The inducer fan came apart last Saturday, couldn't figure out what was wrong so had to call a service tech, no air coming out of the exhaust, removed the fan and replaced it Monday. Restarted the furnace and it fired up and ran for 5 minutes, then the hsi fell off the screw, had to remove gas valve, and the tube the hsi is attached to replace it. The wires at the hsi had some insulation that had fell off(exposed wire). Replaced hsi and went to restart the furnace, everything worked except the gas valve didn't open and the hsi went cold. Gave up after 5 tries. Had another tech come check, he checked amperage going to the gas valve and it was at 4.5 amps, said valve is stuck and had to order one, won't be here until Thursday, being Christmas and all. Since the valve is being replaced, I removed it and took it apart, the valve was not stuck. It fell out of the valve body. Could a dead coil cause high amperage with no movement? The furnace is a 1988 model, I know it needs replaced, had a few other money draining things hit at once and would rather not get on a payment if possible. I'm having a hard time thinking the inducer fan and gas valve died at the same time. Thanks in advance.

My carrier gas furnace had recently developed a nasty vibration and loud humming sound when the inducer motor comes on. does anyone know what may be causing this? any tips towards a remedy that doesnt include a costly technician would be greatly appreciated!