Samsung RS261M Series - 4-18) When Water Tank Heater Does Not Operate

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4. TROUBLESHOOTING
4-18) When Water Tank Heater does not operate
If it is 0Ω, Check if Heater is broken.
If it is
∞Ω, Check if wire is broken.
If it is abnormal resistance, replace
Heater.
Replace RY77
Resistance between
CN72 #9 & CN70 #3 is about 3.6k
(AC 115V) or 13k(AC 230V)
YES
NO
The voltage
across CN70 #3 & CN72#9 is about
AC 230V(or 115V)
Start
MAIN PBA normal
-- Check other parts.
① Check Water Tank Heater Wire.
② Check if the Heater is open.
Do Foroed Operation and
check it again with Comp on.
YES
YES
Comp is operating
NO
Replace Main PBA
(Micom or IC73 defect)
YES
The voltage at
IC73 #12 is abour oV
NO
YES
NO
Before reading resistance,
plug out the unit and
plugout the designated
connerctor from the Main
PBA.