20 Nov 83

Symptom: MGTC-20, DXTC-20, DXTH-20 – ERROR CODE P5

Solution: MULTIPLE SOLUTIONS

Cause: SUBCOOLING PROTECTION ON COOLING MODE

Remarks:

DESCRIPTION:

ON COOLING OR DRY MODE, WHEN THE INDOOR UNIT EVAPORATOR COIL TEMPERATURE IS IPT<1? CONTINUOUSLY FOR 3 MINUTES AFTER THE COMPRESSOR STARTED UP FOR 6 MINUTES, THE CPU WILL SWITCH OFF THE OUTDOOR UNIT AND THE P5 ERROR CODE WILL BE DISPLAYED.
REPAIR:

1) IT IS A NORMAL PROTECTION WHEN THE UNIT IS IN COOLING MODE IN LOW ENVIRONMENT TEMPERATURES

2) WHEN THE INDOOR UNIT FAN MOTOR IS IN LOW SPEED OR IT DOES NOT OPERATE AT ALL, CHECK IF THE FAN MOTOR HAS ANY PROBLEMS. ALSO CHECK IF THE FAN MOTOR CAPACITOR IS BROKEN OR IF THE FAN BLADE IS BLOCKED? ALSO, IT COULD BE POSSIBLE THAT THE AIR INLET AND/OR AIR OUTLET OF THE INDOOR UNIT IS NOT FREE.

3) CHECK THE RESISTANCE OF INDOOR UNIT COIL TEMPERATURE DRIFT

4) IF THE INSPECTIONS/REPAIRS DESCRIBED ABOVE ARE ALL OK, PLEASE REPLACE THE INDOOR UNIT PCB