Our furnace is not working, to be honest we are pretty low on income right now and are trying to fix it ourselves... so any help would be greatly appreciated. Heres what we know or think we know. (My father added a few things that may be necessary or unnecessary, please forgive me if the information is not correct)
Rheem Imperial 80 Plus Furnace
The furnace has been set up to run the fan constantly at low speed, circulates the air in the house all the time. When the heat/cooling is active a separate exhaust fan in the exhaust pipe will come on and clean out any gas in the pipe, then the furnace fan will increase speed to move the air around the house, then again the exhaust fan will do its thing and the furnace fan will fall back to low speed ending the cycle.
Furnace was not working in air conditioning mode then stopped working. We did not notice when this happened, only discovered it when it got hot and tried to put the air conditioning on.
The furnace motor continued to run, tried to switch to heat with the same results, no heat but the fan continued to run.
There is a fan motor run capacitor (10 microfarad 370 volts plus-minus 5%) that starts the motor and I thought it might also control the fan speed changes when the heat/cooling actually came on. I replaced the capacitor with a 10 microfarad 440 volts plus-minus 5% (should be ok as a replacement?) but it made no difference at all.
TDLR Fan still runs but heat/cool wont work! Help!