6.8.3 Troubleshooting the 24 VAC Circuit in FBRA18 Units (Continued)

B

NOTE: All voltage measurements involving the gas valve leg of the 24V circuit 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.

Is 24VAC

present across the gas Yes valve main coil (PV)

terminal?

No

Gas valve leg of 24V circuit is OK.

Is

24VAC present on

VALVE terminal of LEFT Yes ignition module?

Probable cause is

failed wiring between module and gas valve.

No

Is 24VAC present

Yes

If fuse is not

on 25V terminal of LEFT

blown, module

 

ignition module?

 

has failed.

No

 

 

 

 

No

Is 24VAC

present on J2 Yes pin 4?

Is 24VAC present

on 25V terminal of RIGHT Yes ignition module?

Is

24VAC present on

VALVE terminal of RIGHT

ignition module?

No

No

Yes

Is 24VAC

present on J2 Yes pin 3?

No

Probable cause is

failed wiring between terminal block and J2 pin 3.

Probable causes are failed

Probable cause

wiring between blower centrifugal

switch and module, failed

is failed wiring

centrifugal switch, or failed

harness.

wiring harness.

 

Probable cause

 

is failed CYCLE

 

relay.

 

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Page 45
Image 45
Frymaster FBR18 Series manual Harness

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