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LENNOX HEARTH PRODUCTS • MERIT PLUS
®
DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • CARE AND OPERATION INSTRUCTIONS
SYMPTOM POSSIBLE CAUSES CORRECTIVE ACTION
1. Nothing happens
when the fi replace is
turned ON/OFF.
A. Remote control system is
not functioning properly.
To use the remote control system, the wall switch plate must be set to REMOTE.
Manually operate the fi replace using the wall switch (ON/OFF).
Replace the batteries in the handheld remote and/or behind the wall switchplate.
B. Unit is not receiving power.
Check/replace batteries behind the wall switchplate.
Replace unit battery backup.
Check building circuit breakers to ensure power is on to the fi replace.
C. Gas is not reaching the
fi replace.
Check the gas supply and gas shutoff valves (call a service technician, if required).*
2. The main burner
does not light
and the igniter is
sparking.
A. Gas is not reaching the
fi replace.
Check the gas supply and gas shutoff valves (call a service technician, if required).*
B. Unit is not receiving power.
Replace unit battery backup.
C. Loose wires to the valve.
Check control compartment for any obvious loose wiring (call a service technician).
D. Loose wires to ignition
module.
Check control compartment for any obvious loose wiring (call a service technician).
E. Air in the gas line.
Purge gas line of air (call a service technician).
3. The burner lights,
then immediately
goes out.
A. Gas is not reaching the
fi replace.
Check the gas supply and gas shutoff valves (call a service technician, if required).*
B. Loose wires to the valve
or ignition module.
Check the gas supply and gas shutoff valves (call a service technician, if required).*
C. Pilot fl ame is not engulfi ng
the sensor.
Call a service technician.
D. Obstructed vent system.
Call a service technician.
4. Soot is present on
the glass and panels.
A. Initial fi replace operation.
A white fi lm may develop on the glass during the fi rst few fi res as part of the burn-in
process.
The fi rst few times you use the fi replace, clean the glass after each use (AFTER
THE GLASS HAS COMPLETELY COOLED); otherwise, the white fi lm will bake onto
the glass and become diffi cult to remove.
See glass cleaning instructions in the MAINTENANCE section of this manual.
B. Excessive fl ame
impingement on panels
and fi replace ceiling.
Properly position the media as detailed in the instructions provided with the Media Kit.
C. Improper air shutter
opening.
Open the air shutter by adjusting the air shutter adjustment lever according to the
instructions in this manual.
D. Improper vent restrictor
setting.
Open the air shutter by adjusting the air shutter adjustment lever according to the
instructions in this manual.
5. Poor fl ame and/or
blue fl ame.
Door seal is not properly
aligned, causing gaps and
air leaks.
Remove and realign the door so the gasket seal is fully engaged around the door
frame.
*The unit may have multiple gas supply shutoffs (the main gas supply valve in the house, the gas supply valve in the fi replace control
compartment, and/or an additional shutoff valve near the fi replace).
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) is in the
“ON” position.
Note: Valve system troubleshooting should only be performed by a qualifi ed service technician.
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