MRCOOL Split AC Error Codes



E1:Actuation of high pressure switch*High pressure switch*Abnormality is detected when the contact of the high pressure switch opens for 3 sec. The system will be shut down. The unit will report this fault. For the first two faults within 30 minutes, the unit can be recovered automatically. If over three times, the unit cannot be recovered automatically.

E3:Actuation of low pressure switch*Low pressure switch*When the unit runs more than 4 minutes or does not run, the low pressure switch opens for more than3sec and the system will be shut down. The unit will report this fault. For the first two faults within 30 minutes, the unit can be recovered automatically. If over three times, the unit cannot be recovered automatically.

E4:Air discharge hightemperature protection of compressor*Exhaust overtemperature protection*The exhaust temperature is higher than 125°C for more than 5sec, the system will be shut down. After stopping the compressor for 3 mins, if the exhaust temperature is lower than 90°C for more than 5 sec, the compressor will re-start. For the first two faults within 30 minutes, the unit can be recovered automatically. If over three times, the unit cannot be recovered automatically.





F2:Malfunction of condenser temperature thermistor*Condenser temperature thermistor*Malfunction of condenser temperature thermistor is detected when there is a short circuit or an open circuit in the condenser temperature thermistor for more than 5 sec. The system will be shut down. The reset for the malfunction of condenser temperature thermistor is automatic.

F3:Malfunction of outdoor ambient temperature thermistor*Outdoor ambient temperature thermistor*Malfunction outdoor ambient temperature thermistor is detected when there is a short circuit or an open circuit in the outdoor ambient temperature thermistor for more than 5 sec. The system will be shut down. The reset for the malfunction of condenser temperature thermistor is automatic.

F4:Malfunction of Exhaust Temp. Sensor*Exhaust temperature sensor*If the exhaust temperature sensor is detected of open circuit 5 seconds successively after the compressor is started for 2 minutes or short circuit 5 seconds successively at any time .The system will be shut down. After the fault is eliminated, the system can automatically resume to operation.

oN:Normal operation*Unit operating normally or in standby mode.*None required.

H1:Defrost operation*Unit operating in defrost*None required.

For 13 SEER R410A Unitary Ducted Split AC & Heat Pump

MRCOOL Split AC Manual PDF




One Response to MRCOOL Split AC Error Codes

  1. Mike says:

    This is nice I see no information on the error codes anywhere in the documentation that came with my unit nor on their website.

    However, I am getting a P4 code. Any idea what this is for?

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