P29 Electronic expansion valve check


Content Alarm code Conclusion Possible cause Check method
Electronic
expansion valve
check		 J291 Pump down time
is too long.		 Electronic expansion valve
wiring malfunction		 Check knocking sound of the coil
Disconnect and connect the coil
connector.



Electronic expansion valve coil
failure.		 Check knocking sound
of coil.



Hot gas by-pass solenoid valve Touch the outlet line of
solenoid valve.



Leakage of discharge gas bypass
solenoid valve leaking		 Touch the outlet line of
the solenoid valve.
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