Samsung AC052MN4DKH Service Manual page 79

Troubleshooting
4-3-20
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?
4-44
Yes
Yes
Yes
No
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
No
then empty the pipes and open
Check the replacement of the EEV (body/coil)
No
and the refrigerant leaking part.
Check the temperature value through S-NET,
No
etc. and then if there is a fault,
the service valves.
After that, recharge.
replace and reconnect.
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