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LENNOX HEARTH PRODUCTS • MONTEBELLO
TROUBLESHOOTING GUIDE: POWER VENT SYSTEM
Important: Service must be performed by a qualified installer, service agency or your gas supplier.
BEFORE COMMENCING TO TROUBLESHOOT THE UNIT:
1. Check if there is power to the unit (fireplace).
2. Check if there is gas to the unit (fireplace).
3. The igniter module in the fireplace is equipped with a lockout device, which will put the unit into a lockout condition. Follow the steps in the
chart below to reset the control: Turn the On/Off switch to the Off position, or turn the thermostat to the Off position.
4. If this is the first time that the unit has been fired, check the wiring of the unit against the wiring diagram before commencing troubleshooting.
START
Power Vent Motor
No
On/Off Switch Or Wall Thermostat "On"?
Is Working?
Is There 120V Power To The Fireplace?
Are All Wiring Connections Tight?
Yes
(Turn Off Power Before Checking)
No
Does The Pilot
Spark?
Yes
Is The Lead To The
Spark Electrode
Attached Or Arcing
Yes
To Ground? Is The
Electrode Cracked?
Pilot Burner
Is Pilot Gas Line
No
Lights?
Blocked? Is Pilot
Orifice Blocked?
Yes
No
Does Spark
Does Pilot Flame
Stop When Pilot
Cover The Flame
Lights?
Yes
Check Pilot For Obstruction.
Check Gas Pressure.
Adjust Pilot Flame.
Does Main Burner
No
Is There 1V Power
Light?
At Terminal 1 (MV)
During Spark Cycle?
Yes
System Runs
No
Does The Pilot Flame Cover The Flame Rod?
Continuously
Is The Sensor Wire In Good Condition?
Until Switched
Is There Continuity To Ground From The Pilot Burner?
Off?
POWER VENT DV GAS FIREPLACES (LSM40/45EN-PV) • CARE AND OPERATION INSTRUCTIONS
®
Is The Pressure
Switch Closed?
Yes
Replace Control
Module
No
Replace Ignition Module
Yes
Replace Pilot
No
Replace Ignition Module
Yes
Is The Flame Rod Corroded?
Is The Pilot Hood Corroded?
Rod?
Is Flame Rod Insulator Cracked?
Is Wire To Flame Rod Damaged?
No
Yes
Are Wires To Valve
Loose Or Corroded?
No
Replace Ignition Module
Yes
Does Pressure Switch Open During Operation?
No
Replace Ignition Module
Replace Control Module
Yes
Is There 120V Power
Yes
To The Motor?
No
No
Is There Blockage In The Vent?
Is There Water/Dirt In The Hose From
The Blower To The Pressure Switch?
Are the Hose Connections Loose?
Is The Hose Cracked?
WARNING: Never jump The Pressure
Switch Out Of This System. Property
Damage, Injury Or Death May Result.
No
Replace Ignition Module
No
Is There Manifold Pressure?
No
Replace Gas Valve
Is Vent Partially Blocked?
Is There Water/Dirt In Hose To Pressure Switch?
Are Hose Connections Loose?
Yes
Is The Hose Cracked?
No
Does System Run
Replace Blower
Replace Control Module
No
Replace Pressure
Yes
Check Position Of
Pilot. Is Orifice
Blocked?
Replace Pressure Switch
No
No
Replace Ignition
Continue?
Module
Switch
23
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Table of Contents
Troubleshooting
