Spade terminals

The spade terminals on the wires connecting to the proof of fire sensor are charred and look slightly melted. I’ve ordered and new one of those and a new vacuum switch because it ignites and runs for a minute but then stops. but my question is can I replace the spade terminal ends on the wire? It’s a castle serenity pellet stove.

The POF wire could be charred if one of the wires had lost some insulation and maybe shorted to the metal of the stove, but you should plug the stove into a good surge protector which can prevent any surges that may also cause that. I only recommend the Tripp-Lite brand because I know they work.
Here is a link to order your new Proof of Fire pigtail wire:
https://www.eastcoasthearth.com/search?q=Proof+of+fire+pigtail