Electrical Malfunction - Samsung FTQ353IWUB Service Manual

4. Troubleshooting

4- Electrical Malfunction

Safety error
No power
or
No display
*Check terminal block voltage.
AC 240V/120V or AC208V/120V
Yes
*Thermostat open check. (150°c / 0°c )
Yes
*Check the pin voltage of connector
(CN01) on Main PCB.
(Input voltage : 120V)
Yes
＊Check the Low voltage Transformer
Low Voltage Transformer Low Voltage Transformer
IC03(7805) IC03(7805)
IC02(7812) IC02(7812)
L1 L1
(Black) (Black)
(Terminal Block) (Terminal Block)
No
No
**Reconnect and replace or
repair harness is damaged
No
Check whether varistor(ZNR1) on
main PCB has been damaged.
ZNR1 ZNR1
(Varistor) (Varistor)
Connector Connector
CN01(AC 120V) CN01(AC 120V)
40
L1
L2 L2
L1
(Red) (Red)
L2
N N
(White) (White)
* Reset the circuit breaker
or check main power.
END
* replace Thermostat.
Thermostat Thermostat
(150/0) (150/0)
Yes
* replace Main PCB.
L2 : 240V
N : 120V
N : 120V
END