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Is it normal for the outdoor unit on my coleman h/p to make a surging humming noise? the fan does not run during this period, approx. temp. is 28 degrees F. the fan runs 30 seconds befor the unit cycles off.

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Sounds like your unit is going into defrost mode. When this happens the fan in the outdoor unit shuts off so you get more heat in the outdoor unit to defrost the coils. The heatpump is basically in A/C mode during defrost and the electric heat strips will kick in so you don't feel a cold blast of air in the house.

Posted on Jan 03, 2011


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Air handler fan comes on fine; compressor hums but does not start.

If you hear the o.d. unit humming:
•Check you breaker(s) both at breaker panel and at disconnect near o.d. unit if you have one.
•Behind the outdoor electrical panel, the part that is humming may have a bug/ants in it not allowing it to close. If so turn of all power(t-stat & breakers), clean points(where ants may be at the only moving part at the o.d. electrical), I usually use a little flat head, and try to start unit again.
•The run capacitor may be at fault. This component holds voltage and caution should be taken! This one is a round or oval part with wires connected to is, normally a metal or plastic body. If the top(where wires connect) is round/swollen or has oil looking stuff coming out, its at fault. Turn off power! Discharge by touching a screwdriver to the wire terminals at the capacitor to the metal cabinet. It may spark/pop if it discharges! Don't touch anything with you hands or any part of yourself. Replace with the exact capacitor it has on it(uf rating). Capacitors have been known to hurt people or worse!
Its always beast to call a tech. These 3 issues are the most common and it could be the o.d. fan has stopped allowing the compressor to over heat. Or a broken wire that allowed the unit to over heat. Work safe! And an HVAC tech is always the safest choice!

Jun 18, 2015 | Heating & Cooling

1 Answer

There is a loud humming coming from outside unit, the fan is not rotating.

Your question does not include what type of system you are asking about, but the assumption is that it is a heat pump. The loud humming is the compressor running by itself while the fan is off.

This is the typical way a reasonably new heat pump operates:
There is a coil temperature sensor that initiates a defrost period to eliminate the frost/ice build up on the outdoor coil. In the defrost mode, the outdoor fan shuts off and the reversing valve in the heat pump reverses the direction of refrigerant flow to warm the outdoor coil. The same coil temperature sensor senses the temperature of the external surface of the coil and tells the defrost control when the frost is gone initiating another 'reverse cycle' to put it back into heating mode. In the heating mode, the outdoor fan runs again.

If you have the heat pump installed where snow drifts accumulate, you will have a problem extracting heat from the outdoor air, and coil frosting and freezing will be exaggerated. If you have excessive ice build up due to a defosting issue, the ice can actually stop the fan from rotating, but you would hear loud bangind and rattling for hours first as the fan blades come in contact with the ice.

If you do not have drifts, but continually have an excessive amount of ice build up, either the sensor is possibly faulty or the defrost control board is faulty. The sensor's clip could easily have been knocked loose from the coil by ice and is no longer sensing coil temperature and if so the result would be the lack of defrost initiation.

Feb 13, 2015 | Heating & Cooling

1 Answer

Goodman model CLJ30-1D humming but not cooling? Help it's 9pm and 100 degrees outside

Hello, so both the fan and compressor were not running? Sound like the capacitor is bad, usually when the temp gets that hot the capacitor overheats and goes bad. The capacitor is located in the outdoor unit inside the control panel, it looks like a round or oval can with wires connected to it.

Jun 27, 2012 | Goodman Heating & Cooling

1 Answer

My coleman mah 3 roof top will not blowon fan side

Sounds like you have either a bad fan motor or a bad fan motor capacitor. When you turn the unit on with the fan not working, the compressor (the humming noise) runs and gets real hot real quick resulting in the compressor cutting off ( the nothing after) on it's inside high temp switch. This is what the compressor is designed to do so that when this happens, it does not burn the compressor out. Replace you fan capacitor, give the compressor an hour to cool, then try it. In most cases and if I'm correct, the unit will run just like you want it to. Good luck.
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Sep 09, 2009 | Coleman Mach III Air Conditioner

1 Answer

Unit is running, but is no longer cooling. Fan is blowing, but air is not chilled (or cold). Unit has been running fine until a couple days ago. It has been turned off for the last 12 hours and tried...

not sure if it is a package system or a split but this is what you do.go outside where your outdoor machine is, after it has been shut off for awhile, and you should hear 2 distinct noises.1 is the outdoor fan, you should see it spinning.the other is a comppressor hum.some compressors have noise bags on them so listen closely thru the fan noise.if you hear no hum listen for a hum about every 2 to 5 minutes.if you hear this hum every so often, chances are you compressor is seized or stuck.the only thing to do there is get a tech and try a big boost to get it going.

Aug 07, 2009 | Fedders A6P09S2A Air Conditioner

1 Answer


whats going on is your outdoor fan motor is over amping itself and causing it to go into heat overload shutting down the fan. It needs to be replaced

Jun 10, 2009 | Carrier Heating & Cooling

1 Answer

Runs well until temps reach 90+ F ,continues running + indoor heat slowly rises from 76 to 80 within 4 hours

The unit could be under sized for your house but if its been working fine before this year then you're probably low on charge, the indoor filters or coil are dirty or the outdoor coil is dirty or fan motor not running at full speed.Check the outdoor coil and charge first.

Apr 23, 2009 | Coleman Heating & Cooling

1 Answer

Refrigerator noises

your refrig will have "normal" off cycles for when the temp control is satisified and when it goes into defrost cycle. normal run time for most units is 60-80%. main thing though is that your temps are normal. thx peyton

Jan 22, 2009 | Jenn-Air JCD2389G Side by Side...

1 Answer

The fan is turning on a coleman outside air conditioner unit

Hey, do you hear the compressor sound (humming) if not check the little silver can to see if its bulged out the top due to power surge! If, bulged, replace it. Thank-you-very-much!

Aug 29, 2008 | Coleman Heating & Cooling

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