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Tripp Lite SRCOOL12K Furnace Door Switch

The furnace door switch stops the vent fan and gas ignition being triggered to start so as to avoid injuries. You should really have it exchanged for a new one swiftly if it is causing you problems.

Key indicators that my safety switch on the furnace door is crapping out?

Check eBay to see if your furnace door switch is in stock!
If you decide on picking up or purchasing, do your due diligence and cross-check the correct model as well as make a visual comparison in order to be sure the right furnace door switch is the one being purchased. You do not have to install it yourself. Locate a pro locally to do it for you.
Feel free to download your manual for help.
Check eBay for your furnace door switch!