42

Symptom: DXG-18, DXH-18, MGC-18 – ERROR CODE H4

Solution: MULTIPLE SOLUTIONS

Cause: SYSTEM IS ABNORMAL

Remarks:

DESCRIPTION:

*AC UNIT IN COOLING/DRY MODE: ALL LOADS WILL STOP, EXCEPT THE INDOOR FAN THAT WILL CONTINUE TO OPERATE.

*AC UNIT IN HEATING MODE: THE COMPLETE UNIT STOPS OPERATION.

REPAIR:

1) IMPROPER INPUT VOLTAGE:

SOLUTION 1) CHECK IF THE VOLTAGE IS TOO LOW. IF YES, PLEASE ADJUST IT

2) EVAPORATOR OR CONDENSER IS DIRTY:

SOLUTION 2) CHECK IF THE EVAPORATOR AND CONDENSER ARE DIRTY. IF YES, PLEASE CLEAN IT

3) REFRIGERANT IS EXCESSIVE:

SOLUTION 3) CHECK IF THE REFRIGERANT IS EXCESSIVE OR NOT

4) OUTDOOR OR INDOOR TEMPERATURE SENSOR IS NOT OK:

SOLUTION 4) CHECK IF BOTH TEMPERATURE SENSORS ARE OK OR NOT

5) DEFECT OF OUTDOOR UNIT CONTROLLER:

SOLUTION 5) REPLACE WITH A NEW CORRESPONDING PCB OF OUTDOOR UNIT

6) DEFECT OF THE COMPRESSOR:

SOLUTION 6) REPLACE WITH A NEW CORRESPONDING COMPRESSOR