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Soleus Air PE3-12R-03 Furnace Door Switch

The furnace door switch is a safety switch which inhibits initial fan and gas ignition from activating so as to stop a potential explosion. You should really have it changed ASAP especially if you think it is defective.

How do you know when your safety door switch is on its last leg?

Check eBay to see if your furnace door switch is in stock!
If you decide on picking up or purchasing do your best and cross-check the model number and also make a visual inspection in order to be sure the proper replacement furnace door switch is the one being purchased. There is no need to replace the part all by yourself. Hire someone with experience in your town or city to replace the part.
Feel free to download your manual for help.
Check eBay for your furnace door switch!