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6.8.3 Troubleshooting the 24 VAC Circuit in FBRA18 Units
UNIT IS CONNECTED TO
POWER SUPPLY, DRAIN
VALVE IS FULLY CLOSED,
NO WATER IS IN POT,
CONTROLLER IS ON.
Is POWER
LED lit?
Yes
Is WATER
LED lit?
Yes
Is unit filling
with water?
Yes
Once water
reaches upper water
level sensor, does filling stop
and WATER LED
go out?
Yes
Water leg of 24V
circuit is OK.
Go to
No
"A".
Ensure upper water level
sensor is not grounded (i.e., 24VAC
present across sensor and cabinet). If
No
sensor is not grounded, most
probable cause is failed
interface board.
Most probable cause is
a failed solenoid, but may
No
also be a failed water relay on
interface board or failed
interface board.
Is WATER
No
LED lit?
Most probable cause is dirty upper
water level sensor, but could also be a
loose connection between sensor and
interface board, or a failed interface
board.
6-16
Most probable cause
is failed solenoid, but may
No
also be a failed water relay
Yes
on interface board.
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Troubleshooting
