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Model Series MAC2254 hums after heating unit goes off. can turn fan switch off, it quits. what is wrong? audrey

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The humming can be the fan itself or restrictions in ductwork. ducts to small will create excess noise.

Posted on Dec 15, 2009

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Outside unit will only run for a short amount of time with A/C before the fan stops turning and starts humming, squealing/screeching and the top of the outside unit gets hot.


The bearings are bad in the motor and after the fan runs enough it eventually gets hot, making the bearing screech and the fan locks up. Need to replace motor again. See if it has a warranty. The reason it gets hot is because the fan is what removes the heat from the coil and if the fan isn't running there is nothing to cool it off so to speak.

Apr 19, 2016 | Heating & Cooling

1 Answer

Condenser fan on heat pump does not turn off


If it is just the condenser fan that means you have a fan relay that has welded shut. Turn power off to your unit and trace the wires from your condenser fan back into the control panel at the unit. You'll have 3 wires going to it. 2 go to the run capacitor and one goes to the fan relay. The one that goes to the fan relay is the part that needs to be replaced. If you have no fan relay and it goes to the main contractor, half of your main contractor is welded shut and will need to be replaced.

Sep 18, 2014 | Carrier 52PQ-515---3 Premier Series Heat...

1 Answer

My inside and outside unit turn on fine, out side fan and compressor running good,inside blowing cool air, about four minutes after that, out side unit shutoff, no humming, nothing.


Are you heating or cooling? When the outdoor unit shuts off how does it come back on. Or are you saying that the outdoor unit is short cycling off and on

Jan 17, 2018 | Ruud Heating & Cooling

1 Answer

Unit in roof, switch on and it hums and throws the safety switch s/n 26641/12/2, thanks


Turn power off to unit first. Then Try going up on roof, and with a stick or similar, through vent slots, spin fan blade a few times, and then try to start again. Seen quite a few stuck in dead spot at motor, and this will sometimes get it off the dead spot if fan(motor) hasn't been run in a while. If it has been running, and just recently started doing this, Capacitor is probably gone but need to be careful working with it, so get back to me if spinning fan blade didn't do it. Would be helpful to have model and make of unit.

Jan 28, 2010 | Heating & Cooling

1 Answer

Outdoor unit hums but fan doesn't turn. Nothing heats up but the fan just won't turn and is there a spot to oil the fan on the motor


The fan motor on the outside unit should be a sealed motor. If the unit is just humming is the humming from the compressor or from the motor being locked up. You could try spinning it a few times with the power off to see if this might get it to run and spray some penetrating oil under the fan blade right where the shaft comes out to the fan blade.

Dec 24, 2009 | Heating & Cooling

2 Answers

Unit will run if the thermostat is switch on ON, but if left on AUTO unit will hum and won't run.


For most Thermostats on and auto is for the fan switch function. There s usually another button for heat off cool. When you turn a\c or heat on , the fan switch should be on auto.

Jul 10, 2009 | Heating & Cooling

1 Answer

Fan hums


go on top the RV to the unit and take out the screws holding the cover on and the fan motor is under it

Jan 26, 2009 | Dometic Rooftop RV Air Conditioner

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