Question about Heating & Cooling
The fan on the furnace is not spinning, when the furnace comes on it hums. The pilot lights and flames come up but it's not heating the house like it should.
Check the fan capacitor first. its a little silver flat battery looking thing near the motor. be sure to kill power. test mf value stamped on the side with a meter, or take to a motor shop and test. if its good the motor is bad. . pull whole blower assembly and change the motor or take to motor shop and let them change. label all wires and where they go and the color. it will be tough if you don't know motors and all but generally white is to white and is common or neutral. black is high speed for ac . red is low speed for heat. brown and brown with stripe go to capacitor. blue and yellow are med and med hi speeds and taped off or put on vacant terminals. be sure to clean wheel when you have it out. good luck. you can't make to many notes , mark stuff with a sharpie pen as you dissassemble. note rotation of wheel, location of screws, clearances of wheel on each side check rotation of wheel on completion, cups into the wind. <------ )
Posted on Nov 21, 2008
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Posted on Jan 02, 2017
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On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.
What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).
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