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Lennox G40UH-48B-090 Furnace Door Switch
The furnace door switch prevents initial fan and ignitor from starting so as to stop a potential explosion. Do not waste time and have it swapped out quickly especially if you think it is defective.
Subtle cues of a poorly working furnace door switch
- The safety door switch is removed
- The whole system does not function even with the door closed
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Before you decide on buying or purchasing any Lennox G40UH-48B-090 part, do your due diligence and cross-check the model number and also make a visual comparison so that you are positive that the proper replacement furnace door switch is the one being purchased. There is no rule that says you have to replace the part all by yourself. Search for a pro in your community to do the job for you.
Feel free to download your manual for help.
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