X hits on this document

22 views

0 shares

0 downloads

0 comments

6 / 6

TECHNICAL HELP

TROUBLESHOOTING GUIDE

INTEGRATED FURNACE CONTROL MODULE

CHART 5

5A

5B

5C

Flame Sensor Check

Does main burner remain lit?

YES

Does ignitor remain energized with flame present?

NO

Is blower at heat speed within 1 minute of burner ignition?

YES

System is functioning properly.

NO

YES

NO

5E

De-energize system. Disconnect 12-pin connector. Connect ohmmeter from flame sensor pin FP to burner GROUND.

5D

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

YES

Repair wiring and/or replace indoor blower motor. Check operation.

NO

Replace control module. Check operation.

5F

5I

5L

5M

Is resistance less than 50 megohms (50,000,000 Ohms)?

NO

Disconnect flame sensor from wire. Measure continuity from wire end to FP pin on 12-pin connector.

Disconnect AC power to system at main fuse or circuit breaker. Connect voltmeter from control terminal LINE NEUTRAL to BURNER GROUND. Energize module.

Is 120V present at burner ground?

YES

Reverse 120V LINE & NEUTRAL wires. Energize system. Check operation.

YES

NO

5G

5J

5K

YES

5N

Disconnect lead from flame sensor. Connect ohmmeter from sensor to burner ground.

Is sensor lead good?

YES

Is control ground wire connected to burner ground?

Connect a microammeter in series with flame sensor and sensor lead. Energize system. Measure current when burner ignites.

Clean surface of flame sensor with fine steel wool. Reinstall. Check operation.

NO

NO

5O

5P

YES

5H

Repair or replace wire. Energize system. Check operation.

Connect ground wire from burner to 12-pin connector terminal GROUND. Check operation.

Is 1 microamp or more present?

NO

Remove sensor. Does sensor have carbon or dust buildup?

Is resistance less than 50 megohms?

NO

YES

NO

YES

Replace sensor. Energize system. Check operation.

Replace flame sensor lead. Check operation.

Replace control. Check operation.

!

WARNING

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

270

www.white-rodgers.com

Document info
Document views22
Page views22
Page last viewedMon Jan 23 09:03:27 UTC 2017
Pages6
Paragraphs385
Words1716

Comments