Sunlight Supply Samsung Programmable Thermostat for Split Systems - Manual (Page 94)

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