TOA Electronics B-40REN, B-40REP, B-40RMN, B-40RMP manual 15

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. Faulty limit switch.				Reset the limit switch button. If still not working, remove wire nut from the leads attached
							to the limit switch and check for continuity. If no continuity, replace limit switch.
			C. “OFF/ON” or wall switch				Disconnect the two black wires from the wire nuts. Test switch(s) for continuity with
				defective.			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 connec-
							tions 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

Proper Lead, This Check Must Be Done With The

Line Volt Supply.

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.

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