Electronic Expansion Valve Opening Malfunction (2Nd Stage) - Samsung AM032MNQDCH/AA Service Manual

4-4-9 Electronic Expansion Valve opening malfunction (2nd stage) -

1st detection : P703 (Outdoor Unit display only)
Outdoor unit display
2nd detection :
Indoor unit display ×(Operation)
Criteria • Refer to the judgment method below.
Cause of problem • Faulty Indoor Unit EEV action. (Refrigerant will leak into the stopped Indoor Unit.)
1. How to diagnose
- During Cooling operation, the temperature of the inlet or outlet of stopped Heat Exchanger is kept lower than 0˚C for more than
20 minutes without cessation.
- Hydro Unit : During the defrost operation, detection from stop-side Indoor Unit. (Temperature of the inlet of Heat Exchanger is
kept lower than 0˚C for more than 20 minutes without cessation.)
2. How to check
Is the EEV wire connected to the PCB?
Is the EEV coil connected to the main body properly?
the coil terminal resistance, is there a disconnection or
short circuit inside the coil?
the Outdoor Unit, does an error occur even after
running it again with the same
* How to turn off the Hydro Unit E151
- Hydro Unit PCB k1, k2 switch : At the same time push for more than 4 seconds.
- After resolving the cause of the error, restart operation.
(Excessive reset operation, can cause damage to the Heat Exchanger.)
Samsung Electronics
x x x ( x x x : The address of the error occurred indoor unit)
×(Timer) ◑(Fan)
Yes
Yes
After measuring
No
After Resetting
combination?
Yes
Replace EEV coil
×(Filter) ×(Defrost)
No
Connect to PCB and restart operation.
No
Connect the EEV coil properly and
Yes
Normal operation of EEV.
No
전자 팽창밸브 정상 작동
Troubleshooting
restart operation.
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