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I have this furnace, and all i hear is a hum, the unit does not kick on, the thermostat works with the AC, but the furnace does not kick in!!

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This is the sequence of events it takes for the furnace to take off:

Posted on Oct 14, 2010

  • jiriza84641 Oct 14, 2010

    I can hear a fan, but no pilot or flame!!

  • Leon Loveless Nov 03, 2013

    Most likely need an igniter

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1 Answer

AC unit does not kick in, NO hum from motor, blower on furnace comes on, Capacitor looks good, any other ideas? Could I have a bad motor?


There is a relay in the outside unit that is controlled by the furnace. You need to check that voltage is coming to it from the furnace. If it is then you need to change the relay. High voltage is present in the unit. Turn of the breaker before doing this

Jun 08, 2015 | Heating & Cooling

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No fan when ac kicks on Ihave a eb15b funace with a coleman ac


The heat will normally use a low speed on the fan, & the AC along with the fan switch on the thermostat will use the high speed. The thermostat turns that high speed on when there is a call for cooling & is the same switch if you were to manually turn the fan from auto to on. Try turning the fan on @ the thermostat. If it works, then replace your thermostat. If it doesn't, it could be a bad fan speed, a bad fan relay on a control board or external relay, or a loose or broken green thermostat wire.

Apr 14, 2014 | Coleman Home Electric Furnace Eb15b/Eb15d

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My furnace works on ac and blows on ac but on heat it does not blow but i hear a humming sound coming from the furnace


Most furnace operating on Oil or gas will heat the combustion chamber before starting fan to prevent cold air draft at start-up, can last a minute or two. Eiter the main flame does not come on or the chamber thermostat have fail. Try to modify fan option on room thermostat from auto to on. Cold air coming out: burner problem or no more oil or gas, warm air: burning chamber thermostat problem, leave room thermostat fan option to on until repair.

Jan 02, 2014 | Comfortmaker Heating & Cooling

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Multiple clicking sounds coming from AC unit before AC unit turns on or before furnace turns on.


the is a 24v wire that feeds from your thermostat to your unit, inside there is a contactor that engages, this makes a click sound as it really is a basic mechanical part the makes metal touch metal to allow current to flow through the system, perfectly normal, your hearing the low voltage engage the highvoltage at the contactor.

Jun 18, 2013 | Dometic Rooftop RV Air Conditioner

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I have a goodman gsc13 ac unit about 4 year old. When the temp gets around 90 or above outside the fan on the unit starts but the compressor does not. I had service check it out but that day they were...


It sounds like the unit may be over charged. Make sure the outside coils are clean and you have plenty of airflow coming out of the top of the outside unit. What could be happening is, when the temps get higher outside, so do the pressures in the system. The compressor has a thermal overload protection that will kick the compressor off if it gets to hot, which if the compressor is over charged, it will work twice as hard, over heat and shut off. You would need a technician to come out and get the refrigerant charge back to normal. Another thing that could be happening is a weak or faulty capacitor, which is a small round or oval metal object, found in the electrical compartment on the unit. This are fairly simple to change out if your comfortable with electric. I've also had to put what's called a hard start kit on compressors with the same problem, new and old. The hard start basically gives it that extra boost of power to get it up and going. I would start with the refrigerant charge and go from there. The electrical "humming" sound that you hear unless you turn the breaker to the furnace off, is the contactor on the outside unit having a call for cooling. The 24 volts come from the furnace, to the outside unit, and pulls the contactor in to power the unit with the 220 volts supplied. It is normal and you don't have to worry about that at all. I hope some of this helps and good luck!

Jul 05, 2011 | Heating & Cooling

2 Answers

I turn my thermostat to the HEAT position, I hear the Thermostat click and the Furnace begins to hum but no air comes out of the vents. Also if i turn the fan to the ON position air will come out of the...


need to go to furnace and watch it...if your hearing a hum the enducer draft motor may have failed...it should start first if there is no fault codes...reset unit by unplugging furnace or in some cases turning power switch off...turn thermostat on heat and watch unit ..the small enducer draft motor should start first the a ignitor glows and the should light...goodman units have a control board with a light on control board when it fails should flash a code and on the door or inside on lable should give you what that code is...hope this helps good luck

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Having a problem with my AC/Furnace. AC was working fine and was turned on for about 3 weeks. Thursday night it cooled off and we opened up until Saturday morning. On Saturday morning the AC would not turn...


I think your problem is poor usage of the device,i.e. overloading the system. try running better cables to your furnace and ac. The reason i am lead to believe that is. If you already hired a pro to come and fix it for you,and he/she could'nt then what else could it be? in my experience ac units use electricity like microwave ovens.and power tools

Sep 12, 2009 | Heating & Cooling

1 Answer

Trane XE90 both ac unit and the furnace kick on at the same time


How about the Heating/cooling thermostat. Sounds like you better check it.

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AC unit turns on blower doesn't come on


The thermostat is the controller.

Jun 19, 2009 | Heating & Cooling

2 Answers

Furnace runs on heat, air conditioner does not


If you have a Gas furnace in the Attic then the answer is yes. The outside condenser will not run if in fact you have a gas furnace.

Feb 11, 2009 | Ruud Central System Air Conditioner

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