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International Comfort Products HAC436AKA1 Furnace Door Switch
The furnace door switch prevents the draft inducer and ignitor being triggered to start so as to stop a potential explosion. You must have the device traded for new one as quick as you can if it is causing you problems.
Known indicators the your switch on the furnace door is almost dead?
- The switch looks damaged
- The whole system will not start whether the door is open or closed
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