Samsung Electronics 4-9
Indoor unit display
(Operation) X (Defrost)
X (Timer)
(Fan)
(Filter)
Wire remote controller display
E422
Symptom
Clogging of outdoor's service valve
Failure
Valve clog
4-2-5 Outdoor's service valve(Clog)
No
Yes
Is the outdoor service valve clogging?
Open the outdoor's service valve
Replace the PCB and restart the unit
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