Electronic Expansion Valve Opening Malfunction (2Nd Stage) - E135 - Samsung AM009FN1DCH/AA Service Manual

System air conditioner indoor unit
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Troubleshooting
4-4-9 Electronic Expansion Valve opening malfunction (2nd stage) -
Outdoor unit display
Indoor unit display
Criteria
Cause of problem
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.)
4-36
1st detection : P703 (Outdoor Unit display only)
2nd detection :
×(Operation)
×(Timer)
Refer to the judgment method below.
Faulty Indoor Unit EEV action. (Refrigerant will leak into the stopped Indoor Unit.)
Yes
Yes
After measuring
No
After Resetting
combination?
Yes
Replace EEV coil
x x x ( x x x : The address of the error occurred indoor unit)
(Fan)
×(Filter)
×(Defrost)
No
No
Yes
Connect to PCB and restart operation.
Connect the EEV coil properly and
restart operation.
Normal operation of EEV.
No
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