St Nd - Samsung AM007FN1DCH/AA Service Manual

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
Samsung Electronics
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.
Troubleshooting
4-57