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Furnace fan will not turn on when in "Auto" mode. If switch to "Manual" mode on thernostat, fan will come on, but doesn't blow warm air.

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Depending on which make aand model of furnace the heating blower relay or heating blower switching device could be bad when you switch the t-stat to manual or on that energizes the cooling blower relay is it gas or electric?

Posted on Dec 28, 2010

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1 Answer

My furnace is a Coleman model # 4084-6601. It won't light and the fan doesn't blow.


The fan will not blow until the furnace lights when in auto mode. You may have a defective igniter or gas valve.

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Home furnace comfortmaker blowing cold air


Home owner's manual? Troubleshooting section. Gas or electric?
If gas, pilot light may be out, or other gas controls. Are you sure you have gas supply? Do you have other Gas appliances so you can check? Furnace needs power for controls, fan and thermostat. Are you sure you have electric power to the furnace? Does the thermostat have a fan switch? If so turn it on and see if the fan turns on. If it does not turn on you may have a circut breaker poped. or some other reason power to the furnace is not working.

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Intertherm Furnace Model #mmhb070abhr06. Burner lights up but shuts down after about 10-30 seconds then recycles over & over again when fan is set to auto (because fan does not cycle on when set to...


Sounds to me like it is going off on a weak high limit switch. With the fan on it will prolong the event but will not stop it. I would check all of the high limit switches. It would most likely be one close to the heat exchanger.

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1 Answer

Furnace will not run when hooked up to electricity


Go to your thermostat and access the fan mode. Change the fan mode to Automatic, AU. This will stop the AC fan from blowing when the furnace is turned on. If the fan mode is on Hi or Lo and the furnace is turned on it will turn on the AC blower. Bad design...

Mar 02, 2014 | RVs

1 Answer

AC unit comes on, but fan doesn't work. It works with furnace.


check for loose wiring to Tstat, or the new stat has failed.
if the stat has a fan on switch and when on the fan works then replace the stat

Apr 10, 2013 | Heating & Cooling

1 Answer

Furnace blower runs after temp is reached


Is your tstat fan selector in auto?? Does the fan ever shut off?

Jul 18, 2017 | Heating & Cooling

1 Answer

I have a goodman furnace model number gms80904bncc. When the temperature in house is met the blower continues to blow. Even if I put the thermstat in off mode the blower is still on


Hi #1 check thermostat : see if the FAN ON/AUTO switch is set to( auto ) and not( on)...If this is not the case turn the furnace switch off for 20 sec. and back on...did it stop? IF so the blower relay is sticking and must be replaced.
AUTO=BLOWER ON DEMAND/CYCLING
ON=BLOWER 24/7 all the time..
hope this helps

Nov 15, 2011 | Goodman Heating & Cooling

1 Answer

My heater blows cold air why? I have a REAB 1010s need manual


Check your thermostat to see what your fan switch is set on. There should be two settings - auto and on. If it is set on auto, the fan only comes on when furnace runs. If the switch is set on on, the fan on your furnace is running all the time. Which means when temperature in the house reach what you have set on your thermostat, the furnace kicks off, but the fan keeps running and blows cool air. Some people run their fan all the time, especially if they have allergies, because that's a good way to clean the air.

Jan 02, 2011 | Heating & Cooling

1 Answer

The furnace send signal to the fan in about 30 seconds, now this fan is set in auto from my termostat, my problem is the fan is starting slowly and some time it don't start, but if I use the option manual...


Depending on the model of the furnace, the blower is either a 2 or 3 speed. When the furnace operates in heating mode with the thermostat in the auto position, the furnace starts the fan when the furnace reaches a specific temperature or after a set time delay, but it operates the fan in low or med low speed on heat mode, when you put the thermostat fan switch in the "ON" position, the furnace operates the fan in "HI" speed, the same speed used for cooling mode. You may have a blower moter that is starting to short. I would recommend having a professional replace the motor before now before it becomes an emergency in the middle of the night during a cold spell.

Oct 10, 2009 | Heating & Cooling

1 Answer

Furnace will not turn on in Auto mode thermostat


It sounds like you T-Stat is messed up. Look in your manual to see if there is set up instructions. If not I would change the T-Stat.

Jan 02, 2009 | Heating & Cooling

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