MrCool DIY E Star Series Troubleshooting Manual
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MrCool DIY E Star Series Troubleshooting Manual

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Troubleshooting &
Solutions Guide
4th Generation
DIY
E Star™
Series
®
Due to updates and constantly improving performance, the information and instructions
within this manual are subject to change without notice. Please visit
www.mrcool.com/documentation to ensure you have the latest version of this manual.
Version Date: 10-22-21

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  • Page 1 E Star™ Series ® Due to updates and constantly improving performance, the information and instructions within this manual are subject to change without notice. Please visit www.mrcool.com/documentation to ensure you have the latest version of this manual. Version Date: 10-22-21...

  • Page 2: Table Of Contents

    Troubleshooting Contents Safety Caution .......................3 General Troubleshooting ..................4 Complain Record Form ..................6 Information Inquiry ....................8 Error Diagnosis and Troubleshooting Without Error Code .......11 Remote maintenance ...................11 Field maintenance ..................12 Quick Maintenance by Error Code ..............17 Troubleshooting by Error Code ................18 EH 00 / EC 51 (EEPROM parameter error diagnosis and solution) ...18 EL 01 (Indoor and outdoor unit communication error diag.
  • Page 3 Troubleshooting Contents PC 08 (Overload current protection diagnosis and solution) ....28 PC 00 (IPM malfunction or IGBT over-strong current protection diagnosis and solution) ..................... 29 7.10 PC 01 (Over voltage or too low voltage protection diag. and solution)..30 7.11 PC 02 (High temperature protection of IPM module or high pressure protection diagnosis and solution) ............

  • Page 4: Safety Caution

    1. Safety Caution WARNING Be sure to turn off all power supplies or disconnect all wires to avoid electric shock. While checking indoor/outdoor PCB, please equip oneself with anti-static gloves or wrist strap to avoid damage to the board. WARNING Electricity remains in capacitors even when the power supply is off.

  • Page 5: 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 Timer...
  • Page 6 For other errors: The display board may show a garbled code or a code undefined by the service manual. Ensure that this code is not a temperature reading. Troubleshooting: Test the unit using the remote control. If the unit does not respond to the remote, the indoor PCB requires replacement. If the unit responds, the display board requires replacement.

  • Page 7: Complain Record Form

    3. Complain Record Form Complain Record Form Request No .: Date: Installation Date: Service Date: Customer Information Name Telephone No. Home Address Email Product Information Indoor Unit Model Outdoor Unit Model Serial No. of indoor unit Serial No. of outdoor unit Working Mode □Fan only □Cooling...
  • Page 8 Parameter Checking information by Remote controller Displaying code Displaying code meaning Display value Display value meaning Room temperature Indoor coil temperature Outdoor coil temperature Ambient temperature Outlet temperature of indoor coil Discharge temperature Sunction temperature Targeted Frequency Actual Frequency Indoor fan speed Outdoor fan speed EXV opening steps Compressor continuous...

  • Page 9: Information Inquiry

    4. Information Inquiry • To enter information inquiry status, complete the following procedure within ten seconds: • Press LED (or DO NOT DISTURB) 3 times. • Press SWING (or AIR DIRECTION) 3 times. • Finish 1 and 2 within 10 seconds, you will hear beeps for two seconds, which means the unit goes into parameter checking mode.
  • Page 10 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 11 Displayed Displayed code Explanation Meaning Additional Notes value 0-FF 2-28 Reserved 5-20 5-25 Troubleshooting 10...

  • Page 12: Error Diagnosis And Troubleshooting Without Error Code

    5. 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 TS13 - TS14...

  • Page 13: Field Maintenance

    Field maintenance Problem Solution Unit will not start TS15 - TS16 Compressor will not start but fans run TS15 - TS16 Compressor and condenser (outdoor) fan will not start TS15 - TS16 Evaporator (indoor) fan will not start TS15 - TS16 Condenser (Outdoor) fan will not start TS15 - TS16 Unit runs, but shortly stops...
  • Page 14 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 Unit is on but the wind is not cold (hot) Unit runs, but shortly stops The unit starts up and stops frequently Unit runs con�nuously but insufficient cooling (hea�ng)
  • Page 15 1. Remote Maintenance Others 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 Unit is on but the wind is not cold (hot) Unit runs, but shortly stops The unit starts up and stops frequently Unit runs con�nuously but insufficient cooling (hea�ng)
  • Page 16 2. Field Maintenance Electrical Circuit Possible causes of trouble Unit will not start Compressor will not start but fans run Compressor and condenser (outdoor) fan will not start Evaporator (indoor) fan will not start Condenser (Outdoor) fan will not start Unit runs, but shortly stops Compressor short-cycles due to overload High discharge pressure...
  • Page 17 2.Field Maintenance Refrigerant Circuit Others Possible causes of trouble Unit will not start Compressor will not start but fans run Compressor and condenser (outdoor) fan will not start Evaporator (indoor) fan will not start Condenser (Outdoor) fan will not start Unit runs, but shortly stops Compressor short-cycles due to overload High discharge pressure...

  • Page 18: Quick Maintenance By Error Code

    6. Quick Maintenance by Error Code If you do not have the time to test which 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 EH 00...

  • Page 19: Troubleshooting By Error Code

    7. Troubleshooting by Error Code EH 00 / EC 51 (EEPROM parameter error diagnosis and solution) 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.

  • Page 20: El 01 (Indoor And Outdoor Unit Communication Error Diag. And Solution)

    EL 01 (Indoor and outdoor unit communication error diagnosis and solution) Description: Indoor unit can not communicate with outdoor unit Recommended parts to prepare: • Indoor PCB • Outdoor PCB • Short-circuited component Troubleshooting and repair: Power off, then restart the unit after 2 minutes.
  • Page 21 Remarks: • Use a multimeter to test the DC voltage between 2 port (or S or L2 port) and 3 port (or N or S port) of outdoor unit. The red pin of multimeter connects with 2 port (or S or L2 port) while the black pin is for 3 port (or N or S port) . •...

  • Page 22: Eh 02 (Zero-Crossing Detection Error Diagnosis And Solution)

    EH 02 (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 wires • PCB Troubleshooting and repair: Check the connections and power supply.

  • Page 23: Eh 03 / Ec 07 (Fan Speed Is Operating Outside Of The Normal Range Diagnosis And Solution)

    EH 03 / EC 07 (Fan speed is operating outside of normal range diagnosis and solution) Description: When indoor / outdoor fan speed keeps too low or too high for a certain time, the LED displays the failure code and the AC turns off. Recommended parts to prepare: •...
  • Page 24 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 25 3. Indoor AC Fan Motor Power on and set the unit running in fan mode at high fan speed. After running for 15 seconds, measure the voltage of pin1 and pin2. If the value of the voltage is less than 100V(208~240V power supply) or 50V (115V power supply), the PCB must has problems and need to be replaced.

  • Page 26: Eh 60/Eh 61/Ec 53/Ec 52/Ec 54/Ec 56 (Open Circuit Or Short Circuit Of Temperature Sensor Diagnosis And Solution)

    EH 60/EH 61/EC 53/EC 52/EC 54/EC 56 (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 displays the failure code. Recommended parts to prepare: •...

  • Page 27: Eh 0B (Indoor Pcb / Display Board Communication Error Diagnosis And Solution)

    Note: For certain models, outdoor PCB could not be removed separately. In this case, the outdoor electric control box should be replaced as a whole. This picture and the value are only for reference, actual appearance and value may vary EH 0b (Indoor PCB / Display board communication error diagnosis and solution) Description: Indoor PCB does not receive feedback from the display board.

  • Page 28: El 0C (Refrigerant Leakage Detection Diagnosis And Solution)

    EL 0C (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-1°C(1.8°F) does not keep continuous 4 seconds and compressor running frequency higher than 50Hz does not keep for 3 minutes, and this situation happens 3 times, the LED displays the failure code and AC turns off.

  • Page 29: Pc 08 (Overload Current Protection Diagnosis And Solution)

    PC 08 (Overload current protection diagnosis and solution) Description: An abnormal current rise is detected by checking the specified current detection circuit. Recommended parts to prepare: • Outdoor PCB • Connection wires • Compressor Troubleshooting and repair: Check the power supply . Is it in working order? Stop the unit.

  • Page 30: Pc 00(Ipm Malfunction Or Igbt Over-Strong Current Protection Diagnosis And Solution)

    PC 00(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 LED displays the failure code and the AC turns off. Recommended parts to prepare: •...

  • Page 31: Pc 01 (Over Voltage Or Too Low Voltage Protection Diag. And Solution)

    7.10 PC 01(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 wires • IPM module board •...

  • Page 32: Pc 02(High Temperature Protection Of Ipm Module Or High Pressure Protection Diagnosis And Solution)

    7.11 PC 02(High temperature protection of IPM module or High pressure protection diagnosis and solution) Description: If the temperature of IPM module is higher than a certain value, the LED displays the failure code. For some models with high pressure switch, outdoor pressure switch cut off the system because high pressure is higher than 4.4 MPa, the LED displays the failure code.
  • Page 33 High pressure protection High pressure protection Are the high pressure switch Are the high pressure switch Connect high pressure switch and Connect high pressure switch and and main control boar wired and main control boar wired main control board mian control board correctly? correctly? Is the high pressure...

  • Page 34: Pc 04(Inverter Compressor Drive Error Diagnosis And Solution)

    7.12 PC 04(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: •...

  • Page 35: Pc 03(Low Pressure Protection Diagnosis And Solution)

    7.13 PC 03(Low pressure protection diagnosis and solution) Description: Outdoor pressure switch cut off the system because low pressure is lower than 0.13 MPa, the LED displays the failure code. Recommended parts to prepare: • Connection wires • Outdoor PCB •...
  • Page 36 Low pressure protection Low pressure protection Are the low pressure protector Are the low pressure protector and main control board wired and main control board wired Reconnect the low pressure protector and main Reconnect the low pressure protector and main properly? properly? control board...

  • Page 37: Check Procedures

    8. Check Procedures 8.1 Temperature Sensor Check WARNING Be sure to turn off all power supplies or disconnect all wires to avoid electric shock. Operate after compressor and coil have returned to normal temperature in case of injury. 1. Disconnect the temperature sensor from PCB (Refer to Chapter 5 & 6. Indoor & Outdoor Unit Disassembly). 2.
  • Page 38 Resistance Value ASM135D23UFZ ATQ420D1UMU ASN98D22UFZ ATF235D22UMT ATQ360D1UMU Blue-Red Blue-Black 1.75Ω 0.37Ω Ω 0.75Ω 0.37Ω 1.57 Red-Black Resistance Value ATM115D43UFZ2 ATF250D22UMT ATF310D43UMT KSK103D33UEZ3(YJ) ASM98D32UFZ Blue-Red Blue-Black 1.87Ω 0.75Ω 0.65Ω 2.13Ω 2.2Ω Red-Black Resistance Value ASN140D21UFZ ASK89D29UEZD KSN140D21UFZ KTM240D57UMT KSK103D33UEZ3 Blue-Red Blue-Black 1.28Ω...
  • Page 39 Note: The picture and the value are only for reference, actual condition and specific value may vary. 8.3 IPM Continuity Check WARNING Electricity remains in capacitors even when the power supply is off. Ensure the capacitors are fully discharged before troubleshooting. 1.
  • Page 40 Note: The picture and the value are only for reference, actual condition and specific value may vary. Troubleshooting...
  • Page 41 8.4 4-way Valve Check 1. Power on, use a digital tester to measure the voltage, when the unit operates in cooling, it is 0V. When the unit operates in heating, it is about 230VAC. If the value of the voltage is not in the range, the PCB must have problems and need to be replaced. 2 Turn off the power, use a digital tester to measure the resistance.
  • Page 42 8.5 EXV Check WARNING Electricity remains in capacitors even when the power supply is off. Ensure the capacitors are fully discharged before troubleshooting. 1. Disconnect the connector from outdoor PCB. 2. Measure the resistance value of each winding using a multi-meter. 3.
  • Page 43 Appendix Contents Temperature Sensor Resistance Value Table for T1, T2, T3, and T4 (°C – K) ..2 Temperature Sensor Resistance Value Table for TP (for some units) (°C --K) ..3 iii) Pressure On Service Port ..................4...
  • Page 44 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 45 ii) Temperature Sensor Resistance Value Table for TP (for some units) (°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...
  • Page 46 iii) Pressure On Service Port Cooling chart (R410A): ODU(DB) °F(°C) 0(-17) 5(-15) 95 (35) (-9.44) (7.22) (23.89) (29.44) (40.56) (46.11) (48.89) IDU(DB/WB) 70/59 (21.11/15) 10.1 10.6 75/63 (23.89/17.22) 10.7 11.2 80/67 (26.67/19.44) 11.2 11.9 90/73 (32.22/22.78) 10.5 10.3 10.0 10.6 12.4 13.0 70/59 (21.11/15)
  • Page 47 Heating chart (R410A): ODU(DB/WB) 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) IDU(DB) 55(12.78) 30.3 28.5 25.3 22.8 20.8 18.5 16.5 65(18.33) 32.5 30.0 26.6 25.4 23.3 20.5 19.0 75(23.89) 33.8 31.5 27.8 26.3 24.9...
  • Page 48 Cooling chart (R22): ODU(DB) °F(°C) 0(-17) 5(-15) 95 (35) (-9.44) (7.22) (23.89) (29.44) (40.56) (46.11) (48.89) IDU(DB/WB) 70/59 (21.11/15) 75/63 (23.89/17.22) 80/67 (26.67/19.44) 90/73 (32.22/22.78) 70/59 (21.11/15) 75/63 (23.89/17.22) 80/67 (26.67/19.44) 90/73 (32.22/22.78) 70/59 (21.11/15) 0.40 0.41 0.46 0.50 0.51 0.49 0.51 0.54...
  • Page 49 Heating chart (R22): ODU(DB/WB) 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) IDU(DB) 55(12.78) 18.9 17.8 15.8 14.3 13.0 11.6 10.3 65(18.33) 20.3 18.8 16.6 15.9 14.6 12.8 11.9 75(23.89) 21.1 19.7 17.3 16.4 15.6...
  • Page 50 Cooling chart (R32): ODU(DB) °F(°C) 0(-17) 5(-15) 95 (35) (-9.44) (7.22) (23.89) (29.44) (40.56) (46.11) (48.89) IDU(DB/WB) 70/59 (21.11/15) 10.3 10.8 75/63 (23.89/17.22) 10.9 11.4 80/67 (26.67/19.44) 11.4 12.1 90/73 (32.22/22.78) 10.7 10.5 10.2 10.8 12.6 13.3 70/59 (21.11/15) 75/63 (23.89/17.22) 80/67 (26.67/19.44) 90/73 (32.22/22.78) 70/59 (21.11/15)
  • Page 51 Heating chart (R32): ODU(DB/WB) 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) IDU(DB) 55(12.78) 30.9 29.1 25.8 23.3 21.2 18.9 16.8 65(18.33) 33.2 30.6 27.1 25.9 23.8 20.9 19.4 75(23.89) 34.5 32.1 28.4 26.8 25.4...
  • Page 52 System Pressure Table-R22 Pressure Temperature Pressure Temperature °C °F °C °F 14.5 -41.091 -41.964 1600 41.748 107.146 21.75 -32.077 -25.739 1650 16.5 239.25 43.029 109.452 -25.177 -13.319 1700 246.5 44.281 111.706 36.25 -19.508 -3.114 1750 17.5 253.75 45.506 113.911 43.5 -14.654 5.623 1800...
  • Page 53 System Pressure Table-R410A Pressure Temperature Pressure Temperature °C °F °C °F 14.5 -51.623 -60.921 2350 23.5 340.75 38.817 101.871 21.75 -43.327 -45.989 2400 39.68 103.424 -36.992 -34.586 2450 24.5 355.25 40.531 104.956 36.25 -31.795 -25.231 2500 362.5 41.368 106.462 43.5 -27.351 -17.232 2550...
  • Page 54 System Pressure Table-R32 Pressure Temperature Pressure Temperature °C °F °C °F 14.5 -51.909 -61.436 1850 18.5 268.25 28.425 83.165 21.75 -43.635 -46.543 1900 275.5 29.447 85.005 -37.323 -35.181 1950 19.5 282.75 30.448 86.806 36.25 -32.15 -25.87 2000 31.431 88.576 43.5 -27.731 -17.916 2050...
  • Page 55 4th Generation E Star™ Series ®...

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