MrCool Advantage A HP-WMAH-115D25-O Series Service Manual
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MrCool Advantage A HP-WMAH-115D25-O Series Service Manual

MrCool Advantage A HP-WMAH-115D25-O Series Service Manual

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Advantage Series
MODELS:
A-*-HP-WMAH-115D25-O
A-*-HP-WMAH-230D25-O
A-*-HP-C-115D25-O
A-*-HP-C-230D25-O
Read this manual carefully before installation and keep it where
the operator can easily find it for future reference.
Due to updates and constantly improving performance, the
information and instructions within this manual are subject to
change without notice.
Version Date: March 11, 2025
Please visit www.mrcool.com/documentation
to ensure you have the latest version of this manual.
This product utilizes R-454B refrigerant
SERVICE MANUAL

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Summary of Contents for MrCool Advantage A HP-WMAH-115D25-O Series

  • Page 1 Due to updates and constantly improving performance, the information and instructions within this manual are subject to change without notice. Version Date: March 11, 2025 Please visit www.mrcool.com/documentation to ensure you have the latest version of this manual.

  • Page 2: Table Of Contents

    5.5 Information Inquiry & Setting ................59 5.6 Error Diagnosis Without Error Code ..............64 5.7 Quick Maintenance by Error Code ..............71 5.8 Troubleshooting by Error Code ............... 73 5.9 Check Procedures .................... 102 TEMPERATURE SENSOR RESISTANCE TABLE .............. 109 SYSTEM PRESSURE TABLE..................... 111 mrcool.com...

  • Page 3: Safety

    8. For units with a wireless network function, the USB device access, replacement, and maintenance operations must be carried out by professional staff. 9. Refer to details further in this manual regarding installing the unit to its support. mrcool.com...
  • Page 4 Call your local dealer, or MRCOOL® tech support at (270) 366-0457, for further assistance. 2. If the air conditioner is used together with burners or other heating devices, thoroughly ventilate the room in order to avoid an oxygen deficiency.
  • Page 5 3. Service, maintenance, and repair of this unit must be performed by a certified technician. 4. Product un-installation and recycling must be performed by a certified technician. 5. When checking the unit for leaks, maintain proper record-keeping of all checks. mrcool.com...
  • Page 6 22. Ensure that the area is in the open or that it is adequately ventilated before breaking into the system or conducting any hot work. A degree of ventilation shall continue during the period that the work is carried out. The ventilation should safely disperse any released refrigerant and preferably expel it externally into the atmosphere. mrcool.com...
  • Page 7 The following procedure should be adhered to: • safely remove refrigerant following local and national regulations; • evacuate; • purge the circuit with inert gas; • evacuate; • continuously flush or purge with inert gas when using flame to open circuit; • open the circuit mrcool.com...
  • Page 8 Equipment shall be labeled stating that it has been decommissioned and emptied of refrigerant. The label should be dated and signed. For appliances containing flammable refrigerants, ensure that there are labels on the equipment stating the equipment contains flammable refrigerant. mrcool.com...
  • Page 9 This symbol shows that the operation manual should be read carefully. CAUTION This symbol shows that a service personnel should be handling this equipment with reference to the installation manual. CAUTION This symbol shows that information is available such as the operating manual or CAUTION installation manual. mrcool.com...
  • Page 10 Anvmin shall not be less than the following: • Height of Outlet/m Mc/kg Mmax/kg Anvmin/m 2.685 0.045 2.941 0.042 3.177 0.038 3.396 0.035 3.602 0.031 3.797 0.028 3.983 0.024 4.160 0.020 4.330 0.016 4.493 0.013 4.651 0.009 4.803 0.005 4.951 0.001 mrcool.com...

  • Page 11: System Overview

    Oil traps in the rising gas pipe can prevent this. • An oil trap should be installed every 20ft (6m) of vertical suction line (< 36000Btu/h unit). • An oil trap should be installed every 32.8ft (10m) of vertical suction line (≥36000Btu/h unit). mrcool.com...

  • Page 12: Air Velocity And Temperature Distributions

    SYSTEM OVERVIEW 2.3 Air Velocity and Temperature Distributions A-09-HP-WMAH-*D-O: Cooling (Indoor: 80.6°F /27°C Outdoor: 95°F /35°C) Discharge angle 58° Airflow Velocity Distributions Temperature Distributions mrcool.com...
  • Page 13 SYSTEM OVERVIEW A-09-HP-WMAH-*D-O: Heating (Indoor: 68°F /20°C Outdoor: 44.6°F /7°C) Discharge angle 90° Airflow Velocity Distributions Temperature Distributions mrcool.com...
  • Page 14 SYSTEM OVERVIEW A-12-HP-WMAH-*D-O: Cooling (Indoor: 80.6°F /27°C Outdoor: 95°F /35°C) Discharge angle 58° Airflow Velocity Distributions Temperature Distributions mrcool.com...
  • Page 15 SYSTEM OVERVIEW A-12-HP-WMAH-*D-O: Heating (Indoor: 68°F /20°C Outdoor: 44.6°F /7°C) Discharge angle 90° Airflow Velocity Distributions Temperature Distributions mrcool.com...
  • Page 16 SYSTEM OVERVIEW A-18-HP-WMAH-230D-O: Cooling (Indoor: 80.6°F /27°C Outdoor: 95°F /35°C) Discharge angle 50° Airflow Velocity Distributions Temperature Distributions mrcool.com...
  • Page 17 SYSTEM OVERVIEW A-18-HP-WMAH-230D-O: Heating (Indoor: 68°F /20°C Outdoor: 44.6°F /7°C) Discharge angle 84° Airflow Velocity Distributions Temperature Distributions mrcool.com...
  • Page 18 SYSTEM OVERVIEW A-24-HP-WMAH-230D-O: Cooling (Indoor: 80.6°F /27°C Outdoor: 95°F /35°C) Discharge angle 50° Airflow Velocity Distributions Temperature Distributions mrcool.com...
  • Page 19 SYSTEM OVERVIEW A-24-HP-WMAH-230D-O: Heating (Indoor: 68°F /20°C Outdoor: 44.6°F /7°C) Discharge angle 77° Airflow Velocity Distributions Temperature Distributions mrcool.com...
  • Page 20 SYSTEM OVERVIEW A-36-HP-WMAH-230D-O: Cooling (Indoor: 80.6°F /27°C Outdoor: 95°F /35°C) Discharge angle 55° Airflow Velocity Distributions Temperature Distributions mrcool.com...
  • Page 21 SYSTEM OVERVIEW A-36-HP-WMAH-230D-O: Heating (Indoor: 68°F /20°C Outdoor: 44.6°F /7°C) Discharge angle 75° Airflow Velocity Distributions Temperature Distributions mrcool.com...

  • Page 22: Refrigerant Cycle Diagrams

    SYSTEM OVERVIEW 2.4 Refrigerant Cycle Diagrams A-09-HP-C-115D-O, A-09-HP-C-230D-O A-12-HP-C-115D-O, A-12-HP-C-230D-O A-18-HP-C-230D-O mrcool.com...
  • Page 23 SYSTEM OVERVIEW A-24-HP-C-230D-O A-36-HP-C-230D-O mrcool.com...

  • Page 24: Electrical Wiring Diagrams

    A-09-HP-WMAH-230D-O A-09-HP-C-230D-O A-12-HP-WMAH-230D-O 16022000041530 A-12-HP-C-230D-O 16022000040610 A-18-HP-WMAH-230D-O A-18-HP-C-230D-O A-24-HP-WMAH-230D-O A-24-HP-C-230D-O 16022000040790 A-36-HP-WMAH-230D-O A-36-HP-C-230D-O 16022000040650 Outdoor Unit Printed Circuit Board Diagram: Outdoor Unit ODU Model ODU Printed Circuit Board A-09-HP-C-115D-O 17122000062141 A-12-HP-C-115D-O A-09-HP-C-230D-O A-12-HP-C-230D-O 17122000057661 A-18-HP-C-230D-O A-24-HP-C-230D-O 17122000048064 A-36-HP-C-230D-O 17122300007152 mrcool.com...
  • Page 25 SYSTEM OVERVIEW Indoor unit wiring diagram: 16022000041530 mrcool.com...
  • Page 26 SYSTEM OVERVIEW Outdoor unit wiring diagram: 16022000040773 mrcool.com...
  • Page 27 SYSTEM OVERVIEW Outdoor unit wiring diagram: 16022000040610 mrcool.com...
  • Page 28 SYSTEM OVERVIEW Outdoor unit wiring diagram: 16022000040790 mrcool.com...
  • Page 29 SYSTEM OVERVIEW Outdoor unit wiring diagram: 16022000040650 mrcool.com...
  • Page 30 SYSTEM OVERVIEW Outdoor unit printed circuit board diagram: 17122000062141 mrcool.com...
  • Page 31 L_in: connects to L-line (115VAC input) CN1A N_in: connects to N-line (115VAC input) Earth Connects to compressor .0VAC (standby), 0-310VAC CN50 (running) CN4_2 REACTOR Connects to reactor, 115VAC when is ON CN4_3 Note: This section is for reference only. Please take practicality as standard. mrcool.com...
  • Page 32 SYSTEM OVERVIEW Outdoor unit printed circuit board diagram: 17122000057661 mrcool.com...
  • Page 33 CN16 S: connects to indoor unit communication L_in: connects to L-line (230VAC input) CN1A N_in: connects to N-line (230VAC input) Earth CN50 Connects to compressor (Output: 0-310VAC) Note: This section is for reference only. Please take practicality as standard. mrcool.com...
  • Page 34 SYSTEM OVERVIEW Outdoor unit printed circuit board diagram: 17122000048064 & 17122000048066 mrcool.com...
  • Page 35 Used for testing FAN_IPM IPM501 IPM for DC fan COMP_IPM IPM1 IPM for compressor CN27 CN28 Connects to compressor (Output: 0~310VAC) CN29 EE_PORT CN505 EEPROM programmer port Note: This section is for reference only. Please take practicality as standard. mrcool.com...
  • Page 36 SYSTEM OVERVIEW Outdoor unit printed circuit board diagram: 17122300007152 mrcool.com...
  • Page 37 Connect to key board CN1 Connect to condenser coil temp. sensor T3, ambient T3 T4 TP CN26 temp. sensor T4, exhaust temp. sensor TP (Output: 0~5VDC) Connect to high and low pressure switch (pin1-pin2&pin3- H-PRO, L-PRO CN29 pin4:5VDC pulse wave) mrcool.com...
  • Page 38 Connect to electric expansion valve (Output: 0~12VDC) EEVF EEV1 CN53 EEV2 CN44 EEV3 H_YL CN49 Connect to high pressure sensor DC-FAN2 CN10 Connect to DC fan (Output 0~310VAC) Note: This section is for reference only. Please take practicality as standard. mrcool.com...

  • Page 39: Product Features

    Preheating is automatically activated when T4 sensor is lower than setting temperature. Sensor redundancy and automatic shutoff • If one temperature sensor malfunctions, the air conditioner continues operation and displays the corresponding error code, allowing for emergency use. • When more than one temperature sensor is malfunctioning, the air conditioner ceases operation. mrcool.com...

  • Page 40: Basic Functions

    The indoor fan speed can be set to 1%-100%, or auto. • The louver operations are identical to those in cooling mode. • Auto fan: In fan-only mode, AC operates the same as auto fan in cooling mode with the temperature set at 75°F (24°C). (Tsc=75°F (24°C)). mrcool.com...

  • Page 41: Indoor Fan Control

    For AC Fan Motor Units: a configured value, the compressor ceases operation. Evaporator Temperature Protection: • Off: Compressor stops. • Decrease: Decreases the running frequency to lower level per 1 minute. • Hold: Keep the current frequency. • Resume: No limitation for frequency. mrcool.com...
  • Page 42 T1 and indoor unit coil temperature T2. Outdoor Fan Control: • The outdoor unit will be run at different fan speeds according to T4 and compressor running frequency. • For different outdoor units, the fan speeds are different. mrcool.com...

  • Page 43: Defrosting Mode

    • In condition 1~5 if any of the following heating, auto-drying, or fan-only mode on conditions are satisfied the defrost cycle ends the basis of T1, Ts, T4 and relative humidity. and the machine switches to normal heating mode. mrcool.com...

  • Page 44: Drying Mode

    • Timer on • The timer setting is available in this mode. • Timer off • Sleep mode • Follow me • Changes in: • Mode • Fan Speed • Setting temperature mrcool.com...

  • Page 45: Auto Restart Function

    Silence Press "Silence" on the remote control to enable the SILENCE function. While this function is active, the indoor unit will run at a faint breeze (1% fan speed), which reduces noise to the lowest possible level. mrcool.com...

  • Page 46: Maintenance

    Congesting the capillary tubing due to ice liquid detergent onto the indoor and outdoor build-up in the refrigerant circuit. units connections as if a leak if present bubbles • Corroding the refrigerant system. will form on the connection. Air Purging with Vacuum Pump: mrcool.com...
  • Page 47 7. Fully open the 2-way and 3-way valves and for an additional 20 minutes. tighten the cap of the 2-way and 3-way valves. • If the pressure does not achieve 15.5 Psi (-0.1 Mpa) after 50 minutes check for leaks. mrcool.com...

  • Page 48: Refrigerant Recharge

    11. Use a torque wrench to tighten the caps to a 6. Place the charging cylinder onto an electronic torque of 13.276 ft lb (18Nm). scale and record the starting weight. 12. Check for leaks. 7. Fully open the Handle Lo manifold valve (2- way and 3-way valves). mrcool.com...

  • Page 49: Re-Installation

    8. Use a torque wrench to tighten the caps to a then close it quickly. torque of 13.276 ft lb (18Nm). 4. Close the 2-way valve. 9. Check for leaks. 5. Operate the air conditioner in cooling mode. Cease operations when the gauge reaches 14.5 Psi (0.1 Mpa). mrcool.com...
  • Page 50 7. Fully open the 2-way and 3-way valves and for an additional 20 minutes. tighten the cap of the 2-way and 3-way valves. • If the pressure does not achieve 15.5 Psi (-0.1 Mpa) after 50 minutes check for leaks. mrcool.com...

  • Page 51: Outdoor Unit

    7. Mount the caps of the service port and the 4. Close the valve (Low side) on the charge set 2-way and 3-way valves. and turn off the vacuum pump. 8. Use a torque wrench to tighten the caps to a torque of 13.276 ft lb (18 Nm). mrcool.com...
  • Page 52 12. Check for leaks. Note: 1. Mechanical connectors used indoors shall comply with local regulations. 2. When mechanical connectors are reused indoors, sealing parts shall be renewed. When flared joints are reused indoors, the flare part shall be re-fabricated. mrcool.com...

  • Page 53: Safety Caution

    After maintenance is completed, insert the female end back into the port. Note: This picture is for reference only. Actual appearance may vary. mrcool.com...

  • Page 54: Troubleshooting

    Test the unit using the remote control. If the unit does undefined by the service manual. Ensure that this code is not respond to the remote, the indoor PCB requires not a temperature reading. replacement. If the unit responds, the display board requires replacement. mrcool.com...

  • Page 55: Error Display (Outdoor Unit With Auxiliary Board)

    EC 53 ODU Ambient Temperature Sensor (T4) Error TS05-ODU EC 54 Comp. Discharge Temperature Sensor (TP) Error TS05-ODU EC 50 Open or Short Circuit of Outdoor Unit Temperature Sensor (T3, T4, TP) TS05-ODU PC 0L Low Ambient Temperature Protection mrcool.com...

  • Page 56: Outdoor Unit Point Check Function

    Frequency limit caused by TP It means Bit1 Frequency limit caused by current frequency limit caused by T2, T3, and current Bit0 Frequency limit caused by voltage 0:off, 1:turbo, 2:high, 3:medium, 4:low, 5:breeze, 6:super breeze DC fan motor speed 7:other mrcool.com...
  • Page 57 "70". If the indoor unit is not connected, the digital display tube will show "--" Reason of stop Evaporator pipe temp. sensor T2B of 1# indoor unit S communication models display "--" Evaporator pipe temp. T2b of 2# indoor unit mrcool.com...
  • Page 58 Code of Outdoor Error Code of Indoor Unit Unit does not start Remote Control does not work Indoor display shows nothing No Cooling or Heating at all Less Cooling or Heating Unit Starts but Stops Shortly High noise High Vibration mrcool.com...
  • Page 59 Compressor Current Outdoor AC Voltage Indoor Capacity Test Reserve Outdoor Fan Speed EXV Opening Steps Indoor Fan Speed Indoor Humidity Adjusted Setting Temperature Reserve Reserve Reserve GA algorithm Frequency Approval From Manufacture □ Approved □ More Proof Needed □ Rejected mrcool.com...

  • Page 60: Information Inquiry & Setting

    Temperature can be memorized when the remote control is power on and TP Temperature power lost; and press "ON/OFF" for 2s to exit. When the remote control does not burn any parameters, the max. set temperature will not be memorized. (Set within 1 minute after power is on) mrcool.com...
  • Page 61 Indoor Target Frequency press the UP/DOWN key to select the cooling frequency threshold, press "OK" to confirm; and press "ON/OFF" for 2s to exit. (Range: 40, 41,... 83, 84,--, "--" cancels the settings) (set within 1 minute after power is on) mrcool.com...
  • Page 62 When the setting is successful, "CS" will be displayed; When the setting fails, "CF" will be displayed. Exit of Engineer Mode: 1. In engineer mode, press the key combination of "ON/OFF + Air Speed" for 2s. 2. The engineer mode will be exited if there are no valid key operations for continuous 60s. mrcool.com...
  • Page 63 ODU main control board DC bus high voltage protection PC 12 ODU main control board DC bus low voltage protection/341 MCE error PC 02 Compressor top (or IPM) temp. Protection PC 40 Communication error between outdoor main chip and compressor driven chip mrcool.com...
  • Page 64 Voltage freq. limited LC 03 Current freq. limited LC 06 IPM module temp. freq. limited LC 30 High pressure freq. limited LC 31 Low pressure freq. limited LH 07 Remote control frequency limitation in effect IDUs mode conflict (multi-zone) mrcool.com...

  • Page 65: Error Diagnosis Without Error Code

    Compressor short-cycles due to overload TS19-TS20 High suction pressure TS19-TS20 Low discharge pressure TS19-TS20 High suction pressure TS19-TS20 Low suction pressure TS19-TS20 Unit runs continuously but insufficient cooling TS19-TS20 Too cool TS19-TS20 Compressor is noisy TS19-TS20 Horizontal louver cannot revolve TS19-TS20 mrcool.com...
  • Page 66 Unit runs but shortly √ √ √ stops The unit startup and √ √ √ stops frequently Unit runs continuously but √ √ √ √ √ insufficient cooling/ heating Cool cannot change to heat Unit is noisy Test method/ remedy mrcool.com...
  • Page 67 Unit is on but the air is not cold/hot Unit runs but shortly stops The unit startup and √ stops frequently Unit runs continuously but √ √ √ insufficient cooling/ heating Cool cannot change to heat Unit is noisy √ √ Test method/ remedy mrcool.com...
  • Page 68 Condenser fan will not start Unit runs but √ √ √ √ √ √ shortly stops Compressor short-cycles √ √ √ due to overload High discharge √ √ √ √ √ √ pressure Low discharge √ √ pressure Test method/ remedy mrcool.com...
  • Page 69 √ √ √ √ √ √ √ √ √ √ √ insufficient cooling Too Cool X X X Compressor is X X X √ √ √ √ √ noisy Horizontal louver X X X cannot revolve Test method/ remedy mrcool.com...
  • Page 70 Air handler fan will √ √ √ √ not start Condenser fan will √ √ √ √ √ not start Unit runs but √ √ shortly stops Compressor short-cycles due to √ √ overload High discharge pressure Low discharge pressure Test method/ remedy mrcool.com...
  • Page 71 TROUBLESHOOTING 2. Field Electrical Circuit Maintenance Possible causes of trouble High suction pressure Low suction pressure Unit runs continuously but insufficient cooling Too cool √ √ Compressor is noisy Horizontal louver √ √ √ can not revolve Test method/ remedy mrcool.com...

  • Page 72: Quick Maintenance By Error Code

    √ √ √ √ Outdoor Fan Motor √ T3 Sensor √ T4 Sensor √ TP Sensor √ Reactor √ √ Compressor √ √ √ √ IPM Module Board √ High Pressure Protector √ Low Pressure Protector √ Additional Refrigerant mrcool.com...
  • Page 73 √ √ √ √ Outdoor PCB √ Outdoor Fan Motor T3 Sensor TP Sensor Pressure Sensor √ Reactor √ Compressor √ IPM Module Board High Pressure Valve Assembly √ High Pressure Protector √ Low Pressure Protector √ Additional Refrigerant mrcool.com...

  • Page 74: Troubleshooting By Error Code

    EEPROM: A read-only memory whose contents can be erased and reprogrammed using a puled voltage. The location of the EEPROM chip on the indoor PCB is shown in the following image: Note: These pictures are for reference, actual appearance may vary. mrcool.com...
  • Page 75 EEPROM: A read-only memory whose contents can be erased and reprogrammed using a puled voltage. The location of the EEPROM chip on the outdoor PCB is shown in the following image: Note: This picture is for reference only, actual appearance may vary. mrcool.com...
  • Page 76 TROUBLESHOOTING TS02-S-INV: IDU & ODU 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: mrcool.com...
  • Page 77 Use a multimeter to test the resistance of the reactor which does not connect with the capacitor. • The normal value should be around zero ohms. Otherwise the reactor has a malfunction. Note: The pictures and the values are for reference only, actual condition and specific values may vary. mrcool.com...
  • Page 78 Recommended parts to prepare: • Connection wires • Indoor main PCB Troubleshooting and repair: Note: Zero crossing detection error is only valid for the unit with AC fan motor, for other models, this error is invalid. mrcool.com...
  • Page 79 Description: When the indoor fan speed keeps too low or too high for a period of time the LED displays the failure code and the AC turns off. Recommended parts to prepare: • Connection wires • Fan assembly • Fan motor • Indoor main PCB Troubleshooting and repair: mrcool.com...
  • Page 80 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 has problems and will need to be replaced. mrcool.com...
  • Page 81 Description: When the outdoor fan speed keeps too low or too high for a certain time, the LED displays the failure code and the system turns off. Recommended parts to prepare: • Connection wires • Fan assembly • Fan motor • Outdoor main PCB Troubleshooting and repair: mrcool.com...
  • Page 82 If the value of the voltage is not in the range showing in below table the PCB has a problem and needs to be replaced. Color Signal Voltage Vs/Vm 192V~380V Black White 13.5-16.5V Yellow 0~6.5V Blue 13.5-16.5V mrcool.com...
  • Page 83 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: • Connection wires • Sensors • Indoor main PCB Troubleshooting and repair: Note: The picture and the value are for reference only, actual appearance and values may vary. mrcool.com...
  • Page 84 • Outdoor main PCB Troubleshooting and repair: Note: For certain models the outdoor unit will use a combination sensor, T3, T4 and TP are the same sensor. This picture and value are for reference only, actual appearance and value may vary. mrcool.com...
  • Page 85 Description: Judging the abnormality of the refrigeration system according to the number of compressor as well as the changes in the operating parameters caused by excessive exhaust temperature. Recommended parts to prepare: • Indoor PCB • Additional refrigerant Troubleshooting and repair: mrcool.com...
  • Page 86 TROUBLESHOOTING TS07: Indoor PCB/Display board communication error diagnosis and solution Description: Indoor PCB does not receive feedback from the display board. Recommended parts to prepare: • Communication wire • Indoor PCB • Display board Troubleshooting and repair: mrcool.com...
  • Page 87 TS08-S: Current overload protection diagnosis and solution Description: An abnormal current rise is detected by checking the specified current detection circuit. Recommended parts to prepare: • Connection wires • Reactor • Outdoor fan • Outdoor PCB Troubleshooting and repair: mrcool.com...
  • Page 88 Description: The indoor unit receives a fault signal for 10s or the indoor unit does not receive feedback from the refrigerant sensor for 150s. Recommended parts to prepare: • Connection wires • Sensors • Indoor main PCB Troubleshooting and repair: mrcool.com...
  • Page 89 APP, and so on to eliminate the alarm) and any other non- refrigerant leakage fault the indoor unit will only display ECC1 and the buzzer will not make a sound. Recommended parts to prepare: • Additional refrigerant Troubleshooting and repair: mrcool.com...
  • Page 90 Description: When the voltage signal the IPM sends to the compressor drive chip is abnormal the LED displays a fault code and the system turns off. Recommended parts to prepare: • Connection wires • IPM module board • Outdoor fan assembly • Compressor • Outdoor PCB Troubleshooting and repair: mrcool.com...
  • Page 91 TS10-S: ODU 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 • PCM • Reactor Troubleshooting and repair: mrcool.com...
  • Page 92 Description: If the temperature of the IPM module is higher than a certain value the LED displays a fault code. Recommended parts to prepare: • Connection wires • Outdoor PCB • IPM module board • High pressure protector • System blockages Troubleshooting and repair: mrcool.com...
  • Page 93 Description: An abnormal inverter compressor drive is detected by a special detection circuit including communication signal detection, voltage detection, compressor rotation speed signal detection, etc. Recommended parts to prepare: • Connection wires • Outdoor PCB • IPM module board • Outdoor fan assembly • Compressor Troubleshooting and repair: mrcool.com...
  • Page 94 638 PSI.(4.4MPa)). Or the outdoor pressure switch cut off the system due to low pressure (if the pressure is lower than 18.85 PSI.(0.13MPa) the LED will display a fault code. Recommended parts to prepare: • Connection wires • Outdoor PCB • Refrigerant • Pressure switch • Outdoor fan Troubleshooting and repair: mrcool.com...
  • Page 95 TROUBLESHOOTING TS26-INV Cont. mrcool.com...
  • Page 96 When the compressor is on and the outdoor ambient temperature (T4) is lower than -40°F (-40°C) for 10s the system will stop and display the fault code. When the outdoor ambient temperature (T4) is no lower than -25.6°F (-32°C) for 10s, the unit will exit protection. mrcool.com...
  • Page 97 It will start again only when the outdoor pipe temperature sensor is less than 125.6°F(52°C). Recommended parts to prepare: • Connection wires • Outdoor main PCB • Condenser temperature sensor • Refrigerant • Outdoor fan Troubleshooting and repair: mrcool.com...
  • Page 98 • PFC module Troubleshooting and repair: First test the resistance between every two ports of U,V,W of the IPM and P,N. If any result in reading 0 or close to 0 the IPM is defective, otherwise please follow the procedure below: mrcool.com...
  • Page 99 TS31: Communication error between the outdoor main chip and the compressor drive chip diagnosis and solution Description: The main PCB cannot detect the IPM board. Recommended parts to prepare: • Connection wires • Outdoor main PCB • IPM board • Electric control box Troubleshooting and repair: mrcool.com...
  • Page 100 • Additional refrigerant Troubleshooting and repair: Note: For certain models the outdoor unit will use a combination sensor, T3, T4 and TP are the same sensor. This picture and value are for reference only, actual appearance and value may vary. mrcool.com...
  • Page 101 Description: When the three-phase sampling current of the DC motor is abnormal (especially when the current of one or more phases is always small and almost 0) the LED display will show a fault code. Recommended parts to prepare: • Connection wires • Outdoor main PCB • Fan motor Troubleshooting and repair: mrcool.com...
  • Page 102 Description: When the three-phase sampling current of the DC motor is abnormal (especially when the current of one or more phases is always small and almost 0) the LED display will show a fault code. Recommended parts to prepare: • Connection wires • Outdoor main PCB • Compressor Troubleshooting and repair: mrcool.com...

  • Page 103: Check Procedures

    1. Disconnect the temperature sensor from the PCB. 2. Measure the resistance value of the sensor using a multi-meter. 3. Check corresponding temperature sensor resistance value table. Note: The picture and the value are for reference only, actual condition and specific values may vary. mrcool.com...
  • Page 104 1.99Ω 1.57Ω 2.13Ω Blue-Black Red-Black KTN150D30UFZA Resistance Value KSK103D32UEZ31 KTN150D30SFZA Blue-Red 4.06Ω 1.02Ω Blue-Black Red-Black Resistance Value KSM135D23UFZ KTN110D42UFZ KSN140D21UFZ KTM140D78UFZ3 Blue-Red 1.72Ω 1.82Ω 1.28Ω 1.5Ω Blue-Black Red-Black KTF235D22UMT Resistance Value ATF235D22TMT KTM240D46UKT2 KTF250D22UMT Blue-Red 0.75Ω 1.04Ω Blue-Black Red-Black mrcool.com...
  • Page 105 Resistance Value KTM240D63SKT2 KTM240D57UMT DTN210D32UFZ KSN140D33UFZB3 Blue-Red Blue-Black 1.19Ω 0.62Ω 1.7Ω 1.68Ω Red-Black Resistance Value KTM110D79UFZA3 GSD098XKUF7JV6B Blue-Red Blue-Black 1.88Ω 2.83Ω Red-Black Note: The picture and the value are for reference only, actual condition and specific values may vary. mrcool.com...

  • Page 106: Ipm Continuity Check

    ∞ ∞ (Several MΩ) (Several MΩ) Or test the conductivity of IPM with diode mode: Needle-type Tester Needle-Type Tester Normal Value Normal Value Black Black Open-Circuit 0.3-0.5V Needle-type Tester Needle-Type Tester Normal Value Normal Value Black Black 0.3-0.5V Open-Circuit mrcool.com...
  • Page 107 1. Power on and 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 range the PCB has problems and needs to be replaced. mrcool.com...
  • Page 108 TROUBLESHOOTING 2. Turn the power off and use a digital tester to measure the resistance. The value should be 1.8~2.5 K±5%Ω. mrcool.com...
  • Page 109 1. Disconnect the connector from the outdoor PCB. 2. Measure the resistance value of each winding using a multi-meter. 3. Check the resistance value of each winding in the following table. Color of Lead Winding Normal Value Red-Blue Red-Yellow About 50Ω Brown-Orange Brown-White mrcool.com...

  • Page 110: Temperature Sensor Resistance Table

    5.488 1.762 21.26 5.32 1.171 115.2 20.46 5.157 1.674 109.8 19.69 1.632 104.6 18.96 4.849 99.69 18.26 4.703 95.05 17.58 4.562 90.66 16.94 4.426 86.49 16.32 4.294 82.54 15.73 4.167 78.79 15.16 4.045 75.24 14.62 3.927 71.86 14.09 3.812 mrcool.com...
  • Page 111 3.45097 0.8795 0.2777 19.6891 3.31847 0.85248 0.27078 18.7177 3.19183 0.82643 0.26408 17.8005 3.07075 0.80132 0.25757 16.9341 2.95896 0.77709 0.25125 16.1156 2.84421 0.7537 0.24512 15.3418 2.73823 0.73119 0.23916 14.6181 2.63682 0.68844 0.23338 13.918 2.53973 0.66818 0.22776 13.2631 2.4467 0.64862 0.22231 mrcool.com...

  • Page 112: System Pressure Table

    372.84 114.8 350.54 3.51 50.84 -5.8 2632.1 26.32 381.74 116.6 364.08 3.64 52.80 2694.7 26.95 390.82 118.4 378.02 3.78 54.83 -2.2 2758.33 27.58 400.04 120.2 392.37 3.92 56.91 -0.4 2823.2 28.23 409.46 407.13 4.07 59.05 2889.3 28.89 419.04 123.8 mrcool.com...
  • Page 113 638.56 802.08 8.02 116.33 37.4 4498.7 44.99 652.46 159.8 827.47 8.27 120.01 39.2 4596.5 45.97 666.64 161.6 853.49 8.53 123.78 4696.5 46.97 681.15 163.4 880.11 8.80 127.64 42.8 4798.9 47.99 696.00 165.5 907.35 9.07 131.60 44.6 4904.1 49.04 711.25 mrcool.com...
  • Page 114 Advantage Series The design and specifications of this product and/or manual are subject to change without prior notice. Consult with the sales agency or manufacturer for details.

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