MRCOOL AC Error Codes

MRCOOL AC Error Codes

Error code meaning

E1 activation of high pressure switch

Stirring of E3 low pressure switch

Discharge of high temperature protection of E4 air compressor

F2 malfunction of condenser temperature thermistor

F3 malfunction of outdoor ambient temperature thermistor

F4 Exhaust Exit Temporary Malfunction. The sensor

On normal operation

H1 defrost operation

How to fix

Error Code: E1
Case of trouble: activation of high pressure switch
Origin of trouble signal: high pressure switch
Remedy: The abnormality is detected when the high pressure switch is exposed for 3 seconds. The system will shut down. The unit will report the fault. For the first two faults within 30 minutes, the unit can be recovered automatically. If more than three times, the unit cannot be recovered automatically.

Error Code: E3
Case of trouble: activation of low pressure switch
Origin of Trouble Signal: Low Pressure Switch
Remedy: When the unit runs or does not run for more than 4 minutes, the low pressure switch opens for more than 3sec and the system will shut down. The unit will report the fault. For the first two faults within 30 minutes, the unit can be recovered automatically. If more than three times, the unit cannot be recovered automatically.

Error Code: E4
Case of trouble: high temperature protection of air compressor
Origin of Trouble Signal: Exhaust on Temperature Protection
Remedy: If the exhaust temperature exceeds 125 ° C for more than 5sec, the system will shut down. After stopping the compressor for 3 minutes, if the exhaust temperature is below 90 ° C for more than 5 seconds, the compressor will start again. For the first two faults within 30 minutes, the unit can be recovered automatically. If more than three times, the unit cannot be recovered automatically.

Error Code: F2
Case of trouble: Condenser temperature thermistor malfunction
Origin of Trouble Signal: Condenser Temperature Thermistor
Remedy: Condenser temperature thermistor malfunction is detected when there is a short circuit or open circuit in the condenser temperature thermistor for more than 5 seconds. The system will shut down. Reset is automatic for condenser temperature thermistor malfunction.

Error Code: F3
Case of trouble: outdoor ambient temperature thermistor malfunction
Origin of Trouble Signal: Outdoor Ambient Temperature Thermistor
Remedy: Short-circuit or open-circuit malfunctions are detected in outdoor ambient temperature thermistors for more than 5 seconds. The system will shut down. Reset is automatic for condenser temperature thermistor malfunction.

Error Code: F4
Trouble Case: Exhaust Temporary Malfunction. The sensor
Origin of trouble signal: exhaust temperature sensor
Remedy: If the exhaust temperature sensor detects 5 seconds after the open circuit, after being sequentially turned on at any time for 2 minutes or a short circuit for 5 seconds. The system will shut down. After the fault is terminated, the system can automatically resume operations.

Error Code: ON
Case of trouble: Normal operation
Origin of Trouble Signal: A unit operating normally or in standby mode.

Error Code: H1
Trouble Case: Defrost Operation
Origin of Trouble Signal: unit working in defrost
error analysis
Case of trouble: electrical problem
Solution:
1. Check the control transformer power (24V).
2. If power is available to demand the control board and do not light the LED (LED), replace the control board.

Case of trouble: activation of high pressure switch
Remedy: The abnormality is detected when the high pressure switch is exposed for 3 seconds. The system will shut down. The unit will report the fault. For the first two faults within 30 minutes, the unit can be recovered automatically. If more than three times, the unit cannot be recovered automatically.
Case of trouble: activation of low pressure switch
Remedy: When the unit runs or does not run for more than 4 minutes, the low pressure switch opens for at most 3 seconds and the system will shut down .. The unit will report this fault. For the first two faults within 30 minutes, the unit can be recovered automatically. If more than three times, the unit cannot be recovered automatically.
Case of trouble: high temperature protection of air discharge compressor
Remedy: If the exhaust temperature exceeds 125 ° C for more than 5 degrees, the system will shut down. After stopping the compressor for 3 minutes, if the exhaust temperature is less than 90 ° C for more than 5 degrees, the compressor will start again. For the first two faults within 30 minutes, the unit can be recovered automatically. If more than three times, the unit cannot be recovered automatically.
Trouble Case: Exhaust Temporary Malfunction. The sensor
Remedy: If the exhaust temperature sensor is detected open circuit after the compressor is progressively turned on at any time after 3 minutes or 5 seconds after a short circuit, the system will shut down. After the fault is terminated, the system can automatically resume operations.
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Fault code resolution

E0 Indoor EEPROM Error

E1 communication malfunction between indoor and outdoor units

E3 indoor fan speed fault

E4 indoor room temperature sensor open circuit or short circuit

E5 Evaporator Coil Temperature Sensor Open Circuit or Short Circuit

EC refrigerant leak leakage malfunction

EE water level alarm malfunction

E8 communication malfunction between two indoor units (for twin models)

Other malfunction of E9 twins model

F0 current overload protection

F1 outdoor room temperature sensor open circuit or short circuit

F2 outdoor condenser pipe temperature sensor error

F3 discharging air temperature sensor error

F4 outdoor EEPROM error

F5 Outdoor fan speed malfunction (only for DC fan motor)

F6 T2b sensor error

P0 Inverter Module IPM Protection

P1 High / Low Voltage Protection

P2 high temperature protection of the top of the compressor

P3 Outdoor Low Temp. Security

P4 compressor drive error

P5 Mode Conflict

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