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What could be the problem with the furnace fan if it does not work? FAn reley, thermostat, fan motor ok.

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HI try the pressure switch chech the pilot ,

Posted on Feb 02, 2010

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3 Answers

I have new blower motor. it dosen't stop running


Could be a bad blower motor resistor,mounted by the blower.

Sep 28, 2016 | 2002 Dodge Ram Pickup 1500

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Can not get fan on to turn on. All else fine. heat only furnace. No air conditioning...only air circulation.I used to set it on "Cool" and "Fan On"and get air to circulate. Do I need new thermostat?


Since you have two thermostats that operate the heating unit and the fan, and the fact that neither will turn the blower on, I would suspect the furnace/ air handler. Turn the thermostat to heat and see if the heat and the fan comes on, if it does operate normally in heat, the fan relay or the high speed on the blower is most likely the culprit. (If the furnace is equipped with a circuit board, the fan relay is integral to the board, if it an older furnace it has a separate fan relay). If it does not operate normally in the heating mode, verify power to the furnace, see if the flame comes on, if it does: the fan motor, circuit board or the fan relay are most likely the cause. hope this helps!

Jul 20, 2015 | Heating & Cooling

1 Answer

My thermostat will start the furnace, but the fan will not work.


If it's an older forced air unit furnace, it's likely the inducer motor has malfunctioned. They usually make a lot of noise before they fail, but occasionally they just stop working without warning.

Mar 06, 2015 | Honeywell T87N1000 Round Thermostat

2 Answers

Plif my cooling fans stop working ,is it most likely the fan moto or reley switch


look at temp control switch that turns fans on its a sensor mounted on motor or close to fans

Oct 07, 2014 | 1999 Oldsmobile Cutlass

1 Answer

Lennox G12 furnace blower will not come on.


It may be a bad fan limit switch or a bad fan motor.to check the motor turn the thermostat fan setting to fan on or jumper between R and G where the thermostat wires connect to the furnace. If fan comes on the fan motor is probably good and it is probably the fan limit switch. If it does not come on it is probably the fan motor . This is assuming you haven't installed a new thermostat in which case it may be a heat anticipator setting too low.hope this helps.

Dec 07, 2013 | Heating & Cooling

1 Answer

Pleasureway Traverse furnace fan runs when funace is off.


Bad/ stuck fan relay or temerature sensor is not shutting the fan off. Or there is a short on the low voltage fan control circuit. Check to see if the Green terminal is jumpered to the Red terminal at either the furnace control board of the 'stat, if not, ohm the wires with both ends off- I've seen installers accidently shoot a staple thru the wire and short the wires together more often than even I can believe! Hope this Helps! PS Some furnaces have fan switches inside the furnace- check for one and see if it's "on"- sounds too simple, but sometimes the "simplest" is the correct answer.

Mar 22, 2013 | Heating & Cooling

1 Answer

Bryant programmable thermostat doesnt keep the temp have to put it on fan instead of auto


My guess is that you have gas heat. If this is the case, sounds to me like your main control board or depending on age of furnace, fan controller is not working. With gas furnaces, it utilizes 2 fan speeds. High for cooling, & Low for heating. Your thermostat only controls the High speed - switches when you turn your fan on & when there is a call for cooling. The only other thing I can think of is it is possible that the Low speed windings on the blower motor are open causing it to not turn on. Most motors have 3 to 4 speeds & only 2 are used. Switch the heat motor wires in the furnace (on the control board) with one that is on a spare terminal.

Feb 21, 2013 | Bryant Cube Series 1 Stage Heat/ 1 Stage...

1 Answer

Main blower stays on, burner fan on intermitantly,


All gas furnaces have a fan control of some sort. Either a mechanical fan control where there is a temperature probe that reaches into the heat exchanger compartment thru a hole in the panel that separates the control part of the furnace(this would be the front of the furnace where all the controls are) from the heat exchanger. This type of control is either a small black plastic control about 4 inches by 2 inches and about 1 1/2 inches thick secured to the panel with 2 screws. Or it is a slightly larger silver colored control that should have a pull off cover. It may say Honeywell on it. Either way the control will need replacing.
The other type of fan control is a solid state control board. This will most likely be located in the indoor fan compartment. It should be located under a covered control box. The box with all the wires going into it. This board will also need to be replaced if your furnace uses this type of fan control. You will need to bring your furnace model and serial number to a dealer that sells your brand of furnace or go online to a parts dealer that carries parts for your furnace. Hope I was of help to you! Good luck!

Nov 28, 2009 | Heating & Cooling

1 Answer

Sometimes the furnace doesn't come on when it should


OK so its an all electric furnace no gas? I cant think of anything clicking on an electric furnace except the sequencers or the safety switches.

If this is whats your hearing then the fan should definitely be running.

Feel carefully around the fan motor (I assume this is in a mobile home). See if you detect any heat coming around the blower area close to the fan motor. If so the fan motor may be at fault or one sequencer may be out (the main one of course...) the thing is can you get the fan to come on by turning the auto switch on the thermostat (or if older model the Auto On switch on the furnace) to ON? If so you can "limp by and have heat til someone either checks it or you can go on deeper into it. but to go deeper you'll have to let me know you know where the elements are and that you have a volt meter. and feel comfortable using it especially on HOT wires.

Mar 03, 2009 | Heating & Cooling

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