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Lennox G40UH-36A-045 Furnace Door Switch
A furnace door switch is a safety feature that stops the blower and other risky devices being triggered to start so as to stop a potential explosion. Do not waste time and have it switched out as soon as possible if it is defective.
Red flags your furnace door switch has little life left
- The safety door switch appears to be broken badly
- The system does not turn on whether the door is off or on
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