TROUBLESHOOTING

Note: Before troubleshooting the gas control system, Ensure external gas shut off valve, located at gas supply inlet, (and wall switch, iff applicable), is

in the “ON” position. Important: Valve system troubleshooting should only be accomplished by a qualified service technician.

 

TROUBLESHOOTING GUIDE - MILLIVOLT GAS CONTROL SYSTEM

 

SYMPTOM

POSSIBLE CAUSES

CORRECTIVE ACTION

1.

Spark Igniter will not light pilot after

A. Defective igniter

Check for spark at electrode and pilot; if no spark

 

repeated triggering of Igniter button.

(no spark at electrode).

and electrode wire is properly connected, replace

 

 

 

Igniter.

 

 

B. Defective or misaligned electrode at pilot

Using a match, light pilot. If pilot lights, turn off pilot

 

 

(spark at electrode).

and trigger the igniter button again. If pilot lights, an

 

 

 

improper gas mixture caused the bad lighting and

 

 

 

a longer purge period is recommended. If pilot will

 

 

 

not light – check gap at electrode and pilot – should

 

 

 

be 1/8" to have a strong spark. If gap measures 1/8",

 

 

 

replace pilot (see Figure 8 on Page 8).

 

 

C. Gas supply pressure errant.

Check inlet gas pressure. It should be within the limits

 

 

 

as marked on the rating plate.

 

 

D. Pilot orifice plugged.

Clean or replace pilot orifice.

 

 

 

 

2.

Pilot will not stay lit after

A. Defective pilot generator

Check pilot flame, it must impinge on thermocouple

 

carefully following the lighting

(thermocouple).

(see Figure 8 on Page 8). Clean and/or adjust pilot

 

instructions.

 

for maximum flame impingement on thermocouple.

 

 

Ensure that the connection between the valve and

 

 

 

 

 

 

thermocouple are tight and secure.

 

 

 

 

3.

Pilot burning, no gas to burner, Valve

A. Limit Switch defective.

Isolate the “limit” switch. Disconnect the wires from

 

knob “ON,” Wall Switch “ON.”

 

the “ON/OFF” switch and the valve (label wires for

 

 

 

reattachment). Test for continuity with a multimeter.

 

 

 

If continuity is not indicated, switch is defective and

 

 

 

must be replaced.

 

 

B. Wall switch or wires defective.

Check wall switch and wires for proper connections.

 

 

 

Jumper wire across terminals at wall switch, if burner

 

 

 

comes on, replace defective wall switch. If okay, jumper

 

 

 

wires across wall switch wires at valve, if burner comes

 

 

 

on, wires are faulty or connections are bad.

 

 

C. Thermopile may not be generating suf-

Check thermopile with millivolt meter. Take reading

 

 

ficient millivoltage.

at thermopile terminals of gas valve. Should read

 

 

 

325 millivolts minimum with optional wall switch

 

 

 

“OFF.” Replace faulty thermopile if reading is below

 

 

 

specified minimum.

 

 

D. Plugged burner orifice.

Check burner orifice for stoppage and remove.

 

 

 

 

4.

Frequent pilot/burner outage prob-

A. Pilot flame may be too low or blowing (high)

Clean and/or adjust pilot flame for maximum flame

 

lem.

causing the pilot/valve safety to drop out.

impingement on thermocouple (see Figures 8 on

 

 

 

Page 8).

 

 

 

 

 

TROUBLESHOOTING GUIDE - ELECTRONIC IGNITION SYSTEM

 

 

 

 

 

 

 

 

SYMPTOM

 

POSSIBLE CAUSES

 

CORRECTIVE ACTION

 

1.

Burner will not light.

A. Faulty Valve System.

 

See Below.

 

 

 

 

 

 

 

 

 

 

 

B. “OFF/ON” or wall switch defective.

 

Disconnect the two black wires from the wire nuts.

 

 

 

 

 

 

 

Test switch(s) for continuity with a multimeter. If

 

 

 

 

 

 

 

continuity is not indicated, switch(s) is defective and

 

 

 

 

 

 

 

must be replaced.

 

 

 

 

 

 

 

Note: Before replacing “OFF/ON” switch, Ensure to

 

 

 

 

 

 

 

check wiring for loose connections or broken wires

 

 

 

 

 

 

 

and repair as needed.

 

 

 

 

 

 

 

 

 

2.

Burners come “ON,” then turns “OFF.”

A. Burner orifice plugged.

 

Check main burner orifice(s) for blockage. Clean

 

 

 

 

 

 

 

or replace.

 

 

 

 

 

 

 

 

 

 

 

B. Obstructed vent system.

 

Check vent system for obstructions.

 

23

 

 

 

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

 

 

 

 

 

 

 

 

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Image 23
LG Electronics MPB3328CNE manual Symptom Possible Causes Corrective Action
Page 22 Page 24

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