Troubleshooting Guide - Electronic Gas Control System - Lennox MPDP35IN Care And Operation Instructions Manual

LENNOX HEARTH PRODUCTS • MERIT PLUS
TROUBLESHOOTING GUIDE
Note: Before troubleshooting, be sure that the appliance main line gas shut-off valve and the wall switch are in the "ON"
position. The following troubleshoots the fireplace only to an elementary level. For detailed Remote and Ignition System
troubleshooting, refer to the instructions provided with the remote.
Important: Detailed valve system troubleshooting should only be accomplished by a qualified service technician.
SYMPTOM
1. Nothing happens when the fireplace is
turned On/Off.
2. The main burner does not light and the
igniter is sparking.
3. The main Burner comes on but then goes
out.
4. Soot is present on the logs and glass.
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DIRECT VENT GAS FIREPLACES (MPDP35/40) • CARE AND OPERATION INSTRUCTIONS
®
POSSIBLE CAUSES
A. Remote is not functioning properly.
B. Gas is not reaching the fireplace.
C. Unit is not receiving power.
A. Gas is not reaching the fireplace.
B. Loose wires to the valve.
C. Loose wires to ignition module.
D. Air in the gas line.
A. Gas is not reaching the fireplace.
B. Loose wires to the valve or ignition mod-
ule.
C. Pilot flame is not engulfing the sensor.
D. Obstructed vent system.
A. Excessive flame impingement on the logs.
B. Improper air shutter opening.
CORRECTIVE ACTION
• Check that the wall switch plate is set to remote
(if remote was used).
• Operate the fireplace from the wall plate switch.
• Replace remote and/or receiver batteries.
Check the gas supply and gas shutoff valves.
• Check/replace back-up batteries behind the
wall plate.
• Check building circuit breakers to ensure power
is on to the fireplace.
Check the gas supply and gas shutoff valves.
Check control compartment for any obvious
loose wiring (call a service technician if required).
Check control compartment for any obvious
loose wiring (call a service technician if required).
Purge gas line of air (call a service technician
if required).
Check the gas supply and gas shutoff valves.
Check control compartment for any obvious
loose wiring (call a service technician if required).
Call for a service technician.
Call for a service technician.
Check for proper log placement.
Open the air shutter by pulling on the air shutter
adjustment lever.