Outdoor's Service Valve(Clog) - Samsung AHU Series Service Manual

Troubleshooting

4-2-5 Outdoor's service valve(Clog)

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