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 TROUBLESHOOTING THE UNIT:
1.Check whether there is power to the unit (fireplace).
2.Check whether there is gas to the unit (fireplace).
3.The igniter module in the fireplace is equipped with a lockout device that will put the unit into a lockout condition. Follow the steps in the chart below to reset the control: Turn the Wall Receiver Switch to the OFF position, or turn the Remote Control Transmitter OFF.
4.If this is the first time the unit has been fired, check the unit wiring against the wiring diagram before performing any troubleshooting.
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Power Vent Motor | No |
| Wall Receiver Switch “On”? Is There | Yes |
| Is There 120V Power | Yes |
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| Replace Blower |
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Is Working? |
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| 120V Power To The Fireplace? Are All |
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| To The Motor? |
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| Wiring Connections Tight? (Turn Off |
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| Yes |
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| No |
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| Power Before Checking) |
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| Replace Control Module | ||||||
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| No |
| Is The Pressure | No |
Does The Pilot |
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| Switch Closed? |
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Spark? | Yes | Is The Lead To The | Yes |
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| Spark Electrode |
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Yes |
| Attached Or Arcing | Replace Control |
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| To Ground? Is The |
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| Module |
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| Electrode Cracked? |
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Is There Blockage In The Vent? | No |
| Replace Pressure |
Is There Water/Dirt In The Hose From |
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The Blower To The Pressure Switch? |
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Are the Hose Connections Loose? |
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Is The Hose Cracked? |
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Pilot Burner
Lights?
Yes
No
No
Is Pilot Gas Line
Blocked? Is Pilot
Orifice Blocked?
No
Replace Ignition Module
Yes | Replace Pilot |
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Replace Ignition Module
WARNING: RISK OF SERIOUS PERSONAL INJURY, DEATH, OR PROPERTY DAMAGE.
Never jump the pressure switch out of this system.
Does Spark
Stop When Pilot
Lights?
Yes
No |
| Does Pilot Flame | Yes | |
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| Cover The Flame |
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| Rod? |
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| No | |
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Check Pilot For Obstruction.
Check Gas Pressure.
Adjust Pilot Flame.
Is The Flame Rod Corroded? Is The Pilot Hood Corroded?
Is Flame Rod Insulator Cracked? Is Wire To Flame Rod Damaged?
No 
Replace Ignition Module
Does Main Burner | No | Is There 1V Power | Yes |
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| Are Wires To Valve |
| No |
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| Yes |
| Check Position Of | ||||
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| Is There Manifold Pressure? | |||||||||||||||||
Light? |
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| At Terminal 1 (MV) |
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| Loose Or Corroded? |
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| Pilot. Is Orifice | ||||||
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| During Spark Cycle? |
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| No |
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| Blocked? | ||
| Yes |
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| No | Replace Ignition Module |
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| Replace Gas Valve |
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System Runs
Continuously
Until Switched
Off?
No
Is The Correct Size Of Orifice Restrictor Installed In The Power Vent? Does The Pilot Flame Cover The Flame Rod?
Is The Sensor Wire In Good Condition?
Is There Continuity To Ground From The Pilot Burner?
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| Yes |
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| Yes |
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| Does Pressure Switch Open During Operation? | ||||||||
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| No | ||||
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| No |
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Replace Pressure Switch
No
Is Vent Partially Blocked?
Is There Water/Dirt In Hose To Pressure Switch?
Are Hose Connections Loose?
Is The Hose Cracked?
24
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| Does System Run | No | Replace Ignition | |
Replace Ignition Module |
| Replace Control Module | ||||||
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| Continue? |
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| Module | ||
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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
