Samsung AC018KN4DCH Service Manual page 94

Troubleshooting
4-4-20. Pipe blockage error(Error Code : E422)
1. Test items
1) Check the open state of the outdoor unit service valve.
2) Check the connection of the pipe.
3) Check the operation of the EEV.
4) Check the refrigerant leakage.
5) Check the connection of the indoor unit PBA EVA sensor.
6) Check the fault in the indoor unit EVA sensor.
2. Check procedure
If there occurs E422 error, reset the power and check
in the following order.
Is outdoor unit service valve opened?
Is connection of piping suitable?
(Check the disconnection, bent, or cross-connection
with other sets.)
Does operation error of refrigerant leakage
or EEV appear?
Is it defect of indoor machine EVA sensor
and connection state?
Yes
Yes
Yes
Check whether the pipe is empty and open all the
No
service valves on the gas and liquid pipes..
Modify the piping and connect immediately and then
No
empty the pipes and open the service valves.
Check the replacement of the EEV (body/coil) and the
No
refrigerant leaking part. After that, recharge.
Check the temperature value through S-NET, etc. and
No
then if there is a fault, replace and reconnect.
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