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6.8.2 Troubleshooting the 24 VAC Circuit
WATER LEVEL IN
COOKPOT IS ABOVE
LOWER WATER
LEVEL SENSOR AND
COMPUTER IS
ACTIVATED.
Is 24VAC
present on J2
Pin 7?
Probable cause is a
failed transformer.
Is LATCH
LED illuminated?
Probable cause is failed
computer or failed 15-pin
wiring harness.
Is combustion
air blower runing?
Is 12VDC
present on J4
pin 5?
Probable cause is a
failed computer.
Is cookpot filling?
Is HEAT LED
illuminated?
Is 24VAC
present on J2
Pin 4?
Probable cause is a
failed interface board.
Probable cause
is a failed interface board
or failed temperature
probe.
Is 24VAC
present on gas
valve?
24VAC circuit
is OK.
Is WATER LED
illuminated?
Probable causes are dirty
low water sensor or failed
interface board, in that
order.
Probable causes are blown
ignition module fuse, failed
ignition module, or failed
centrifugal switch in blower, in
that order.
Is 24VAC
present on J2
pin 2?
Probable causes are
grounded high water level
sensor or failed interface
board.
Probable causes are
failed solenoid valve or
broken or loose wire.
Yes
Yes
Yes
No
Yes
Yes
No
No
Yes
No
No
No
No
Yes
No
Yes No
Yes
Yes
No