Question about Heating & Cooling
Hi, I am surprised you have no error code on this furnace. Anyway, the sequence of operation, order of parts to start would be when you get a call for heating the first thing that will start is the small inducer or combustion vent motor. When you say humming, I think of the motor bearings out and the motor just sets there and hums. Before it will do anything, this motor must run to build pressure and vent old gasses, and to pressurize the box and close the pressure switch. When the pressure switch closes the board knows the motor is on and will start the firing sequence, pilot will glow or ignite and flame sensor will send signal to board or module to open main gas valve. Then after a delay, the large indoor blower will come on. Check this inducer motor to see if it is just stuck. It has a small fan in it you should be able to see and if the motor hasn't burned out you may be able to turn the blade with something to see if you can get it to spin. Do this with the unit off. If the motor just hums, it will have to be replaced. Remove it and take it to a heating parts house or appliance store and see if you can locate one. I am sure by the humming you are saying, the motor is stuck.Its the first thing to energize. I am sure this is your problem. Keep me posted.
Posted on Feb 04, 2010
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Posted on Jan 02, 2017
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