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LENNOX HEARTH PRODUCTS • MONTEBELLO
®
DV GAS FIREPLACES (LSM40/45MN-2, LSM40/45MP-2, LSM40/45EN-2) • CARE AND OPERATION INSTRUCTIONS
SYMPTOM POSSIBLE CAUSES CORRECTIVE ACTION
1. Nothing happens when ON/OFF switch is
turned on (pilot does not spark).
A. Low voltage/or bad lead wires. Check voltage on AC terminals of module. The value
should be around 24 VAC. Confirm that wire con-
nections are secure.
B. Damaged igniter wire. Check for visible cracked casing, cuts, etc.
C. Damaged pilot assembly. Check pilot assembly for visibly broken spark elec-
trode, etc.
D. Batteries Low Check voltage on D.C. terminal of batteries in remote
control. The value should be around 3.0V
2. The main burner does not light and the
igniter is sparking.
A. No fuel supply. Ensure that the gas supply is turned on.
B. Loose sensor wire. Ensure sensor wire connection is secure to purple
wire of ignition control.
C. Loose wires to valve. Ensure blue and white (2) wires connection is secure
to valve.
D. Air in the gas line. Purge gas line of air.
E. Low voltage. Test voltage at AC terminals of module for 24 VAC.
If no voltage, replace module.
Check electrical connections between module and gas
control. If okay, replace gas control (valve).
3. The main burner come "ON" but then go
"OFF".
A. Gas supply is turned "OFF". Turned gas supply to "ON".
B. Loose wire connection on valve or
ignition module.
Check wire connection.
C. Flame does not engulf flame sensor. Check location of sensor.
D. Obstructed vent system. Check vent system for obstructions.
4. The log and glass soot. A. Flame impingement on the log. Check for proper log placement.
B. Improper air shutter opening. Check for proper air shutter openings.
TROUBLESHOOTING GUIDE - ELECTRONIC GAS CONTROL SYSTEM
Note: Before troubleshooting the gas control system, make sure the external gas shut off valve, located at gas supply inlet, (and wall switch, if
applicable), is in the “ON” position.
Important: Valve system troubleshooting should only be accomplished by a qualified service technician.