Troubleshooting
4-2-5 Outdoor's service valve(Clog)
Indoor unit display
Wire remote controller display
Symptom
Failure
4-8
(Operation)
X (Defrost)
E422
Clogging of outdoor's service valve
Valve clog
Is the outdoor service valve clogging?
No
Replace the PCB and restart the unit.
X (Timer)
(Fan)
(Filter)
Yes
Open the outdoor's service valve.
Samsung Electronics