Sunlight Supply Samsung Programmable Thermostat for Split Systems User Manual

Page 94

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No power indoor (Initial Diagnosis) (Not displayed)

1.Checklist :
1) Is input power normal?
2) Is AC power linked correctly?
3) Is input voltage of DC_link capacitor normal?
4) Is the voltage of DC regulator normal?
2. Troubleshooting procedure

Is the power cable from outdoor is

correct? (L, N - CN71)

YES

Reconnect the power cord correctly.

NO

YES

Press the power bu

Ʃon on the

display board

The remote control signal reciever on the display
PBA is wrong
Check the display board

NO

YES

Is the DC_link voltage normal?

C102(+)-C101(-) :270Vdc~320Vdc

Exchange the PBA

NO

Is the SMPS is normal?

IC102 : 12Vdc-GND-5Vdc

Exchange the PBA

YES

NO

YES

Exchange the PBA

Check the fuse open or not?

(F701,F702)

Exchange the PBA

NO

Is the power normal?

Restart a

Ōer power oī.

Check the power source.

Unplug the power cord

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