16 May 72
Symptom: MGC-19,DXH-19, DXF-19 P0
Solution: MULTIPLE SOLUTIONS
Cause: IPM MALFUNCTION OR IGBT OVER-STRONG CURRENT PROTECTION
Remarks:
DESCRIPTION:
WHEN THE VOLTAGE SIGNAL THAT THE IPM SENDS TO THE COMPRESSOR DRIVE CHIP IS ABNORMAL, THE DISPLAY LED SHOWS “P0” AND THE AC TURNS OFF.
***REPAIR OPTION 1 (FOR 9K – 24K):***
1) CHECK THE WIRING BETWEEN PCB AND COMPRESSOR:
DOES AN ERROR EXIST?
YES = ENSURE PROPER CONNECTIONS OR REPLACE THE WIRES AND CONNECTORS
NO = CHECK 2)
2) CHECK THE IPM:
IS IT FUNCTIONING PROPERLY?
NO = REPLACE THE IPM BOARD OR REPLACE THE OUTDOOR PCB
YES = CHECK 3)
3) CHECK THE OUTDOOR FAN AND THE OUTDOOR UNIT VENTILATION:
IS IT FUNCTIONING PROPERLY?
NO = CHECK THE SOLUTION FOR THE FAN SPEED MALFUNCTION (ERROR CODE E3)
YES = CHECK 4)
4) CHECK THE COMPRESSOR RESISTANCE VALUES:
ARE THEY WITHIN ACCEPTABLE PARAMETERS?
NO = REPLACE THE COMPRESSOR
YES = REPLACE THE OUTDOOR PCB
***REPAIR OPTION 2 (FOR 30K – 36K):***
PLEASE CHECK PAGE 106 OF ATTACHMENT FOR DETAILED SERVICE DIAGRAM.
NO = CHECK 2)
YES = CHECK 3)
YES = CHECK 4)
YES = REPLACE THE OUTDOOR PCB