GE Advantium 120 SCA1000, Technical Service Manual

Page: 47 / 74

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Oven/Bake Under Temperature
Set Oven/Bake for
250° F.
Does preheat
display?
Check fuse on sub
PCB.
Fuse OK?
Replace fuse. NO
Check resistance
of sheath heater.
Heater OK?
YES
Replace heater. NO
Check relay RY7
on sub PCB.
Relay OK?
YES
Check harness and
connectors between
sub PCB and main
PCB. If OK, replace
sub PCB. If problem
not corrected, replace
main PCB.
NO
YES
Does lower heater
come on?
NO
Check resistance
of lower heater.
Heater OK?
YES
Replace heater. NO
YES
Replace main
PCB.
YES
Replace
thermistor.
NO
Do sheath and
lower heaters
come on?
YES
See Display Does
Not Operate
Correctly chart.
NO
Check Thermistor.
Thermistor OK?
Check relay RY9
on main PCB.
Relay OK?
Open lower heater
circuit.
YES
Replace main
PCB.
NO
Open in the upper
heater circuit.
NO
YES
Perform Damper
Door Test.
Pass test?
YES
Repair or replace
damper.
NO