20 Nov 70

Symptom: DXF-19, DXH-19, MGC-19 – ERROR CODE EC

Solution: MULTIPLE SOLUTIONS

Cause: REFRIGERANT LEAKAGE DETECTION

Remarks:

DESCRIPTION:

DEFINE THE EVAPORATOR COIL TEMPERATURE. T2 OF THE COMPRESSOR JUST STARTS RUNNING AS TCOOL.

IN THE FIRST 8 MINUTES AFTER THE COMPRESSOR STARTS UP, IF ‘T2 < TCOOL-2 DEGREES CELCIUS' DOES NOT CONTINUE FOR 4 SECONDS AND THE COMPRESSOR RUNNING FREQUENCY IS HIGHER THAN 50HZ AND DOES NOT CONTINUE FOR 3 MINUTES, AND THIS SITUATION HAPPENS 3 TIMES, THE DISPLAY AREA WILL SHOW "EC" AND THE AC UNIT WILL TURN OFF.
REPAIR:

1) TURN POWER OFF, THEN RESTART THE UNIT 2 MINUTES LATER:

DOES A PROBLEM REMAIN?

NO = THE UNIT IS OPERATING NORMALLY
YES = CHECK 2)

2) PUT YOUR HANDS IN FRONT OF THE INDOOR AIR OUTLET:

IS THERE COOL AIR BLOWING OUT FROM THE INDOOR AIR OUTLET?

YES = CHECK THE T2 SENSOR –> IS IT SECURELY ATTACHED? YES = REPLACE THE INDOOR PCB (NO = ATTACH SECURELY)
NO = CHECK 3)

3) CHECK THE SYSTEM FOR LEAKAGES:

ARE ANY LEAKAGES PRESENT?

NO = CHECK THE SYSTEM FOR BLOCKAGES AND CLEAR BLOCKAGES IF PRESENT
YES = REPAIR THE LEAKAGE AND RECHARGE THE REFRIGERANT