I have a 1989 carrier furnace with problems

[HayZee518]

why do you call it a "pilot switch?" It isn't a switch! For a man with all that time in the field you should know proper terminology. A flame detector, a millivolt generator. Don't throw terms out there that a diy don't understand.

[SeattlePioneer]

Well, the SPDT switch in the Carrier pilot switch is one of it's major functions, as described by HVACWiz in an earlier post.

and there is no millivolt generator or thermocouple in it.

It sounds like this is a part and ignition system with which you aren't familiar.

[HayZee518]

I apologize there is a thing called a pilot switch - I checked the carrier distributorship.

[SeattlePioneer]

No problem Hay. It's an ignition system unique to a good many Carrier/Bryant/Payne/Day and Night brand furnaces roughly in the 1980s or so.

This ignition system replaced standing pilot lights and it was in turn replaced by the current hot surface ignition system.