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12GCS048X-100-4PA (Lennox) heating is not working. Machine has humming sound. blower not automatic on like before. No heating air. Fan only work on manual. Please help. Thanks

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 217 Answers

SOURCE: Kia Rio - Heater not working fan works but noise coming from fan.

open glove box and make sure that none of the papers from that can get down to blower motor

Posted on Jan 18, 2009

pierre1811
  • 144 Answers

SOURCE: Air Handler Blower Unit Humming

More then likely it's the transformer. It may be getting weak. I've seen them hum/vibrate almost new and last for years. It's more an annoyance than anything.

Posted on Jan 18, 2009

  • 17 Answers

SOURCE: Lennox furnace not heating up

sounds like the ignitor is bad. there shoule be a 2 wire plug going to it. after the inducer motor starts, you can check the voltage at the 2 wire plug located under the burners. you can unpug it to check voltage or you can probe the back side of the plug with a volt meter. if you are getting 120v but it is not glowing, it is bad. you can also ohm it out while it is off.

Posted on Feb 02, 2009

  • 659 Answers

SOURCE: My Lennox Air conditioner only heats

It is possible that it's the thermostat. When you turn it into cool mode, does the unit come on at all or is it silent? If nothing is coming on, then it's likely it's the tstat. Did the tech check the refrigerant charge while he was there? He should have checked it with the auxillary heat off and the unit just in heat mode. Make sure that the condenser unit outside is coming on when you are calling for cool, If you turn it on and everything comes on, go outside and put your hand on the large copper pipe coming into the unit. In cool mode, this pipe will be cold to the touch and in heat mode, the pipe will be warm to the touch. There isn't much you can do on your own with the exception of changing the tstat. If you can answer some of the questions I have posed, I can try and give you some more answers. Just remember that a check up doesn't mean its a guarantee that something won't happen the next day, it's just that everything was in working order at the time of the checkup.

Posted on Mar 21, 2009

  • 38 Answers

SOURCE: lennox air unit not blowing cold air

your fan motor outside is going bad, have a service company change it out for you.

the motor stopped working and that overheated the compressor shutting it down on thermal cutout, and it will only come on once it cools down

Posted on Jul 01, 2009

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1 Answer

I have a lennox pulse 21 And if i set the thermostat to auto the unit kicks off after a min and the limit switch goes over 200. But if i keep the fan on the unit works fine.


See if you blower speed is set to low speed in the heat mode.
I think what might be happening is the blower is set to low speed in heat and when you switch to automatic, the blower is switched to high speed. You may have to change the blower speed to high in the heat mode. If not you may have an airflow problem such as a Dirty filter, ducts not sized right, dampers on the room outlets closed.

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My lennox ecb29 electric heater heats but the blower does not come on and the breaker flips. . It will heat the room if I leave the fan on.


Hi,

Okay... does the blower work or not???

Are you saying that if you turn on the blower first then it will run and the heater will then heat???

If that is the case then I would say that the blower is pulling too much current on the startup and then tripping the breaker if the heater is drawing also...

Try changing the motor capacitor...that may be bad or going bad...

Also you may just have a breaker that is going bad...

Try changing the breaker if changing the capacitor does not help...

heatman101

Dec 07, 2010 | Heating & Cooling

2 Answers

Lennox Fan will not come on when set to ''auto'' position.


Expensive is relative, service calls are never free. But if you have an idea what the problem is, you are armed against an unethical service company. Now to what you describe, could be a couple things, first let me explain the difference in fan speeds. Furnaces that both heat and cool have multi-speed blower motors. High speed is for cooling and lower speeds are for heating. The fan switch at the T-Stat turns on the high speed fan relay. The lower speed fan is turned on by either a temperature activated switch (silver box mounted on front on furnace above burners) or a time delay relay which is solid state. That being said, your problem could be a defective fan switch or one of your blower motor windings has gone bad. Most motors have 3 or 4 speeds and a technician could just change speeds and all would be good. A fan/limit switch is not so expensive that you would replace the unit. Bottom line, unless your really handy, a heating company is in your future. Good luck and please rate my answer if it was helpful to you.  

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Fan Not Working


either bad condenser fan motor or fan capacitor

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I have a thru the wall fedders ac unit. The heat stopped working when you turn it on it just hums.


no blower !!! or heating element is bad or switch try putting the fan on only if it works than it is probaly the switch not letting the blower on only heat

Apr 01, 2009 | Fedders Y Chassis AEY12F7E Air Conditioner

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Lennox air conditioner is blowing hot air


Check your coils for ice, check your breaker and fuses for condensing unit, and is your condensing fan running? If not, you either have a bad fan motor or capicitor. After you hit the button, and wait for it to time out, (you should hear a click) take a butter knife, and spin the fan if it is not moving. If the fan start spinning by itself after your assistance, you have a bad capacitor

Jan 29, 2009 | Heating & Cooling

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Heat Pump hums, clicks and does not come on sometimes


yes the start capasitor starts the fan motor and the contactor pulls together when the t-stat tells it to start and it has a spring in it that gets week , some brands of units have a delay in the outside units board to stop it from starting at the exact same time as the airhandler

Jan 08, 2009 | Heating & Cooling

1 Answer

Furnace Blower stops working after 15 minutes


Replace the blower motor. Cleaning of the blower and motor will help in the moving of more air but will NOT eliminate the real problem in the motor bearings. Over time the lubrication will dry out and bearing wear results.

Nov 12, 2008 | Heating & Cooling

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