Sunlight Supply Samsung Programmable Thermostat for Split Systems - Manual (Page 100)

12-37 Samsung Electronics
12-2-5 In case of heating at the cooling mode or cooling at the heating mode
1. Troubleshooting procedure
Change the setting temperature of
remote control.
Operate it with a heating mode
as soon as the defrosting is finished.
After 3 minutes, cooling
and heating start automatically.
No
No
No
Yes
Yes
Yes
Is the Thermo off?
Is the unit
in the defrosting operation?
Is the compressor
in 3 minutes off?
Check the resistance value
of 4-WAY valve coil.
Go to the next page 4-WAY valve main body error
Attach the
sensor correctly.
Over shortage
of the refrigerant
Connect the connecter
correctly.
4-WAY valve coil error
Exchange
the outdoor PCB.
No
Yes
Yes
Yes
OK
Yes
No
No
No
NG
No
Is much frost
in the indoor heat
exchanger?
Does the
4-WAY valve operate
normally?
Is the
outdoor air sensor and
outdoor heat exchanger attached
correctly?
Is the
4-WAY valve connector
connected correctly?
Dose the
voltage of AC220V
apply to the connector of 4-WAY
valve coil during the
operation?