12
3.Evaporator air return grille blocked or
evaporator fin dirty (frost on the
evaporator)
Clean grille or evaporator
fin
HP lower
LP too high
Compressor interior valve damaged
Check and replace compressor
HP higher
LP too high
1. Extension valve temperature sensor
packing failure
Put the temperature sensor on
The pipe, and pack the sensor
with isolation
2. Temperature sensor leakage
Replace the extension valve