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M Design ACP-09CH25AEMI/I Service Manual

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SERVICE MANUAL
M DESIGN, INVERTER SERIES
2017 SERVICE MANUAL

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Summary of Contents for M Design ACP-09CH25AEMI/I

  • Page 1 SERVICE MANUAL M DESIGN, INVERTER SERIES 2017 SERVICE MANUAL...

  • Page 3: Table Of Contents

    Table of Contents Page 1. Safety Precautions ..................1 In case of Accidents or Emergency Pre-Installation and Installation Operation and Maintenance 2. Specifications ....................3 Model Reference Electrical Wiring Diagrams 3. Product Features ................... 9 Operation Modes and Functions 4. Maintenance and Disassembly ..............17 Maintenance Disassembly 5.

  • Page 5: Safety Precautions

    Safety Precautions Contents In Case of Accidents or Emergency ..............2 Pre-Installation.......................2 Operation and Maintenance.................2...

  • Page 6: In Case Of Accidents Or Emergency

    To prevent personal injury, or property or unit damage, adhere to all precautionary measures and instructions CAUTION outlined in this manual. Before servicing a unit, refer to this •• While unpacking be careful of sharp edges around service manual and its relevant sections. the unit as well as the edges of the fins on the con- denser and evaporator.

  • Page 7: Specifications

    Specifications Contents Model Reference....................4 Electrical Wiring Diagrams ..................5 Indoor Unit ....................5 Outdoor Unit ....................7...

  • 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 ACP-09CH25AEMI/I ACP-09CH25AEMI/O ACP-12CH35AEMI/I ACP-12CH35AEMI/O 220-240V~, 50Hz, 1Phase ACP-18CH50AEMI/I...

  • Page 9: Electrical Wiring Diagrams

    2. Electrical Wiring Diagrams Indoor unit Abbreviation Paraphrase Yellow-Green Conductor Positive and Negative Ion Generator Capacitor PLASMA Electronic Dust Collector to CCM Comm.Bus Central Controller (for CAC) X Y E 485 Communication Line LIVE NEUTRAL Heater The Electric Heating Belt of Indoor Unit Indoor Room Temperature Coil Temperature of Indoor Heat Exchanger Middle Coil Temperature of Condenser...
  • Page 10 ACP-09CH25AEMI/I ; ACP-12CH35AEMI/I; ACP-18CH50AEMI/I; ACP-24CH70AEMI/I 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 OPTIONA L Applicalbe for MONO unit with...
  • Page 11 Outdoor Unit Abbreviation Paraphrase 4-WA Y 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 ACP-09CH25AEMI/O; ACP-12CH35AEMI/O,; ACP-18CH50AEMI/O BLUE OR BLACK BROWN 1(L) 2(N) I N D O O R U N I T 4 -WAY CRANKCASE...
  • Page 12 ACP-18CH50AEMI/O; ACP-24CH70AEMI/O 16022000019069 Applicable to Applicable to the units adopting the units adopting DC motor only AC motor only OPTIONAL H EATER 2 C N 4( C N 5) HE ATER 1 OPTIONAL: CN30 BLUE （ YELLOW ） BLACK(BLUE) TO I NDO O R UNI T PO W ER SUPPLY ...

  • Page 13: Product Features

    Product Features Contents Operation Modes and Functions ................10 Abbreviation....................10 Safety Features ....................10 Display Function ..................11 Fan Mode ....................11 Cooling Mode .....................11 Heating Mode .....................12 Auto- mode....................12 Drying Mode ....................12 Forced Operation Function ................12 1.10 Sleep Function .....................13 1.11 Auto-Restart Function..................13 1.12 Refrigerant Leakage Detection ..............13...
  • Page 14 ..................13 1.17 Information Inquiry ..................13...

  • Page 15: Operation Modes And Functions

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

  • Page 16: Display Function

    • For ACP-18CH50AEMI/I & MSAFDU- 24HRFN1-QRD0GW, The outdoor unit will be run at different fan speed according to T4. • For ACP-09CH25AEMI/I, MSAFBU- 12HRDN1-QRD0GW and MSAFCU-18HRFN1- QRD0GW(S1) , The outdoor unit will be run at different fan speed according to T4 and compressor frequency.

  • Page 17: Heating Mode

    • When T1-Ts>-∆T, the compressor ceases operation. • T3 maintained above TCDE2°C for 80 seconds. • When T1-TS<∆T-1.5°C, the compressor continues • For ACP-09CH25AEMI/I, ACP-12CH35AEMI/I and operation. • When the AC is operating in mute mode, the ACP-18CH50AEMI/I , unit runs for 15 minutes compressor operates at a low frequency.

  • Page 18: Sleep Function

    • All protections are active and the same as that in • the swing setting) and, in the case of a sudden power cooling mode. failure, will restore those setting automatically within 3 minutes after power returns. • If the unit was in forced cooling mode, it will run in this Forced operation function mode for 30 minutes and turn to auto mode with temperature set to 24°C.
  • Page 19 Press “Silence” on the remote control to enable the SILENCE function. While this function is active, the compressor frequency is maintained at a lower level than F2. The indoor unit will run at faint breeze, which reduces noise to the lowest possible level. Information Inquiry •...
  • Page 20 Displayed Displayed code Explanation Meaning Additional Notes value Room temperature All displayed temperatures use actual values. Indoor coil temperature All temperatures are displayed in °C Outdoor coil regardless of remote temperature used. -1F,-1E,-1d,-1c,- -25,-24,-23,-22, T1, T2, T3, T4, and Ambient 1b,-1A -21,-20 T2B display ranges...
  • Page 21 Displayed Displayed code Explanation Meaning Additional Notes value 0-FF 2-28 Reserved 5-20 5-25  Page 16 ...
  • Page 22 Maintenance and Disassembly Contents Maintenance ......................18 First Time Installation Check ................18 Refrigerant Recharge ...................20 Re-Installation .....................21 1.3.1 Indoor Unit ..................21 1.3.2 Outdoor Unit ................23 Disassembly ......................25 Indoor Unit ....................25 Outdoor Unit ....................37...

  • 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: • If the pressure does not achieve -0.1 MPa Tighten the flare nuts of the indoor and outdoor units, and confirm that both the 2- and 3-way valves are (14.5 Psi) after 50 minutes, check for leakage. closed. • If the pressure successfully reaches -0.1 MPa Connect the charge hose with the push pin of Handle (14.5 Psi), fully close the Handle Lo valve and Lo to the gas service port of the 3-way valve.

  • Page 25: Refrigerant Recharge

    Refrigerant Recharge (2OW[OJ YOJK ) (5[ZJUUX [TOZ) (/TJUUX [TOZ) :]U-]G_ \GR\K 5VKT (-GY YOJK) :NXKK-]G_ \GR\K )NKIQ \GR\K 5VKT )NGXMOTM I_ROTJKX 56+4 )259+ +RKIZXUTOI YIGRK Prior to recharging the refrigerant, confirm the additional amount of refrigerant required using the following table: Models Standard length Max.

  • Page 26: Re-Installation

    Re-Installation 1.3.1 Indoor Unit Collecting the refrigerant into the outdoor unit (5[ZJUUX [TOZ) (2OW[OJ YOJK) (/TJUUX [TOZ) :]U-]G_ \GR\K )RUYK (-GY YOJK) :NXKK-]G_ \GR\K 5VKT )RUYK )RUYK Procedure: Confirm that the 2- and 3-way valves are opened. Operate the air conditioner in cooling mode. Cease operations when the gauge reaches 0.1 MPa Remove the valve stem caps and ensure that the valve (14.5 Psi).
  • Page 27 Air purging with vacuum pump (2OW[OJ YOJK) (/TJUUX [TOZ) (5[ZJUUX [TOZ) :]U-]G_ \GR\K )RUYK (-GY YOJK) 3GTOLURJ \GR\K :NXKK-]G_ \GR\K )USVU[TJ SKZKX 6X KYY[ XK )RUYK MG[MK -O.l36G .GTJRK 2U .GTJRK .O )NGXMK NUYK )NGXMK NUYK <GI[[S V[SV <GI[[S V[SV Procedure: •...

  • Page 28: Outdoor Unit

    1.3.2 Outdoor Unit Evacuation for the whole system (2OW[OJ YOJK) (/TJUUX [TOZ) (5[ZJUUX [TOZ) :]U-]G_ \GR\K 5VKT (-GY YOJK) :NXKK-]G_ \GR\K 5VKT 56+4 <GI[[S V[SV )259+ Procedure: Confirm that the 2- and 3-way valves are opened. Close the valve (Low side) on the charge set and turn off the vacuum pump.
  • Page 29 Refrigerant charging (2OW[OJ YOJK ) (5[ZJUUX [TOZ) (/TJUUX [TOZ) :]U-]G_ \GR\K 5VKT (-GY YOJK) :NXKK-]G_ \GR\K )NKIQ \GR\K 5VKT )NGXMOTM I_ROTJKX 56+4 )259+ +RKIZXUTOI YIGRK Procedure: Connect the charge hose to the 3-way service port Open the valves (Low side) on the charge set and and then open the 2- and the 3-way valves.

  • 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 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 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 29 ...
  • 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_ INV_009). Electronic Cover 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 32 ...
  • Page 38 Evaporator Note: Remove the front panel and electrical parts (refer to 1. Front panel and 2. Electrical parts) befor e 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_...
  • 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 34 ...
  • 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) befor e 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.

  • Page 42: Outdoor Unit

    Outdoor unit Panel Plate ACP-09CH25AEMI/O; ACP-12CH35AEMI/O: 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 (3 screws) (see CJ_BA30_INV_001). CJ_BA30_INV_001 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 (7 screws) (see CJ_BA30_INV_003). Front Panel CJ_BA30_INV_003 5) Remove the screws of the rear net and then remove the rear net (2 screws) (see CJ_BA30_INV_004). CJ_BA30_INV_004 Note: This section is for reference only.
  • Page 44 Procedure Illustration 6) Remove the screws of the right panel and then remove the right panel (5 screws) (see CJ_BA30_INV_005). Right Panel CJ_BA30_INV_005 Note: This section is for reference only. Actual unit appearance may vary.  Page 39 ...
  • Page 45 ACP-18CH50AEMI/O, ACP-18CH50AEMI/O 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 (3 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 4) 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 5) 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 6) Remove the screws of the right panel and then remove the right panel (5 screws) (see CJ_B30_INV_005). Right Panel CJ_B30_INV_005 Note: This section is for reference only. Actual unit appearance may vary.  Page 42 ...
  • Page 48 ACP-24CH70AEMI/O: 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 (3 screws) (see CJ_CA30_INV_001). Big Handle 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 Water Collecting Cover cover and then remove the water collecting cover (1 screw) (see CJ_ CA30_INV_004).
  • Page 50 Procedure Illustration 6) 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 45 ...
  • Page 51 Fan disassembly Note: Remove the panel plate and (refer to 1. Panel plate) before disassembling fan. ACP-09CH25AEMI/O; ACP-12CH35AEMI/O; ACP-18CH50AEMI/O: MOB32- 18HFN1-QRD0GW(S1) Procedure Illustration 1) Remove the nut securing the fan CJ_ODU_ with a spanner (see INV_001 2) Remove the fan. CJ_ODU_INV_001 D-cut 3) Remove the screws of the top cover.
  • Page 52 Procedure Illustration 5) Disconnect the connector for fan motor from the electronic control board (see CJ_ODU_INV_004 Fan Motor 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.
  • Page 53 ACP-24CH70AEMI/O: 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) 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 Fan Motor 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. Fan Motor CJ_ODU_INV_009 Note: This section is for reference only.
  • Page 55 Electrical parts Note: Remove the panel plate and fan assembly (refer to 1. Panel plate and 2. Fan assembly) befor e disassembling electrical parts. ACP-09CH25AEMI/O; ACP-12CH35AEMI/O; ACP-18CH50AEMI/O; MOB32- 18HFN1-QRD0GW(S1) : Procedure Illustration 1) Remove the connector for the CJ_ODU_INV_010 compressor (see 4-Way Valve 2) Pull out the two blue wires connected CJ_ODU_...
  • Page 56 ACP-24CH70AEMI/O: Procedure Illustration 4-Way Valve 1) Remove the connector for the CJ_ODU_INV_011 compressor (see Heaters 2) Pull out the two blue wires connected CJ_ODU_ with the four way valve (see INV_011 Reactor 3) Pull out connectors of the condenser coil temp. sensor(T3),outdoor ambient temp.
  • Page 57 Reactor(for 18k and 24k) 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 2 screws of the reactor and then remove the reactor (see CJ_ODU_INV_012 CJ_ODU_INV_012...
  • Page 58 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 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 termianal cover (see ODU_INV_015 Terminal Cover...
  • Page 60 Procedure Illustration 3) Remove the hex nuts and washers securing the compressor, located on the bottom plate CJ_ODU_INV_017 (see CJ_ODU_INV_017 Suction Pipe 4) Heat up the brazed parts and then remove the the discharge pipe and the suction pipe (see CJ_ODU_INV_018 5) Lift the compressor from the base pan assembly with pliers.
  • Page 61 Troubleshooting Contents Safety Caution .....................58 General Troubleshooting ..................59 Error Diagnosis and Troubleshooting Without Error Code.......60 Remote maintenance...................60 Field maintenance ..................61 Quick Maintenance by Error Code..............62 Troubleshooting by Error Code................67 Common Check Procedures.................67 E0/F4 (EEPROM parameter error) ..............69 E1 (Indoor and outdoor unit communication error) ........70 E3/F5 (Fan speed is operating outside of the normal range diagnosis and solution) ......................72...
  • Page 62 Contents 5.10 P1(Over voltage or too low voltage protection diagnosis and solution) ..79 5.11 P2(High temperature protection of IPM module diagnosis and solution) ..80 5.12 P4(Inverter compressor drive error diagnosis and solution) ......81...

  • Page 63: Safety Caution

    1. Safety Caution WARNING Electricity remains in capacitors even when the power supply is off. Ensure the capacitors are fully discharged before t rouble s hoo t ing. 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 64: General Troubleshooting

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

  • Page 65: 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 63-64...

  • Page 66: Field Maintenance

    Field maintenance Problem Solution Unit will not start Page 65-66 Compressor will not start but fans run Page 65-66 Compressor and condenser (outdoor) fan will not start Page 65-66 Evaporator (indoor) fan will not start Page 65-66 Condenser (Outdoor) fan will not start Page 65-66 Unit runs, but shortly stops Page 65-66...

  • 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 1.Remote M aint e na nce Electrical C i rc uit Refrigerant C i rc uit Possible causes of t r oubl e Uni t wi l l not s ta rt ☆ ☆ ☆ ☆ Opera ti on i s erra ti c, unpredi cta bl e, or uni t i s unres pons i ve ☆...
  • 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 Electrical Circuit 2.Field Maintenance Possible causes of trouble Uni t wi l l not s ta rt ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ ☆ Compres s or wi l l not s ta rt but fa ns run ☆...
  • 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: • 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 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: • Indoor PCB • Outdoor PCB • 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 71 ...

  • Page 77: E3/F5 (Fan Speed Is Operating Outside Of The Normal Range Diagnosis And Solution)

    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 78 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 79: E4/E5/F1/F2/F3 (Open Circuit Or Short Circuit Of Temperature Sensor Diagnosis And Solution)

    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 80: 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 81: 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-2°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 82: 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 83: P0(Ipm Malfunction Or Igbt Over-Strong Current Protection Diagnosis And Solution)

    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: • Wiring mistake •...
  • Page 84 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 85 5.11 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 86 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 87 Contents Temperature Sensor Resistance Value Table for T1, T2, T3, and T4 (°C – K) ..83 Temperature Sensor Resistance Value Table for TP (°C – K)......84...
  • Page 88 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 89 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...

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