Last night we smelled something burning and realized it was the furnace. We looked and the air filer had fallen down and the fan stopped. It is still putting out heat, but the fan will not come on. Any ideas?
Im assuming you are running a/c and not heat...Was the filter burning?? if not and there are no other obvious burnt wires then id say you need a new motor. The filter, if it was'nt binding the blower wheel or wrapped arround the motor shaft would not have caused the prob.
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Its possible the motor is going bad,more likely the blower wheel assmebly needs to be cleaned.
Have a look at the blower motor assembly for dust and dirt on and around the blower motor and wheel.Clean it off with a damp rag and a vacum cleaner.
Check the area for any trash or loose stuff that could be causing this smell.
Usually when a motor goes bad it will run for a while then slow down,then stop on thermal overload.
There is a thermocouple "wire" that is supposed to be touching the pilot flame.
The thermocouple senses a flame (hot) and allows the heater to operate. If the thermocouple does not sense that the pilot is on, then it will not allow the furnace to operate.
Bend the thermocouple wire (or the pilot tube) so that the pilot flame is touchingg the thermocouple.
That shouls work now.
The air from the fan should not be blowing through the same cxavity that the pilot is in.
If it is, then you may have a leaking furnace whereby carbon monoxide may be seeping into your living quarters.
If the fix above works and the pilot stays on after the heater starts, then there is probably no leak.
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Check inside the door panel next to the wiring schematic, you should find the diagnostic codes. Look up 7 blinks. This should narrow down the problem. ( It sounds like a bad hot surface ignitor).
I had the same errror code on my coleman furnace (3 flashes combustion air switch failed to close) but at first didnt realize there was even a light that gave codes..Anyways long story short, after searching many forums one guy mentioned about the furnace giving a false reading and talked about improper air flow ( coming in and going out) which isnt triggering the switch correctly. After thinking about it and after getting the furnace to run correctly every time I took the door off to tap on the switch (and other spots not knowing what the problem was yet) I always put the door right back on then the furnace would do the same thing (stop running). so I pulled the door off again got the furnace to work properly and left the door off and tested it. It ran great, it started and stopped like normal for a hour and realized I might not be getting proper air flow. Then I remembered I asked my roommate to change my filters for me while I was gone (which he did) and looked at them while I still had the door off and realized the filters were in backwards! which resticted the air flow so much the switch wouldnt operate fully. so check your air filters, something so stupid almost cost me a house visit by the furnace guy....this may not be everyones problem but maybe I will help someone save a house visit....I still cant believe that was my problem and the furnace is still running great.