Hello,
I have a Colman furnace in my home. It is model number DGATo75BDE, 75000 BTU. The panel on the front said that the centrifugal switch is stuck closed . Due to this I can not get the hear to come. On. The A/C works and the fans work. Can you help me with what to do to resolve this problem? Than kyou in advance.

A c/s is usually mounted on the tail end of the draft inducer motor. Try giving the motor a few taps with a screwdriver handle. This may provide a quick, short-term remedy, but the problem will likely return.