Troubleshooting Guide Power Vent System - Lennox MDLX40IN-PV Care And Operation Instructions Manual

LENNOX HEARTH PRODUCTS • MONTEBELLO
TROUBLESHOOTING GUIDE
Power Vent System
NOTE: Service must be performed by a qualified installer, service agency, or your gas supplier.
BEFORE TROUBLESHOOTING THE UNIT:
1. Confirm there is power to the unit (fireplace).
2. Confirm there is gas to the unit (fireplace).
3. The igniter module in the fireplace is equipped with a device that can put the unit into a lockout state. Follow the steps in the chart below to reset the
control: Turn the ON/REMOTE/OFF switch to the OFF position, or turn the remote 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
Switch Open
Power Vent Motor No
When Unit Is
Is Working?
Turned OFF?
Yes
No
Does the Pilot
Spark?
Yes
Yes
Electrode Cracked?
Pilot Burner
No
Lights?
Yes
No
Does Spark
Does Pilot Flame
Stop When Pilot
Lights?
Yes
Check Pilot for Obstruction.
Check Gas Pressure.
Adjust Pilot Flame.
Does Main Burner No Are Wires to Valve
Light? Loose Or Corroded?
Yes
System Runs
No
Continuously
Until
Switched OFF?
DLX POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • CARE AND OPERATION INSTRUCTIONS
®
Is Presure
Yes
Replace Pressure
Switch (Ensure
No
Power Vent Motor
Is NOT Running)
Is the Pressure
Switch Closed?
Is the Lead to the
Spark Electrode
Attached or Arcing
Replace Control
to Ground? Is the
Module
No
Replace Ignition Module
Is Pilot Gas Line
Yes
Replace Pilot
Blocked? Is Pilot
Orifice Blocked?
No
Replace Ignition Module
Yes Is the Flame Rod Corroded?
Cover the Flame Is the Pilot Hood Corroded?
Rod? Is Flame Rod Insulator Cracked?
Is Wire to Flame Rod Damaged?
No
No
Is There Manifold Pressure?
Does the Pilot Flame Cover the Flame Rod?
Is the Sensor Wire in Good Condition?
Is There Continuity to Ground from the Pilot Burner?
Yes
Does Pressure Switch Open During Operation?
No
Replace Ignition Module
ON/OFF Switch or Remote
ON? Is There 120 V Power
to the Fireplace? Are All Yes
Wiring Connections Tight?
(Turn OFF Power Before
Checking)
No Is There Blockage in the Vent?
Is There Water/Dirt in the Hose from
the Blower to the Pressure Switch?
Yes
Are the Hose Connections Loose?
Is the Hose Cracked?
No
Yes
No
Replace Gas Valve
Yes
Replace Control Module
Is There 120V Power Yes
to the Motor?
No
Replace Control Module
No
WARNING: Never Jump The Pressure
Switch Out Of This System. Property
Damage, Injury Or Death May Result.
Unit Will Not Start If Pressure Switch
Is Jumped.
Replace Ignition Module
Check Position of
Pilot. Is Orifice
Blocked?
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?
No
Does System Run No
Continue?
Replace Blower
Replace Pressure
Switch
Replace Ignition
Module
25