Compressor Overload, Diacharge Protection Malfunction - York DHM42CMB21S Service Manual

(8) Compressor overload, diacharge protection malfunction

Main checking points:
If the eletric expansion valve is connected well or it is broken
I f there is refrigerant leakage
I f the overload protector is broken
Flow chart:
no
Replace the
overload
protector
Note: The detection method of the coil of the eletric expansion valve: there are five pieces of the coil of the eletric expansion
valve, the resistance of one of them (the leftmost or the rightmost one) is almost the same as the resistance of other terminal
). Judge the condition of the electronic expansion valve through detecting the resistance.
(within
100
Start
If the overload protector is connected well?
yes
Check the resistance between the two
ends of the overload protector in ambient temperature,
if the resistance is below 1k
yes
If the wiring of the eletric expansion valve
is coonected well?
Check the coil of the eletric
expansion valve, replace
it if it is broken
Eliminate the malfunction
no
Check the refrigerant status, if there is
refrigerant leakage, recharge it according
to the service manual
Eliminate the malfunction
no
Replace outdoor
mainboard
End
no
no
yes
yes
Reconnect according
to the wiring diagram
31