Samsung AQV12NSA Service Manual page 61

Troubleshooting
12-2-6 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?
Indoor operation SW is on.
Is much frost
in the heat exchanger?
Does the
4 way valve operate
normally?
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No
No
No
Yes
Yes
outdoor heat exchanger attached
No
No
Yes
Change the setting temperature of
Yes
Operate it with a heating mode
as soon as the defrosting is finished.
Yes
After 3 minutes, cooling
and heating start automatically.
No
Turn the SW On.
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 AC 220V
apply to the connector of 4 way
valve coil during the
operation?
Yes
4 way valve main body error
remote control.
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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