Kaisai FLY INVERTER Series Service Manual
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Kaisai FLY INVERTER Series Service Manual

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R32 UNITS SERVICE MANUAL
KAISAI FLY
INVERTER SERIES
IMPORTANT NOTE:
Read this manual carefully before installing or operating your new air conditioning unit.
Make sure to save this manual for future reference.

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Summary of Contents for Kaisai FLY INVERTER Series

  • Page 1 R32 UNITS SERVICE MANUAL KAISAI FLY INVERTER SERIES IMPORTANT NOTE: Read this manual carefully before installing or operating your new air conditioning unit. Make sure to save this manual for future reference.

  • Page 2: 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 3: Safety Precautions

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

  • Page 4: Precautions

    Only a qualified electrician should perform electri- • When the unit is not to be used for an extended time, cal work. For more information, contact your dealer, disconnect the power supply or turn off the breaker. seller, or an authorized KAISAI service center. Page 2...

  • Page 5: 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 6 • 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 7 • 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 8 • 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 9: Specifications

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

  • Page 10: 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 KWX-09HRDO KWX-09HRDI KWX-12HRDI KWX-12HRDO 220-240V~, 50Hz, KWX-18HRDI KWX-18HRDO 1Phase KWX-24HRDI KWX-24HRDO...

  • Page 11: 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 9...
  • Page 12 OPTIONAL Applicable INDOOR WIRING DIAGRAM to AC motor only 16022000020169 CN701 OPTION 12V/5 OPTIONAL OPTIONA KWX-09HRDI KWX-12HRDI KWX-18HRDI KWX-24HRDI Page 10...

  • Page 13: 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 KWX-09/12/18HRDO BLUE OR BLACK BROW 1(L) 2(N) S L N OPTION AL: DC-...
  • Page 14 KWX-24HRDO 16022000019 Applicable to Applicable to the units the units adopting DC adopting AC motor only motor only HEATER 2 C N 4 HEA TER BROWN BLACK(BL Page 12...

  • Page 15: 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 ..................

  • Page 16: 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 corresponding error code, allowing for emergency use.

  • Page 17: 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 18: 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 • The sleep function is available in cooling, heating, or 17°C~30°C. auto mode. • In auto mode, the machine selects cooling, heating, or fan-only mode on the basis of T (T =T1-Ts).

  • Page 19: 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 20 Displayed Displayed code Explanation Meaning Additional Notes value Room temperature All displayed temperatures use actual values. Indoor coil temperature 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 T1, T2, T3, T4, and T2B Ambient A0,A1,…A9 100,101,…109...
  • Page 21 Displayed Displayed code Explanation Meaning Additional Notes value 0-FF 2-28 Reserved 5-20 5-25 Page 19...

  • Page 22: 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 23: 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 24 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 25: 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 26: 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 27 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 28: 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 29 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 30: 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 31 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 32 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 30...
  • Page 33 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 31...
  • Page 34 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 32...
  • Page 35 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 36 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 37 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 38 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 39 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 40 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 41 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 39...

  • Page 42: Outdoor Unit

    Outdoor unit Panel Plate KWX-09/12HRDO, 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 43 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 44 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 45 KWX-18HRDO, 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 46 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 47 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 48 KWX-24HRDO 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 49 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 50 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 51 Fan disassembly Note: Remove the panel plate and (refer to 1. Panel plate) before disassembling fan. KWX-09/12/18HRDO, 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. CJ_ODU_INV_002 (2 screws) (see CJ_ODU_INV_002...
  • Page 52 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 CJ_ODU_INV_005 (4 screws) (see 7) Remove the fan motor. Fan Motor CJ_ODU_INV_005 Note: This section is for reference only. Actual unit appearance may vary. Page 50...
  • Page 53 KWX-24HRDO Procedure Illustration 1) Remove the nut securing the fan CJ_ODU_ with a spanner (see 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) CJ_ODU_INV_007 (see CJ_ODU_INV_007 Note: This section is for reference only.
  • Page 54 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 CJ_ODU_INV_009 (4 screws) (see 6) Remove the fan motor. CJ_ODU_INV_009 Note: This section is for reference only. Actual unit appearance may vary. Page 52...
  • Page 55 Electrical parts Note: Remove the panel plate and fan assembly (refer to 1. Panel plate and 2. Fan assembly) before disassembling electrical parts. KWX-09/12/18HRDO, 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 CJ_ODU_ with the four way valve ( INV_010...
  • Page 56 KWX-24HRDO Procedure Illustration 1) Remove the connector for the 4-Way Valve CJ_ODU_INV_011 compressor (see 2) Pull out the two blue wires connected Reactor CJ_ODU_ with the four way valve (see INV_011 3) Pull out connectors of the condenser coil temp. sensor(T3),outdoor ambient temp.
  • Page 57 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 CJ_ODU_INV_012...
  • Page 58 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 59 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 ODU_INV_014 Terminal Cover...
  • Page 60 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 CJ_ODU_INV_017 pipe (see 5) Lift the compressor from the base pan Discharge Pipe assembly with pliers.

  • Page 61: 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 ..............
  • Page 62 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 63: Safety Caution

    1. Safety Caution 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.100 40W) or a soldering iron plug between the positive a n d negative terminals of the electrolytic capacitor.

  • Page 64: 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 65: Error Diagnosis And Troubleshooting Without Error Code

    3. Error Diagnosis and Troubleshooting Without Error Code 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 The power switch is on but fans will not start...

  • Page 66: 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 67: 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 68 Test voltage Power failure Close the power switch The main power tripped Inspect connections - tighten Loose connections Change the transformer Faulty transformer Test voltage The voltage is too high or too low Replace the battery of the remote control The remote control is powered off Replace the remote control Broken remote control...
  • Page 69 Check heat load Heavy load condition Tighten bolts or screws Loosen hold down bolts and / or screws Close all the windows and doors Bad airproof Remove the obstacles The air inlet or outlet of either unit is blocked Reconnect the power or press ON/OFF Interference from cell phone towers and remote button on remote control to restart boosters...
  • Page 70 Test voltage Power failure Inspect fuse type & size Blown fuse or varistor Inspect connections - tighten Loose connections Test circuits with tester Shorted or broken wires Test continuity of safety device Safety device opens Test continuity of thermostat / sensor & wiring Faulty thermostat / room temperature sensor Place the temperature sensor at the central of Wrong setting place of temperature sensor...
  • Page 71 Replace the compressor Compressor stuck Leak test Shortage of refrigerant Replace restricted part Restricted liquid line Clean or replace Dirty air filter Clean coil Dirty evaporator coil Check fan Insufficient air through evaporator coil Change charged refrigerant volume Overcharge of refrigerant Clean condenser or remove obstacle Dirty or partially blocked condenser Purge, evacuate and recharge...

  • Page 72: 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 73 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 74: 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: Is it still displaying the error code? If the EEPROM chip is welded on main PCB, replace the main PCB directly.

  • Page 75: 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 76 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 77: 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 78: 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 79 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 80: 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 81: 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 82: 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 83: 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: Is it in working order? Stop the unit.

  • Page 84: 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 85: 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 86: 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 87: 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 88: 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 89 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 90 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 °C °F °C °F °C °F K Ohm K Ohm K Ohm K Ohm 542.7 68.66...
  • Page 91 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 92 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/...

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