Troubleshooting - Lennox Hearth Products Vintage VIN Installation And Operation Manual

TROUBLESHOOTING

NOTE: When troubleshooting the gas control system, be sure the external gas shut off valve, located at the gas supply 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.
SYMPTOM PROBABLE CAUSE
Thin black coating Improper log or ember
(soot) forms on the placement.
viewing glass, logs, or
firebox. Blocked flue.
Improper air shutter
setting.
Humming or whistling Normal operating noise.
coming from fireplace.
Dirt in burner orifice.
A change in flame A change in gas pres-
appearance or burner sure.
operation.
Improper ember or log
placement.
Pilot will not light. No gas supplied to unit.
Air in line.
Defective igniter (no
spark at electrode).
The valve control knob
is not turned to "pilot"
and pushed in.
Pilot will not stay lit Pilot flame is not sur-
after carefully following rounding thermocouple.
lighting instructions.
Thermocouple not
generating sufficient
voltage.
Air in gas supply line.
Main burner will not Pilot has gone out.
burn.
Rocker switch or
thermostat wires are
defective.
Thermopile may not be
generating sufficient
millivolts.
See Log Set and Ember Installation.
Check for obstructions in vent pipe, check for proper restrictor setting. See Flue Restric-
tors.
See Air Shutter Adjustment.
See Quiet Operation. The noise may be reduced by slightly turning the flame down. Turning
the flame down will reduce the heat output of the fireplace.
Clean orifice.
Have your gas supplier check for correct gas pressure (7" W.C. natural gas; 11" W.C. LP
gas).
See Log Set and Ember Installation.
Turn on gas.
To purge, hold in control knob in pilot position for 1-2 minutes and light.
Check for spark at electrode and pilot, if no spark and electrode wire is properly connected,
replace igniter.
See Lighting Instructions.
Check pilot flame adjustment (see Maintenance and Servicing section).
Check the connection between the thermocouple lead and the valve. Turn control knob to
"pilot" and push in and light pilot. While lit, take millivolt reading at lead going into valve's
CPU. Minimum reading should be 17 millivolts. If less, replace thermocouple.
Purge air in pilot gas line by holding in control knob at "pilot" and sparking igniter. The air
in the line may take up to several minutes to purge.
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 or thermostat wir-
ing is not functioning.
Make sure thermopile is fully engulfed by the pilot flame. Check thermopile with millivolt
meter. With pilot lit and the rocker switch and thermostat off, the millivolt reading with the
meter connected to valve terminals 1 and 2 should be after 2 minutes at least 325. If the
thermopile lead connections are good at terminals 1 and 2 and readings are less than 325,
replace faulty thermopile.
CORRECTIVE ACTION
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