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INTEGRATED FURNACE CONTROL MODULE

Main Burner

Does ignitor

Ignition Check.

warm up and

Inducer ON.

glow?

4A

CHART 4

YES

4E

YES

Does burner ignite?

NO

NO

4B

Turn power OFF to furnace. Unplug ignitor from wire harness. Connect voltmeter across ignitor wiring harness leads from control. Energize system.

4F

Is gas valve manual knob in ON position?

NO

4G

YES

Turn manual knob to OFF position. Connect manometer to outlet pressure tap. Turn knob to ON position. Energize system.

4C

4H

Replace ignitor. Check operation.

YES

Is 120V present at ignitor leads?

Is outlet pressure detected after ignitor warm- up time?

YES

NO

NO

4K

Is gas at source?

NO

YES

4D

4L

Replace broken or defective wiring. Check operation.

YES

Is 120V present at control terminals IGN & IGN NEUTRAL?

Connect voltmeter to gas valve leads. Energize system.

NO

4M

Is 24V detected across gas valve leads after ignitor warm- up time?

NO

YES

Replace control. Check operation.

Replace gas valve. Energize system. Check operation.

www.white-rodgers.com

TROUBLESHOOTING GUIDE

Turn manual knob to ON position. Check operation.

Purge system of air. Energize system. Check operation.

4I

4J

YES

Refer to service facts or installer’s guide for proper pressure settings.

Is manifold pressure adjusted to required setting?

NO

Adjust manifold to required pressure setting. Check operation.

Restore gas supply at source. Check operation.

4N

Is 24V present across control MV terminals after ignitor warm- up time?

NO

Replace control module. Check operation.

YES

Repair or replace broken leads to gas valve. Check operation.

!

WARNING

If diagnostic indicator (LED) shows continuous flashing, turn off gas supply at source before disconnecting electrical power!

269

TECHNICAL HELP

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