe. This process may required, for handling refrigerant cylinders;...
  • Page 10 • Empty recovery cylinders are evacuated and, if • The recovered refrigerant shall be returned to the possible, cooled before recovery occurs. refrigerant supplier in the correct recovery cylinder, and the relevant Waste Transfer Note arranged. Do not • The recovery equipment shall be in good working mix refrigerants in recovery units and especially not in order with a set of instructions concerning the cylinders.

  • Page 11: Specifications

    Specifications Contents Model Reference ....................8 Electrical Wiring Diagrams ..................9 Indoor Unit ....................9 Outdoor Unit ....................11...

  • Page 12: 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 O3MVI32-09WiFiR O3MVO32-09 O3MVI32-12WiFiR O3MVO32-12 220-240V~, 50Hz, 1Phase O3MVI32-24WiFiR...

  • Page 13: Electrical Wiring Diagrams

    2. 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 Middle ...
  • Page 14 O3MVI32-09WiFiR, O3MVI32-12WiFiR, O3MVI32-18WiFiR, O3MVI32-24WiFiR OPTIONAL OPTIONAL Applicable to INDOOR WIRING DIAGRAM AC motor only 16022000020169 5(3or2) HEATER SWITCH BOARD CN701 OPTIONAL HA HB E 12V/5V Applicable for MULTI and MONO unit without 1W standby control feature OPTIONAL Applicalbe for MONO unit with...

  • Page 15: 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 L-PRO Low Pressure Switch H-PRO High Pressure Switch Electronic Expansion Valve O3MVO32-09, O3MVO32-12, O3MVO32-18 BLUE OR BLACK BROWN 2(N) 1(L) I N D O O R U N I T...
  • Page 16 O3MVO32-24 16022000019069 Applicable to Applicable to the units adopting the units adopting DC motor only AC motor only H EATER 2 C N 4 OPTIONAL: BROWN CN30 BLUE YELLOW （ ） BLACK(BLUE) TO I NDO O R UNI T PO W ER SUPPLY ...

  • Page 17: Product Features

    Product Features Contents Operation Modes and Functions ................14 Abbreviation ....................14 Safety Features ....................14 Display Function ..................14 Fan Mode ....................15 Cooling Mode .....................15 Heating Mode .....................15 Auto-mode ....................16 Drying Mode ....................16 Forced Operation Function ................16 1.10 Sleep Function .....................16 1.11 Auto-Restart Function ..................16 1.12 Refrigerant Leakage Detection ..............17 1.13 8°C Heating(Optional) ................17...

  • Page 18: Operation Modes And Functions

    1. Operation Modes and Functions Compressor preheating Preheating is automatically activated when T4 sensor is Abbreviation lower than 3°C. Sensor redundancy and automatic shutoff Unit element abbreviations • If one temperature sensor malfunctions, the air Abbreviation Element conditioner continues operation and displays the Indoor room temperature corresponding error code, allowing for emergency use.

  • Page 19: Fan Mode

    Fan Mode 1.6.1 Compressor Control ∆T means the temperature compensation. When fan mode is activated: • When T1-Ts>-∆T, the compressor ceases operation. • The outdoor fan and compressor are stopped. • When T1-Ts<-∆T-1.5°C, the compressor continues • Temperature control is disabled and no temperature operation.

  • Page 20: Auto-Mode

    Auto-mode • Follow me • This mode can be selected with the remote controller 1.10 Sleep function and the setting temperature can be changed between 17°C~30°C. • The sleep function is available in cooling, heating, or auto mode. • In auto mode, the machine selects cooling, heating, or fan-only mode on the basis of ∆T (∆T =T1-Ts).

  • Page 21: Refrigerant Leakage Detection

    • For heat pump models, the indoor unit will run in fan-only mode, then low heat, and finally in fan- only mode. • Self Clean keeps the indoor unit dry and prevents mold growth. 1.15 Follow me(Optional) • If you press “Follow Me” on the remote, the indoor unit will beep.
  • Page 22 Displayed Displayed code Explanation Meaning Additional Notes value Room temperature 1. All displayed temperatures use actual values. Indoor coil temperature 2. All temperatures are -1F,-1E,-1d,-1c,- -25,-24,-23,-22, displayed in °C regardless Outdoor coil 1b,-1A -21,-20 of remote used. temperature -19—99 -19—99 3.
  • Page 23 Displayed Displayed code Explanation Meaning Additional Notes value 0-FF 2-28 Reserved 5-20 5-25  Page 19 ...

  • Page 24: Maintenance And Disassembly

    Maintenance and Disassembly Contents Maintenance ......................21 First Time Installation Check ................21 Refrigerant Recharge ...................23 Re-Installation .....................24 1.3.1 Indoor Unit ..................24 1.3.2 Outdoor Unit ................26 Disassembly ......................28 Indoor Unit ....................28 Outdoor Unit ....................40...

  • Page 25: 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 26 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 27: 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 5m (16.4ft) 10m (32.8ft) 25m (82.0ft) 12g/m (0.13oz/ft) 5m (16.4ft) 20m (65.6ft) 30m (98.4ft) 12g/m (0.13oz/ft) 5m (16.4ft)

  • Page 28: 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 Disconnect the charge set and mount the caps of Lo to the 3-way valve’s gas service port.
  • Page 29 Air purging with vacuum pump Procedure: 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 30: 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 31 Refrigerant charging Procedure: Close both 2- and 3-way valves. 3-way valves. Slightly connect the Handle Lo charge hose to the Operate the air conditioner in cooling mode to charge 3-way service port. the system with liquid refrigerant. Connect the charge hose to the valve at the bottom When the electronic scale displays the correct weight of the cylinder.

  • Page 32: Disassembly

    2. Disassembly Indoor unit Front Panel Procedure Illustration 1) Hold the front panel by the tabs on Front Panel the both sides and lift it (see CJ_AF_ INV_001). CJ_AF_INV_001 2) Push up the bottom of an air filter, and then pull it out downwards (see CJ_AF_INV_002).
  • Page 33 Procedure Illustration 3) Open the horizontal louver and push the hook towards left to open it (see CJ_AF_INV_003). Horizontal Louver Hook CJ_AF_INV_003 4) Bend the horizontal louver lightly by both hands to loosen the hooks, then remove the horizontal louver (see CJ_AF_INV_004).
  • Page 34 Procedure Illustration 5) Remove 1 screw and then remove the electrical cover(see CJ_AF_INV_005-1 and CJ_AF_INV_005-2). CJ_AF_INV_005-1 CJ_AF_INV_005-2 6) Disconnect the connector for display board(see CJ_AF_INV_005-3) . CJ_AF_INV_005-3 7) Remove the display board(see CJ_AF_ INV_005-4). CJ_AF_INV_005-4 CJ_AF_INV_005 Note: This section is for reference only. Actual unit appearance may vary. ...
  • Page 35 Procedure Illustration 8) Open the screw caps(2) and the remove the screws(see CJ_AF_ INV_006). 9) Release the 4 hooks. CJ_AF_INV_006 10) Release the seven hooks in the back (see CJ_AF_INV_007). Hooks CJ_AF_INV_007 Note: This section is for reference only. Actual unit appearance may vary. ...
  • Page 36 Procedure Illustration 11) Pull out the panel frame while pushing the hook through a clearance between the panel frame and the heat exchanger (see CJ_AF_INV_008). CJ_AF_INV_008 Panel Frame Note: This section is for reference only. Actual unit appearance may vary. ...
  • Page 37 Electrical parts Note: Remove the front panel (refer to 1. Front panel) before disassembling electrical parts. Procedure Illustration 1) Remove the fixing screw and then remove the cover of electronic box and the terminal cover (see CJ_AF_ Electronic Cover INV_009). Fixing Screw CJ_AF_INV_009 2) Pull out the room temperature sensor...
  • Page 38 Procedure Illustration 4) Remove the fixing screw (see CJ_AF_ INV_011-1). 5) Pull out the Electrical control box along the direction indicated in right image. to remove it (CJ_AF_INV_011-2). Fixing Screw CJ_AF_INV_011-1 Electronic Box CJ_AF_INV_011-2 Swing Motor Applicable to AC Motor Only Indoor Fan Motor 6) Disconnect the wires.
  • Page 39 Procedure Illustration 7) Remove the fixing screw, then remove the capacitor of fan motor (see CJ_AF_ INV_013). Capacitor of Fan Motor CJ_AF_INV_013 Note: This section is for reference only. Actual unit appearance may vary.  Page 35 ...
  • Page 40 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_AF_INV_014). Pipe Holder CJ_AF_INV_014 2) Remove the screws on the evaporator located at the fixed plate (see CJ_AF_ INV_015).
  • Page 41 Procedure Illustration 4) Pull out the evaporator (see CJ_AF_ Evaporator INV_017). CJ_AF_INV_017 Note: This section is for reference only. Actual unit appearance may vary.  Page 37 ...
  • Page 42 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_AF_ INV_018).
  • Page 43 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_AF_INV_021). Stepping Motor CJ_AF_INV_021 Note: This section is for reference only. Actual unit appearance may vary. ...

  • Page 44: Outdoor Unit

    Outdoor unit Panel Plate O3MVO32-09, O3MVO32-12 Procedure Illustration 1) Turn off the air conditioner and the power breaker. 2) Remove the screws of the big handle Big Handle and then remove the big handle (1 screws) (see CJ_AB30_INV_001). CJ_AB30_INV_001 Top Cover 3) Remove the screws of the top cover and then remove the top cover (3 screws).
  • Page 45 Procedure Illustration 4) Remove the screws of the front panel and then remove the front panel (6 screws) (see CJ_AB30_INV_003). Front Panel CJ_AB30_INV_003 5) Remove the screws of water collecting cover (1 screw) (see CJ_AB30_ INV_004). Water Collecting Cover CJ_AB30_INV_004 Note: This section is for reference only.
  • Page 46 Procedure Illustration 1) Remove the screws of the right panel and then remove the right panel (5 screws) (see CJ_AB30_INV_005). Right Panel CJ_AB30_INV_005 Note: This section is for reference only. Actual unit appearance may vary.  Page 42 ...
  • Page 47 O3MVO32-18, 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 screws) (see CJ_B30_INV_001). CJ_B30_INV_001 Top Cover 3) Remove the screws of the top cover and then remove the top cover (3 screws).
  • Page 48 Procedure Illustration 1) Remove the screws of the front panel and then remove the front panel (8 screws) (see CJ_B30_INV_003). Front Panel CJ_B30_INV_003 2) Remove the screws of water collecting cover and then remove the water collecting cover (1 screw) (see CJ_B30_ INV_004).
  • Page 49 Procedure Illustration 3) Remove the screws of the right panel and then remove the right panel (5 screws) (see CJ_B30_INV_005). CJ_B30_INV_005 Right Panel Note: This section is for reference only. Actual unit appearance may vary.  Page 45 ...
  • Page 50 O3MVO32-24 Procedure Illustration 1) Turn off the air conditioner and the Big Handle power breaker. 2) Remove the screws of the big handle and then remove the big handle (1 screws) (see CJ_CA30_INV_001). CJ_CA30_INV_001 Top Cover 3) Remove the screws of the top cover and then remove the top cover (3 screws).
  • Page 51 Procedure Illustration 4) Remove the screws of the front panel and then remove the front panel (7 screws) (see CJ_CA30_INV_003). Front Panel CJ_CA30_INV_003 5) Remove the screws of water collecting cover and then remove the water collecting cover (1 screw) (see CJ_ Water Collecting Cover CA30_INV_004).
  • Page 52 Procedure Illustration 1) Remove the screws of the right panel and then remove the right panel (6 screws) (see CJ_CA30_INV_005). Right Panel CJ_CA30_INV_005 Note: This section is for reference only. Actual unit appearance may vary.  Page 48 ...
  • Page 53 Fan disassembly Note: Remove the panel plate and (refer to 1. Panel plate) before disassembling fan. O3MVO32-09, O3MVO32-12, O3MVO32-18 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 54 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 55 O3MVO32-24 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 ). CJ_ODU_INV_007 Note: This section is for reference only.
  • Page 56 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. CJ_ODU_INV_009 Note: This section is for reference only. Actual unit appearance may vary. ...
  • Page 57 Electrical parts Note: Remove the panel plate and fan assembly (refer to 1. Panel plate and 2. Fan assembly) before disassembling electrical parts. O3MVO32-09, O3MVO32-12, O3MVO32-18 Procedure Illustration 1) Remove the connector for the 4-Way Valve compressor (see CJ_ODU_INV_010 ). 2) Pull out the two blue wires connected with the four way valve ( CJ_ODU_ INV_010 ).
  • Page 58 O3MVO32-24 Procedure Illustration 1) Remove the connector for the 4-Way Valve compressor (see CJ_ODU_INV_011 ). 2) Pull out the two blue wires connected Reactor with the four way valve (see CJ_ODU_ INV_011 ). 3) Pull out connectors of the condenser coil temp.
  • Page 59 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_012 ).
  • Page 60 Four-way valve (for heat pump models) 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 61 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_014 ).
  • Page 62 Procedure Illustration 3) Remove the hex nuts and washers securing the compressor, located on the bottom plate (see CJ_ODU_INV_016 ). CJ_ODU_INV_016 Suction Pipe 4) Heat up the brazed parts and then remove the the discharge pipe and the suction pipe (see CJ_ODU_INV_017 ). 5) Lift the compressor from the base pan Discharge Pipe assembly with pliers.

  • Page 63: Troubleshooting

    Troubleshooting Contents Safety Caution .....................61 General Troubleshooting ..................62 Error Diagnosis and Troubleshooting Without Error Code .......63 Remote maintenance ...................63 Field maintenance ..................64 Quick Maintenance by Error Code ..............65 Troubleshooting by Error Code ................70 Common Check Procedures.................70 E0/F4 (EEPROM parameter error) ..............72 E1 (Indoor and outdoor unit communication error) ........73 E2 (Zero crossing detection error diagnosis and solution) ......75 E3/F5 (Fan speed is operating outside of the normal range diagnosis and...
  • Page 64 Contents solution) .....................82 5.10 P1(Over voltage or too low voltage protection diagnosis and solution) ..83 5.11 P2(High temperature protection of IPM module diagnosis and solution) ..84 5.12 P4(Inverter compressor drive error diagnosis and solution) ......85...

  • Page 65: Safety Caution

    1. 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 66: General Troubleshooting

    2. General Troubleshooting Error Display (Indoor Unit) When the indoor unit encounters a recognized error, the operation lamp will flash in a corresponding series, the timer lamp may turn on or begin flashing, and an error code will be displayed. These error codes are described in the following table: Operation lamp...

  • Page 67: 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 66-67...

  • Page 68: Field Maintenance

    Field maintenance Problem Solution Unit will not start Page 68-69 Compressor will not start but fans run Page 68-69 Compressor and condenser (outdoor) fan will not start Page 68-69 Evaporator (indoor) fan will not start Page 68-69 Condenser (Outdoor) fan will not start Page 68-69 Unit runs, but shortly stops Page 68-69...

  • Page 69: Quick Maintenance By Error Code

    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 Indoor PCB...
  • Page 70 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 71 Others ☆ ☆ ☆ ☆ ☆ ☆ ☆  Page 67 ...
  • Page 72 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 73 Refrigerant Circuit Others ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆...

  • Page 74: 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 75 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 76: E0/F4 (Eeprom Parameter Error)

    E0/F4 (EEPROM parameter error) Description: Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip. Recommended parts to prepare: • Faulty indoor PCB • Faulty outdoor PCB Troubleshooting and repair: Shut off the power supply and turn it on 2 minutes later.

  • Page 77: 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 110 seconds, four consecutive times. Recommended parts to prepare: • Faulty indoor PCB • Faulty outdoor PCB • Faulty reactor Troubleshooting and repair: Power off, then restart the unit after 2 minutes.
  • Page 78 Remarks: • Use a multimeter to test the resistance of the reactor which does not connect with capacitor. • The normal value should be around zero ohm. Otherwise, the reactor must have malfunction.  Page 74 ...

  • Page 79: E2 (Zero Crossing Detection Error Diagnosis And Solution)

    E2 (Zero crossing detection error diagnosis and solution) Description: When PCB does not receive zero crossing signal feedback for 4 minutes or the zero crossing signal time interval is abnormal. Recommended parts to prepare: • Connection mistake • Faulty PCB Troubleshooting and repair: Check the connections and power supply.

  • Page 80: E3/F5

    E3/F5 (Fan speed is operating outside of the normal range) Description: When the indoor fan speed keeps too low (300RPM) for certain 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 81 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 82: 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 83: E7 (Indoor Pcb /Display Board Communication Error)

    E7 (Indoor PCB /Display board communication error) Description: Indoor PCB does not receive feedback from Display board for 120 seconds. Recommended parts to prepare: • Wiring mistake • Faulty PCB • Display board malfunction Troubleshooting and repair: Power off, then restart the unit 2 minutes later.

  • Page 84: Ec (Refrigerant Leakage Detection Diagnosis And Solution)

    EC (Refrigerant Leakage Detection diagnosis and solution) Description: Define the evaporator coil temp.T2 of the compressor just starts running as Tcool. In the beginning 8 minutes after the compressor starts up, if T2<Tcool-1°C does not keep continuous 4 seconds and compressor running frequency higher than 50Hz does not keep continuous 3 minutes, and this situation happens 3 times, the display area will show “EC”...

  • Page 85: 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 86: Solution)

    5.10 P0(IPM malfunction or IGBT over-strong current protection 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: •...

  • Page 87: P1(Over Voltage Or Too Low Voltage Protection Diagnosis And Solution)

    5.11 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 88: P2(High Temperature Protection Of Ipm Module Diagnosis And Solution)

    5.12 P2(High temperature protection of IPM module diagnosis and solution) Description: If the temperature of IPM module is higher than setting 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 89: P4(Inverter Compressor Drive Error Diagnosis And Solution)

    5.13 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 90: Appendix

    Appendix Contents Temperature Sensor Resistance Value Table for T1, T2, T3, and T4 (°C – K) ..87 Temperature Sensor Resistance Value Table for TP (°C – K)......88 iii) Pressure On Service Port ..................89...
  • Page 91 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 92 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 93 iii) Pressure On Service Port(R32) 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 10.3 10.8 75/63 10.9 11.4 80/67 11.4 12.1 90/73 10.7 10.5 10.2 10.8 12.6 13.3 °F(°C) 0(-17) 5(-15) 95 (35) (9.44) (7.22) (23.89)
  • Page 94 Heating chart: 57/53 47/43 37/33 27/23 17/13 (-8.33/ -17/-18 °F(°C) 0/-2(-17/-19) (13.89/11.67) (8.33/6.11) (2.78/0.56) (-2.78/-5) -10.56) (-27/-28) 30.9 29.1 25.8 23.3 21.2 18.9 16.8 33.2 30.6 27.1 25.9 23.8 20.9 19.4 34.5 32.1 28.4 26.8 25.4 21.9 20.4 57/53 47/43 37/33 27/23 17/13 (-8.33/...
  • Page 95 AIR CONDITIONING SYSTEMS wall mounted unit Scan here to download the latest version of this manual. Σαρώστε εδώ για να κατεβάσετε την τελευταία έκδοση του εγχειριδίου.

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