Troubleshooting The 24 Vac Circuit - Frymaster Gas Rethermalizers FBKR18 Series Installation & Operation Manual

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?
Yes
Is LATCH
LED illuminated?
Yes
Is combustion
air blower runing?
Yes
Is cookpot filling?
No
Is WATER LED
illuminated?
Yes
Is 24VAC
present on J2
pin 2?
Yes
Probable causes are
failed solenoid valve or
broken or loose wire.
Probable cause is a
No
failed transformer.
Probable cause is failed
No computer or failed 15-pin
wiring harness.
Is 12VDC
No present on J4
pin 5?
Yes
Is HEAT LED
Yes
illuminated?
No
Probable cause
is a failed interface board
or failed temperature
probe.
Probable causes are dirty
low water sensor or failed
No
interface board, in that
order.
Probable causes are
grounded high water level
No
sensor or failed interface
board.
Probable cause is a
No
failed computer.
Is 24VAC
Yes present on J2
Pin 4?
Yes
Is 24VAC
present on gas
valve?
No
6-14
Probable cause is a
No
failed interface board.
24VAC circuit
Yes
is OK.
Probable causes are blown
ignition module fuse, failed
ignition module, or failed
centrifugal switch in blower, in
that order.