23
LENNOX HEARTH PRODUCTS • MONTEBELLO
®
POWER VENT DV GAS FIREPLACES (LSM40/45EN-PV) • CARE AND OPERATION INSTRUCTIONS
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.
Power Vent Motor
Is Working?
Does The Pilot
Spark?
Pilot Burner
Lights?
Does Spark
Stop When Pilot
Lights?
Does Main Burner
Light?
System Runs
Continuously
Until Switched
Off?
START
On/Off Switch Or Wall Thermostat “On”?
Is There 120V Power To The Fireplace?
Are All Wiring Connections Tight?
(Turn Off Power Before Checking)
Yes
No
Yes
Is There 120V Power
To The Motor?
Replace Blower
Yes
Yes
Is The Pressure
Switch Closed?
No
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?
Replace Pressure
Switch
Replace Control
Module
Yes
Yes
Is The Lead To The
Spark Electrode
Attached Or Arcing
To Ground? Is The
Electrode Cracked?
No
Replace Ignition Module
Is Pilot Gas Line
Blocked? Is Pilot
Orifice Blocked?
No
Yes
Yes
Replace Pilot
Does Pilot Flame
Cover The Flame
Rod?
No
Yes
No
Is The Flame Rod Corroded?
Is The Pilot Hood Corroded?
Is Flame Rod Insulator Cracked?
Is Wire To Flame Rod Damaged?
Replace Ignition Module
Check Pilot For Obstruction.
Check Gas Pressure.
Adjust Pilot Flame.
No
Yes
Is There 1V Power
At Terminal 1 (MV)
During Spark Cycle?
No
Are Wires To Valve
Loose Or Corroded?
Yes
No
Is There Manifold Pressure?
Replace Gas Valve
No
Yes
Check Position Of
Pilot. Is Orifice
Blocked?
No
Replace Ignition Module
No
Does The Pilot Flame Cover The Flame Rod?
Is The Sensor Wire In Good Condition?
Is There Continuity To Ground From The Pilot Burner?
No
Replace Control Module
Does Pressure Switch Open During Operation?
Yes
No
Replace Ignition Module
Yes
Is Vent Partially Blocked?
Is There Water/Dirt In Hose To Pressure Switch?
Are Hose Connections Loose?
Is The Hose Cracked?
Replace Pressure Switch
No
Replace Control Module
No
Does System Run
Continue?
Replace Ignition
Module
No
Yes
WARNING: Never jump The Pressure
Switch Out Of This System. Property
Damage, Injury Or Death May Result.
No
Replace Ignition Module
