We have a 17 year old Williamson natural gas furnace that once again is not wanting to work. Every year we have to have a service man come for one problem or the other. However, now that service company is no longer in buisness and I was hoping someone here could help. We have replaced the motor at least 3 times, last year was the last time. The furnace , an electronic ignition, requires no active pilot light. The motor in the past seems to not be able to turn. When I attempt to turn the belt and fan below the motor, they will not turn. The house is over 100 years old and is a partial cut stone basement that is generally wet/damp all year. Anyone have any ideas as to the cause of this or how to fix the problem. The furnace will fire , start burning gas, but when it comes time for the fan motor to come on it shuts off. Any ideas or help appreciated. Thanks