TROUBLESHOOTING THE ELECTRONIC IGNITION SYSTEM

Note: Before troubleshooting, be sure that the appliance main line gas shut-off valve, the gas control valve and the wall switch are in the “ON” position.

Important: Valve system troubleshooting should only be accomplished by a qualified service technician.

 

 

SYMPTOM

 

POSSIBLE CAUSES

 

 

 

CORRECTIVE ACTION

 

 

 

 

 

 

 

 

 

 

 

 

 

1.

Burner will not light.

A. Faulty Valve System.

See Below.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

B. “OFF/ON” or wall switch

Disconnect the two black wires from the wire nuts. Test switch(s) for

 

 

 

 

defective.

continuity with a multimeter. If continuity is not indicated, switch(s) is

 

 

 

 

 

 

 

 

defective and must be replaced.

 

 

 

 

 

 

 

 

Note: Before replacing “OFF/ON” switch, be sure to check wiring for loose

 

 

 

 

 

 

 

 

connections or broken wires and repair as needed.

 

 

 

 

 

 

 

 

 

 

 

 

 

2.

Burners come “ON” but

A. Burner orifice plugged.

Check main burner orifice(s) for stoppage. Clean or replace.

 

 

go “OFF.”

 

 

 

 

 

 

 

 

 

 

 

 

B. Obstructed vent system.

Check vent system for obstructions.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

START

 

 

 

 

 

 

 

 

CHECK

 

• Turn Off Gas Supply

 

 

 

• Check For Proper Voltage At Control Harness

NO

• Line Voltage Power

 

 

• Assure Valve Switch Is In ON Position

 

 

 

(See Insert A). Voltage Should Be 24V

• Low Voltage Transformer

 

 

• Disconnect Control Harness

 

 

 

Between Thermostat Or Pressure Switch

 

 

• Limit Controller

 

 

• Set Thermostat To Call For Heat

 

 

 

And 24V Common And 24V Hot.

2

 

 

• Thermostat

 

 

 

 

 

 

 

 

 

 

 

• Wiring

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

•Plug Control Harness Into Valve. Wait For Internal Check Delay.

 

 

 

 

 

 

 

NO

 

• With Pilot Burner Cable Connected, Measure

 

NO

 

Insert A

End View Of

 

• Igniter Warms Up And Glows Red.

 

 

 

Voltage At Valve HSI Element Output. 24V

 

 

 

 

• Replace Valve.

 

 

 

 

 

 

 

 

 

Control Harness

 

 

 

 

 

 

 

Nominal. (See Insert B)

2

 

 

 

 

 

 

 

Connector

 

 

 

 

 

 

 

1

 

 

 

 

 

 

24 Volt Hot

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24 Volt

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Common

 

 

1

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Replace Igniter/Flame Rod Assembly.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24 Volt

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

Switched

 

 

 

 

 

NO

 

 

 

 

 

NO

 

Check For Damaged Or Missing Terminals

 

• Turn On Gas Supply.

• Pilot Burner Lights.

 

• Check That Pilot Gas Is Flowing. Wait To

 

 

• Replace Valve.

 

 

 

 

Assure Plot Gas Tubing Is Purged. Recycle

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

In Connector

 

 

 

 

 

 

 

 

Call For Heat If Necessary.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Measure Voltage Between 24V Hot And 24V Common

 

 

 

 

 

 

 

 

 

 

 

 

 

Leads To Valve Control. Must Measure At Least 19.5

NO

 

 

 

 

 

 

 

 

 

 

VAC With Igniter Powered (See Insert A). To Identify

• Check Transformer And

 

Insert B

 

 

 

 

 

 

 

 

 

 

Line Volt Supply.

 

 

 

 

 

 

 

 

Proper Lead, This Check Must Be Done With The

 

 

 

 

Igniter Terminals

 

 

 

 

YES

 

 

Valve Control Connected And Igniter Powered.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Replace Pilot Assembly.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• Check That Pilot Flame Makes Good Contact With

 

 

 

 

 

 

 

 

 

 

 

NO

Pilot Burner Flame Rod.

 

 

 

 

 

 

 

 

 

 

• Main Valve Opens And Main Burner Lights.

• Check For Good Electrical Connection Through The

 

 

 

 

 

 

 

 

 

 

 

 

 

Pilot Tubing.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• If Both Of The Above Are Good, Replace Igniter/Flame

 

 

 

 

 

 

 

 

 

 

YES

 

 

Rod Assembly.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

• System Is Okay.

 

 

 

 

• Cycle Thermostat Off And Back On.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

Igniter Will Cycle Off And Back On Once During

 

When Measured Voltage At Connections, Use

 

 

 

 

 

NO

 

 

 

 

 

 

 

 

 

 

2

 

• Main Burner Lights.

 

 

 

• Replace Valve.

 

The 90 Second Ignition Trial. All Voltage

 

Care To Assure Terminals Are Not Damaged.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Measurements Must Be Taken While The Igniter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Is Powered.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

21