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TECHNICAL HELP

TROUBLESHOOTING GUIDE

CHART 1

1A

Indoor Blower Check

Place thermostat fan switch in the ON position.

Does indoor blower run at HEAT speed?

YES

flash 1 time

YES

present at

YES

present at

when disconnect

control

control

is turned

terminals

terminals

ON?

R & C?

G & C?

NO

NO

NO

1C

Does LED

NO

1D

Is 24V

1E

Is 24V

YES

Replace control. Check operation.

1G

1H

NO

1I

Is 120V present across control terminals LINE & LINE NEUTRAL?

YES

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

YES

Is 120V present across primary of control transformer?

YES

NO

NO

Correct 120V power supply. Check operation.

Repair wiring to transformer. Check operation.

!

WARNING

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

266

www.white-rodgers.com

INTEGRATED FURNACE CONTROL MODULE

1B

Return fan switch to AUTO position.

1F

Is 120V present at control terminals COOL & CIR NEUTRAL?

YES

Indoor blower fault. Repair or replace. Check operation.

NO

Replace control. Check operation.

Repair wiring from control to thermostat. Check operation.

1J

1K

Is 24V present across secondary of transformer?

YES

Is 24V present across 12-pin connector pins TH & TR on the control?

YES

NO

NO

Replace transformer. Check operation.

Repair wiring and/or plug connection. Check operation.

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