[Tyrannosaurus]

hello,

Long story short my centrail air leaked water into the furnace and now this piece sparks and my fan won't even come on. I'm just trying to look up parts pricing and potentially order it

 

[joed]

Looks like an interlock switch to prevent the unit from starting with the door open.
Something like this. You just need the proper specs to get the correct one.

You could jump the two wires together to get the unit running temporarily.

 

[surferdude2]

Could be anything... fan relay maybe. Clean it up and see if there is a part number. Else, the make and model of the furnace could help.

From what I can read, it looks like a SPDT switch so that's a start... it's HP rated so suitable for motor control. Could be a fan relay.

A picture of another profile of it might also help.

Edit.... Blowing it up changed my mind... I agree, it looks like a door switch since I see the flippers on the side that hold it in the slot. Good eye @joed