Frymaster Gas Rethermalizers FBRA18 Series User Manual

Page 41

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6-14

6.8.2 Troubleshooting the 24 VAC Circuit in FBR18 Units

NOTE: All voltage measurements must

be made within 4 seconds of unit

calling for heat. If unit does not fire

within 4 seconds, ignition modules will

lock out and controller must be turned

off then back on to reset.

UNIT IS CONNECTED TO

POWER SUPPLY, DRAIN VALVE

IS FULLY CLOSED, CONTROLLER

IS ON AND IS CALLING FOR HEAT

(decimal appears between first
two digits in controller display).

Is 24VAC present on

interface board J3 pin 9

(LED 5 (GV) lit)?

Is 24VAC

present across the gas

valve main coil (PV

terminal)?

24V circuit is

OK.

Probable cause is

failed wire between

interface board and gas

valve.

Is LED 3 (24V) lit

continuously?

Is LED 4

(PWR) lit?

Is LED 2

(PWR) lit?

Is 24VAC

present on 25V terminal

of LEFT ignition

module?

Is 24VAC

present on VALVE

terminal of ignition

module?

Probable cause is

failed wiring harness.

If fuse is not blown,

module has failed.

Is 24VAC

present on 25V terminal

of RIGHT ignition

module?

Probable causes are failed

wiring between blower centrifugal

switch and module, failed centrifugal

switch, or failed wiring harness.

Check for 12VDC across interface

board J2 pins 4 & 5 when controller is calling

for heat. If 12VDC is not present, probable

causes are failed controller or failed relay on

interface board. On later design boards, relay K3

may be replaced. On earlier design boards,

the entire interface board must be

replaced..

Probable causes are failed

24V transformer or failed

wiring between transformer

and interface board.

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