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Lennox Furnace Gas Valve Replacement #73W17

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This video provides step-by-step instructions for replacing the gas valve assembly on Lennox furnaces. The most common reason for replacing the gas valve assembly is if the gas valve does not open, making the furnace unable to heat the house.

All of the information in this gas valve replacement video is applicable to the following brands: Lennox

Tools needed: 1/4 inch socket, pipe wrenches

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Step By Step Instructions

1
Before you replace the gas valve in your furnace first turn off the power to the furnace
2
Shut off the gas supply.
3
Unthread the retaining knobs securing the upper access panel and remove the panel.
4
Now use pipe wrenches to separate the gas supply pipe union.
5
Unthread the gas inlet pipe from the gas valve.
6
Disconnect the wires attached to the valve.
7
Disconnect the grounding wire as well.
8
Cut the zip tie securing the wires.
9
Use a quarter-inch socket or nut driver to remove the screws securing the gas manifold and valve to the burner housing.
10
Remove the assembly.
11
Note the orientation of the valve on the manifold then unthread the old valve.
12
Before you install the new gas valve remove the inlet and outlet plugs.
13
Apply some sealant to the threads of the manifold then thread the manifold into the outlet port of the new valve.
14
Make sure the new valve is orientated the same way as the old valve.
15
Reposition the manifold by aligning the orifices with the burner tubes.
16
Replace the screws to secure.
17
Reconnect the grounding wire.
18
Connect the wires to the appropriate terminals on the new valve.
19
Secure the wires with a zip tie.
20
Confirm that the gas valve switch is in the “on” position.
21
Apply sealant to the threads of the gas valve pipe then thread the pipe into the new gas valve assembly.
22
Realign the gas pipes and secure the union.
23
Turn the gas supply back on.
24
To verify there are no gas leaks apply a dish soap and water solution to the pipe connections
25
Once confirmed, replace the upper access panel by aligning the top edge first then thread the retaining knobs to secure.
26
Turn the power back on and your furnace should be ready for use.
Description
This video provides step-by-step instructions for replacing the gas valve assembly on Lennox furnaces. The most common reason for replacing the gas valve assembly is if the gas valve does not open, making the furnace unable to heat the house.

All of the information in this gas valve replacement video is applicable to the following brands: Lennox

Tools needed: 1/4 inch socket, pipe wrenches

Connect With Us!
Step-By-Step Instructions
1
Before you replace the gas valve in your furnace first turn off the power to the furnace
2
Shut off the gas supply.
3
Unthread the retaining knobs securing the upper access panel and remove the panel.
4
Now use pipe wrenches to separate the gas supply pipe union.
5
Unthread the gas inlet pipe from the gas valve.
6
Disconnect the wires attached to the valve.
7
Disconnect the grounding wire as well.
8
Cut the zip tie securing the wires.
9
Use a quarter-inch socket or nut driver to remove the screws securing the gas manifold and valve to the burner housing.
10
Remove the assembly.
11
Note the orientation of the valve on the manifold then unthread the old valve.
12
Before you install the new gas valve remove the inlet and outlet plugs.
13
Apply some sealant to the threads of the manifold then thread the manifold into the outlet port of the new valve.
14
Make sure the new valve is orientated the same way as the old valve.
15
Reposition the manifold by aligning the orifices with the burner tubes.
16
Replace the screws to secure.
17
Reconnect the grounding wire.
18
Connect the wires to the appropriate terminals on the new valve.
19
Secure the wires with a zip tie.
20
Confirm that the gas valve switch is in the “on” position.
21
Apply sealant to the threads of the gas valve pipe then thread the pipe into the new gas valve assembly.
22
Realign the gas pipes and secure the union.
23
Turn the gas supply back on.
24
To verify there are no gas leaks apply a dish soap and water solution to the pipe connections
25
Once confirmed, replace the upper access panel by aligning the top edge first then thread the retaining knobs to secure.
26
Turn the power back on and your furnace should be ready for use.

Applicable Product Model

Parts Needed
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