St Nd - Samsung AM009FN1DCH/AA Service Manual

Troubleshooting
4-4-18 Simultaneous opening of Cooling/heating MCU SOL Valves 1
During the first detection, as the system restarts after making an automatic stop to check a problem with the system
During the second detection, please refer to the following check-up methods.
1. How to check
Are an indoor unit address,
cooling/heating position of the
MCU SOL VALVE connector correctly
Is a coil of MCU SOL VALVE
after replacing MCU SOL VALVE coils, does the
Replace MCU SOL VALVE BODY
4-44
connected?
Yes
Correctly connected?
Yes
When you restart it
same error occur again?
Yes
/2
st nd
Check the indoor unit address,
No
cooling/heating position and make
the correct connection.
No
Check the coil connection
and fasten it again
No
Replace coils as they are defective.
Samsung Electronics