TOA Electronics P0055-DRG manual Troubleshooting the Electronic Ignition System

Page 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: “ON/OFF” switch must be “OFF” before performing continuity test. Adjust multimeter to the ohm setting when performing continuity tests.

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

SYMPTOM

 

POSSIBLE CAUSES

CORRECTIVE ACTION

1. No spark and no pilot gas.

A. Faulty transformer.

Confirm 24Vac output from transformer (red and blue leads). If no, then replace

 

 

 

 

transformer.

 

 

 

 

Note: Before replacing transformer check wiring for loose connections or broken wires

 

 

 

 

and repair as needed. Turn off power before replacing transformer.

 

 

 

 

 

 

 

 

B. “ON/OFF” switch defective.

Disconnect the two black wires from the two red wires attached to the limit switch and

 

 

 

 

transformer (label wires for correct reattachment). Test “ON/OFF” wall switch for

 

 

 

 

continuity with a multimeter. If continuity is not indicated, switch is defective and must

 

 

 

 

be replaced.

 

 

 

 

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

 

 

 

 

connections or broken wires and repair as needed.

 

 

 

 

 

 

 

 

C. Limit switch defective.

Reset the limit switch button. If still not working, isolate the limit switch in the same manner

 

 

 

 

as the “ON/OFF” switch (label wires for correct reattachment) and test for continuity with

 

 

 

 

a multimeter. If continuity is not indicated, switch is defective and must be replaced.

 

 

 

 

 

 

 

 

D. Ignition control module defective.

If reading is not 24V at “TH” and “TR” terminals on ignition control, replace ignition

 

 

 

 

control module.

 

 

 

2. Spark but no pilot gas

A. No gas supplied to pilot valve.

Check for availability of gas at control. Check that manual valve upstream of gas control

(no solenoid valve click).

 

and manual valve on gas control are in the full “ON” position. Check for plugged pilot

 

 

 

 

orifice or plugged pilot tubing. Also check pilot key adjustment at gas control valve.

 

 

 

 

 

 

 

 

B. Faulty gas valve.

Confirm 24Vac at gas valve terminals “C” and “P” of the gas valve. If yes, valve is OK. If

 

 

 

 

no voltage, check the wiring. If wiring tests OK, check ignition control module.

 

 

 

 

 

 

 

 

C. Ignition control module defective.

Confirm 24Vac at “PV” and “PV/MV” on ignition control module. If no, replace the ignition

 

 

 

 

control.

 

 

 

3. Spark but no pilot gas

A. Gas supply to pilot restricted.

Check if pilot line and pilot orifice are plugged. Clean or replace as necessary. Adjust pilot

(solenoid valve click).

 

flame if necessary.

 

 

 

4. Pilot gas available, but

A. Ignition control or igniter

Confirm that the igniter is sparking at the pilot assembly when the “ON/OFF” switch is

pilot does

not

light

defective.

activated. If not, undertake the following steps:

(solenoid click).

 

 

With “ON/OFF” switch “OFF,” remove wire at “TR” terminal at the ignition control module.

 

 

 

 

 

 

 

 

Disconnect the electrode wire “IGN” at the ignition control. Connect one end of a jumper

 

 

 

 

wire to the metal blade of a small screwdriver. Attach the other end of the jumper wire to

 

 

 

 

any metal part of the chassis. Reconnect the “TR” terminal. Position end of metal blade

 

 

 

 

approximately ¹⁄₈" (3 mm) from the “IGN” terminal. Activate the “ON/OFF” switch.

 

 

 

 

Sparking should occur between the “IGN” terminal and screwdriver blade. If sparking

 

 

 

 

does occur, the ignition control module is OK, but either the electrode wire of the igniter

 

 

 

 

is faulty and the pilot and electrode assembly should be replaced.

 

 

 

 

 

 

 

 

B. Sparking, but not at proper

Electrode tip needs to be realigned to correct location. ³⁄₃₂" to ¹⁄₈" (2 – 3 mm) gap between

 

 

 

location.

electrode tip and pilot hood is desired.

 

 

 

5. Pilot burning but main

A. Low pilot flame or improper

Pilot and electrode igniter must be properly aligned so that the pilot flame impinges the

burners will not come on.

alignment of electrode igniter in

top ³⁄₄" (19 mm) of the electrode igniter. The electrode igniter must be pushed all the way

Note: Wait at least 90

pilot flame.

into the pilot bracket. Adjust pilot flame if necessary.

 

 

 

 

seconds after

pilot

lights

B. Burner orifice(s) plugged.

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

before doing the checkout

 

 

 

 

for possible causes.

 

C. Gas valve defective.

Check for 24 volts at gas operator terminals “M” and “C.” If there is a 24V reading and the

 

 

 

 

burner does not come on, the valve operator is defective and the gas valve must be

 

 

 

 

replaced.

 

 

 

6. Burners come “ON” but go

A. Low pilot flame or electrode

Adjust pilot flame and/or check location of electrode igniter.

“OFF.”

 

 

igniter not correctly positioned.

 

15

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