24
LENNOX HEARTH PRODUCTS • MERIT PLUS
®
DIRECT VENT GAS FIREPLACES (MPDP35/40) • CARE AND OPERATION INSTRUCTIONS
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
POSSIBLE CAUSES
CORRECTIVE ACTION
1.
Nothing happens when the fireplace is
turned On/Off.
A.
Remote is not functioning properly.
•
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.
B.
Gas is not reaching the fireplace.
Check the gas supply and gas shutoff valves.
C.
Unit is not receiving power.
•
Check/replace back-up batteries behind the
wall plate.
•
Check building circuit breakers to ensure power
is on to the fireplace.
2.
The main burner does not light and the
igniter is sparking.
A.
Gas is not reaching the fireplace.
Check the gas supply and gas shutoff valves.
B.
Loose wires to the valve.
Check control compartment for any obvious
loose wiring (call a service technician if required).
C.
Loose wires to ignition module.
Check control compartment for any obvious
loose wiring (call a service technician if required).
D.
Air in the gas line.
Purge gas line of air (call a service technician
if required).
3.
The main Burner comes on but then goes
out.
A.
Gas is not reaching the fireplace.
Check the gas supply and gas shutoff valves.
B.
Loose wires to the valve or ignition mod-
ule.
Check control compartment for any obvious
loose wiring (call a service technician if required).
C.
Pilot flame is not engulfing the sensor.
Call for a service technician.
D.
Obstructed vent system.
Call for a service technician.
4.
Soot is present on the logs and glass.
A.
Excessive flame impingement on the logs. Check for proper log placement.
B.
Improper air shutter opening.
Open the air shutter by pulling on the air shutter
adjustment lever.
