Samsung NS140HHXEA Service Manual page 49

4-6-5 In case of heating at the cooling mode or cooling at the heating mode
1. Troubleshooting procedure
Is the Thermo off?
Is the unit
in the defrosting operation?
Is the compressor
in 3 minutes off?
Is much frost
in the indoor heat
exchanger?
Does the
4-WAY valve operate
normally?
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No
No
No
Yes
outdoor heat exchanger attached
No
No
apply to the connector of 4-WAY
Yes
Change the setting temperature of
remote control.
Yes
Operate it with a heating mode
as soon as the defrosting is finished.
Yes
After 3 minutes, cooling
and heating start automatically.
Is the
outdoor air sensor and
correctly?
Yes
Is the
4-WAY valve connector
connected correctly?
Yes
Check the resistance value
of 4-WAY valve coil.
OK
Dose the
voltage of AC220V
valve coil during the
operation?
Yes
4-WAY valve main body error
No
Attach the
sensor correctly.
Over shortage
of the refrigerant
No
Connect the connecter
correctly.
NG
4-WAY valve coil error
No
Exchange
the outdoor PCB.
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