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International Comfort Products PH5560AKA2 Furnace Door Switch
The job of the furnace door switch prevents initial fan and other risky devices from starting so as to stop a potential explosion. Do not try to fix it, just have it replaced as soon as you can if it is causing you problems.
Symptoms of a weak furnace door switch
- The switch looks like it is worn down
- The whole system will not engage whether the door is open or closed
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