Samsung AC100JNCDEH/EU Service Manual page 64

4-3-22 Pipe Blocking Error (Error Code: E422)
1. Test Item
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.
Check the opening of the outdoor unit
service valve.
Check the connection of
the pipes (such as disconnection, bent, or
cross-connection with other sets).
Check the EEV operation and
the refrigerant leakage.
Check the fault in the indoor unit EVA
sensor and the connection state.
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Yes
Yes
Yes
No Check whether the pipe is empty and open all
the service valves on the gas and liquid pipes.
Change and connect the pipes immediately
No
and empty the pipes and then open the service
Check the replacement of the EEV (body/coil)
No
and the refrigerant leaking part. After that,
recharge.
Check the temperature value through
No
S-NET, etc. and then if there is a fault, replace
and reconnect.
Troubleshooting
valves.
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