Malfunction Display: E4 Compressor Exhaust High Temperature Protection; Malfunction Display: E5 Compressor Overheat - York DHM42CMB21S Service Manual

Malfunction Display: E4 Compressor Exhaust High Temperature Protection

Discharge temperature protection
Measure if compressor's discharge
temperature has reached 115℃
System pipeline leaks. Please add refrigerant
according to the amount specified in the nameplate

Malfunction Display: E5 Compressor Overheat

Check if compressor's connection line is
properly connected
Check if current value is higher than the protector's setting
42
Y
N
Y
Abnormal overcurrent
Y
Y
Y
If unit's high pressure is normaR l e
Y
If voltage is normal
Y
Replace mainboard
Measure if temperature sensor's
resistance value is correct
Y
Replace the outdoor
unit mainboard
N
Adjust compressor's connection line
N
Replace overcurrent protector
N
high pressure protection
N
Contact the power supply
company
N
Replace relevant discharge
temperature sensor