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Symptom: DXG-18, DXH-18, MGC-18 – ERROR CODE F4

Solution: MULTIPLE SOLUTIONS

Cause: OUTDOOR CONDENSER TEMPERATURE SENSOR IS OPEN/SHORT CIRCUITED

Remarks:

DESCRIPTION:

*AC UNIT IN COOLING/DRY MODE: THE COMPRESSOR AND OUTDOOR FAN STOP OPERATING WHILE THE INDOOR FAN WILL CONTINUE TO OPERATE.

*AC UNIT IN HEATING MODE: AFTER OPERATING FOR 3 MINUTES, THE COMPLETE UNIT STOPS OPERATION.

REPAIR:

1) POOR CONTACT/CONNECTION OF INDOOR TEMPERATURE SENSOR (LOOSE):

SOLUTION 1) CHECK IF THE SENSOR WIRE PLUG IS LOOSE FROM THE PCB OR NOT. IF YES, INSERT THE TEMPERATURE SENSOR WELL

2) DEFECT OF TEMPERATURE SENSOR PART(S):

SOLUTION 2) REPLACE PART(S) OF TEMPERATURE SENSOR CIRCUIT

3) THE RESISTANCE OF TEMPERATURE SENSOR DEVIATES/DAMAGED:

SOLUTION 3) CHECK IF THE RESISTANCE OF TEMPERATURE SENSOR DEVIATES

4) USE OF WRONG TEMPERATURE SENSOR:

SOLUTION 4) CHECK IF A WRONG TEMPERATURE SENSOR HAS BEEN USED. IF YES, USE THE CORRECT SENSOR

5) SHORT CIRCUIT BETWEEN TEMPERATURE SENSOR AND SHELL OR COPPER TUBE:

SOLUTION 5) CHECK IF THERE IS A SHORT CIRCUIT BETWEEN TEMPERATURE SENSOR AND SHELL OR COPPER TUBE

6) THE RESISTANCE OF TEMPERATURE SENSOR CIRCUIT DEVIATES OR CREEPAGE OF CAPACITANCE:

SOLUTION 6) REPLACE RESISTANCE OF TEMPERATURE SENSOR CIRCUIT OR CAPACITANCE

7) THE CONTROLLER CHIP IS ABNORMAL:

SOLUTION 7) REPLACE THE CONTROLLER

8) MAIN BOARD OF INDOOR UNIT IS DAMAGED:

SOLUTION 8) REPLACE MAIN BOARD OF INDOOR UNIT