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MRCOOL DIY Ductless Mini Split Error Codes:
What Are Error Codes?
Troubleshooting A P1 or P4 Error Code:
A P1 or P4 error code might mean an abnormal rise or drop in the voltage of your MRCOOL system. Or, it can mean you need to release the refrigerant in your MRCOOL unit.
When you see a P1 or P4 error code on your MRCOOL mini split, first turn the unit off. Then turn it back on after waiting two minutes. If the problem persists, go to the outdoor unit. Remove the side wiring cover with a screwdriver. Then, using a multi-meter, test the voltage. For a unit running off of 120 volts, place the ends on L1 and ground. For a unit running off of 240 volts, touch the ends to L1 and L2.
Also, you should check to make sure the refrigerant valves are open all the way. You can achieve this with the right size allen wrench. It is important you don't force it. Just make sure the valves are open.
If these steps don't correct the P1 or P4 error code, it's important that you call the MRCOOL Warranty department at (270) 366-0457 so they can help you figure out what may be causing the P1 or P4 error code.
List of MRCOOL Error Codes and their meaning:
E0 - Indoor unit EEPROM parameter error
E1 - Indoor / outdoor units communication error
E2 - Zero-crossing signal detection error
E3 - Indoor fan speed has been out of control
E4 - Indoor room temperature sensor T1 open circuit or short circuit
E5 - Evaporator coiltemperature sensor T2 open circuit or short circuit EC - Refrigerant leakage detection
F0 - Overload current protection
F1 - Outdoor ambient temperature sensor T4 open circuit or short circuit
F2 - Condenser coiltemperature sensor T3 open circuit or short circuit
F3 - Compressordischarge temperature sensor TP open circuit or short circuit
F4 - Outdoor unit EEPROM parameter error
F5 - Outdoor fan speed has been out of control
P0 - IPM malfunction or IGBT over-strong current protection
P1 - Over voltage or over low voltage protection
P2 - High temperature protection of IPM module or compressor top
P3 - Outdoor ambient temperature too low
P4 - Inverter compressor drive error
P5 - Indoor units mode conflict (multi-zone ONLY)
P6 - Low pressure protection(Only for 36K)
**If you need further assistance in troubleshooting your MRCOOL error code, it's important that you call the MRCOOL Warranty department at (270) 366-0457 so they can help you figure out how to resolve your error code issue**