Troubleshooting
4-53
4-4-21.
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
Yes
Yes
Yes
If there occurs E422 error, reset the power
and check in the following order.
Check whether the pipe is empty and open all
the service valves on the gas and liquid pipes..
Modify the piping and connect immediately
and then empty the pipes and open the service
valves.
Check the replacement of the EEV (body/coil)
and the refrigerant leaking part. After that,
recharge.
Check the temperature value through S-NET,
etc. and then if there is a fault, replace and
reconnect.
No
No
No
No
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?
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