What E422 means
The electronic expansion valve controls the refrigerant flow into the evaporator. During self-diagnosis, the outdoor unit checks if the EEV can fully close. If it cannot (stuck open or not responding), E422 appears.
Samsung AC E422 Error — EEV Close Self-Diagnosis Fault & Fix
E422
Quick answer
E422 means the electronic expansion valve (EEV) close self-diagnosis has failed on the outdoor unit.
What does the E422 code mean?
E422 is an EEV (electronic expansion valve) close self-diagnosis error. The valve did not respond correctly during the outdoor unit's self-test.
Common causes
- EEV coil failure (stuck open)
- Loose EEV connector on the outdoor PCB
- Debris in the valve blocking full closure
- Outdoor PCB EEV driver circuit failure
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How to fix the E422 error
Power cycle
Switch off for 10 minutes, then restart. The self-diagnosis will re-run.
Check the EEV connector
On the outdoor PCB, locate the EEV harness and reseat it.
Listen for the valve
During startup you should hear a faint clicking/stepping sound from the EEV. Silence suggests a dead coil.
Call a technician
EEV replacement involves the sealed refrigerant circuit.
Safety first: The EEV is part of the refrigerant system. Only qualified technicians should replace it.
Part you may need: Electronic expansion valve (EEV)
EEV failures are more common in systems over 5 years old or in areas with dirty power (voltage fluctuations).
Frequently asked questions
Can I clean the EEV?
Not easily — it is a precision valve inside the refrigerant circuit. Replacement is the standard fix.
Does E422 mean no cooling?
Yes — if the EEV cannot close properly during self-test, the unit will not start.
