Eev(Electronic Expansion Valve) Opening Malfunction (2Nd Stage) - Samsung AM056FN2DEH Series Service Manual

4-4-12 EEV(Electronic Expansion Valve) opening malfunction (2nd stage)

Outdoor unit display
Indoor unit display
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
Detect only on cooling operation. (No detection during heating operation.)
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 with-
out cessation.
2. How to check
Is the EEV wire connected to the PCB?
connected to the main body
the coil terminal resistance, is there a disconnection or short
the Outdoor Unit, does an error occur
even after running it again with
• 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
1st detection : P703 (Outdoor Unit display only)
2nd detection :
Yes
Is the EEV coil
properly?
Yes
After measuring
circuit inside the coil?
No
After Resetting
the same combination?
Yes
Replace EEV coil
x x x ( x x x : The address of the error occurred indoor unit )
No
Connect to PCB and restart operation.
No
Yes
No
Connect the EEV coil properly and
restart operation.
Replace EEV coil.
Normal operation of EEV.
Troubleshooting
433