Samsung SH18BW6 Service Manual page 35

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?
in the defrosting operation?
Is the compressor
in 3 minutes off?
Indoor operation SW is on.
Is much frost
in the heat exchanger?
4 way valve operate
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12-7
No
Is the unit
No
No
Yes
Yes
No
Does the
No
normally?
Yes
Change the setting temperature of
Yes
Operate it with a heating mode
as soon as the defrosting is finished.
Yes
and heating start automatically.
No
Is the
outdoor air sensor and
outdoor heat exchanger attached
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.
After 3 minutes, cooling
Turn the SW On.
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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