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Lennox Furnace Flame Sensor Replacement #69W43

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This video provides step-by-step repair instructions for replacing the flame sensor on a Lennox furnace. The most common reasons for replacing the flame sensor are when the furnace doesn’t heat or runs only for a few minutes.

All of the information in this flame sensor replacement video is applicable to the following brands: Lennox

Tools needed: 1/4 inch socket

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Step By Step Instructions

1
Before you replace the flame sensor in your furnace first turn off the power to the furnace.
2
Unthread the retaining knobs securing the upper access panel and remove the panel.
3
Detach the flame sensor wire.
4
Now use a quarter inch socket or nut driver to unthread the mounting screw securing the sensor.
5
Slide out the old sensor.
6
Install the new flame sensor by carefully inserting it into the burner housing.
7
Thread and tighten the mounting screw to secure.
8
Connect the wire.
9
Replace the upper access panel by aligning the top edge first then thread the retaining knobs to secure.
10
With the repair completed turn the power back on and your furnace should be ready for use.
Description
This video provides step-by-step repair instructions for replacing the flame sensor on a Lennox furnace. The most common reasons for replacing the flame sensor are when the furnace doesn’t heat or runs only for a few minutes.

All of the information in this flame sensor replacement video is applicable to the following brands: Lennox

Tools needed: 1/4 inch socket

Connect With Us!
Step-By-Step Instructions
1
Before you replace the flame sensor in your furnace first turn off the power to the furnace.
2
Unthread the retaining knobs securing the upper access panel and remove the panel.
3
Detach the flame sensor wire.
4
Now use a quarter inch socket or nut driver to unthread the mounting screw securing the sensor.
5
Slide out the old sensor.
6
Install the new flame sensor by carefully inserting it into the burner housing.
7
Thread and tighten the mounting screw to secure.
8
Connect the wire.
9
Replace the upper access panel by aligning the top edge first then thread the retaining knobs to secure.
10
With the repair completed turn the power back on and your furnace should be ready for use.

Applicable Product Model

Parts Needed
Total$0.00

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