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I could not get the cover off the relay without amaging the board. So I switched controller units. Still no preheat/inducer action.

Will do. And once again- thank you for your time- I really appreciate all the info!

Will I be risking any damage to the control unit of unit two if I use it on Furnace one?

Thank you for the great pictures. I gave the relay some good taps- no luck, could the pressure switch be the culprit?

Hello-
Furnace number one.:
I have power to the board. I jumped between R and W with no results. I would like to put a meter on the Inducer, but it's power connector slides directly onto a small...

Thank you for your response. Everything checks out on your list up to the fuse. I will check voltage the voltage. Is there a chance it could be the ignitor?

Furnace 2: I was referring to the...

Hello- I have two Carrier WeatherMakers (58SX)

Furnace number one: Inducer motor won't start

Furnace number two:
Just started acting up today. Last year we had a service company replace just...