20 Nov 85

Symptom: MGTC-20, DXTC-20, DXTH-20 – ERROR CODE P7

Solution: MULTIPLE SOLUTIONS

Cause: OVERHEATING PROTECTION ON HEATING MODE

Remarks:

DESCRIPTION:

ON HEATING MODE, WHEN THE INDOOR UNIT EVAPORATOR COIL TEMPERATURE IS IPTò62?, THE OUTDOOR UNIT PCB WILL SWITCH OFF THE OUTDOOR UNIT AND THE P7 ERROR CODE WILL BE DISPLAYED.

REPAIR:

1) IT IS A NORMAL PROTECTION WHEN THE HEATING MODE IN HIGH ENVIRONMENT TEMPERATURES IS ACTIVATED

2) CHECK IF THE FAN MOTOR WORKS NORMALLY

3) CHECK IF THE INDOOR UNIT COIL TEMPERATURE SENSOR IS NORMAL

4) CHECK IF THE INDOOR UNIT PCB IS OK OR NOT