Troubleshooting – LG B-VENT GAS GC3 User Manual

Page 20

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SYMPTOM

PROBABLE CAUSE

CORRECTIVE ACTION

Thin black coating (soot)

forms on the viewing

glass, logs, or firebox

1) Improper log or

ember placement

) Improper air shutter

setting

) Not enough combus-

tion air

4) Incorrect gas pres-

sure

1) See Log Set Installation on Pages 9 & 10. If there is soot in one specific location, the

rockwool below this location needs to be adjusted. This can be done by pulling embers

forward slightly. If the flames have soot tails, the shutter will need to be opened.

) If sooting continues open air shutter (see Air Shutter Adjustment on Page 12)

) Check for debris obstructing air flow in valve compartment under insert or in front of

lower venting.

4) Have gas supplier check for correct gas pressure (7" W.C. natural gas: 11" W.C. pro-

pane gas)

Humming or whistling

coming from insert.

1) Normal operating

noise

) Obstructed orifice

opening

) Defective regulator

1) See Quiet Operation on Page 15. The noise may be reduced by slightly turning down

the flame. Turning the flame down will reduce the heat output of the insert.

) If noise is excessive or is “whistling” have your gas supplier check the regulator and

orifices and replace if necessary.

) If noise is excessive or is “whistling” have your gas supplier check the regulator and

orifices and replace if necessary.

A change in flame appear-

ance or burner operation.

1) A change in gas

pressure

) Improper ember

placement

1) Have your gas supplier check for correct gas pressure (7" W.C. / po. C.E. [1.74 kPa]

natural gas; 11" W.C. / po. C.E. [2.74 kPa] LP gas). NOTE: NEVER BLOCK OR OBSTRUCT

AIR INTAKE OR OUTLET VENTS.

) See Log Set Installation Instructions.

Spark igniter will not light

pilot after repeated tries.

1) No gas supplied to

unit or air in line

) Defective igniter (no

spark at electrode)

) Defective or mis-

aligned electrode at pilot

(spark at electrode)

1) Check gas supply. To purge, hold in gas cock on valve for 1-2 minutes and try again.

) Check for spark at electrode and pilot, if no spark and electrode wire is properly con-

nected, replace igniter and igniter wire.

) Using a match, light pilot. If pilot lights, turn off pilot and trigger the igniter again.

If pilot lights, an intermittent gas/air supply may be the problem, if longer purge will

not light - check gap between electrode and pilot - should be 1/8 inch (3 mm) to have a

strong spark. If OK, replace pilot.

Pilot will not stay lit after

carefully following lighting

instructions.

1) Vent Safety Snap

Switch shut down.

) Improper Flame

impingement

) Low gas inlet pres-

sure

4) Defective thermopile

5) Bad connection

6)Defective automatic

valve operator

1) Snap switch activated, have venting system inspected for blockage, down draft or

bad snap switch.

) Check pilot flame adjustment (see "Maintenance" section).

) Check inlet pressure and adjust pilot if necessary.

4) Be sure wire connections from thermopile are tight at gas valve terminals and at vent

safety snap switch.

5a) Either rocker switch or thermostat wires may be grounded. Remove wires from valve

terminals. If pilot stays lit, trace switch wiring for a ground. May be grounded to insert or

gas supply.

5b) Check open circuit millivolt output of thermopile. Reading should be greater than

325mV. Also check thermopile wire for kinks that can cause loss of mV. Replace faulty

thermopile if wire is okay and reading is less than 325mV.

6)Turn valve knob to “ON” and thermostat (if installed) to 90º. Millivolt meter should read

greater than 100 mV. If reading is OK and burner does not turn on, replace gas valve

(qualified service technician only).

Pilot burning, but no

flame on main burner with

valve knob “ON”, rocker

switch and thermostat

“ON”.

1) Pilot has gone out

) Rocker switch,

thermostat, or wires

defective

) Thermopile may not

be generating sufficient

millivolts

4) Plugged burner

orifice.

1) See Lighting Instructions.

) Disconnect rocker switch and thermostat wires at terminals 1 and 3 on valve. Jumper

across from 1 to 3 with pilot lit. If burner comes on either rocker switch, thermostat, or

wiring is not functioning. If not, jumper wires across switch wires at gas valve. If burner

comes on, wires are faulty or connections are bad.

) Check thermopile with millivolt meter (see Maintenance and Servicing), recheck

symptom #2.

4) Check burner for stoppage and remove.

Troubleshooting

NOTE: When troubleshooting the gas control system, be sure the external gas shut off valve, located at the gas sup-

ply inlet is in the “ON” position.

IMPORTANT: Call your gas supplier or plumber for additional help with any gas control problem. Valve system

troubleshooting should only be accomplished by a qualified service technician.

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