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I have a 2012 Luxaire gas furnace, Sometimes the blower will not shut off which causes cold air to blow into the house. What do I do to fix this problem.

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  • Heating & Co... Master
  • 3,315 Answers

Check out automatic fan control .AFC it should shut on temp fall it may need a clean on the back of it .

Posted on Jan 03, 2017

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Posted on Jan 02, 2017

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Error code= two red flashes, lockout/ no flame


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cause this fault. 2 RED FLASHES: This indicates that thenormally open pressure ... The furnace will lock out for one hour and then restart. 7 RED FLASHES: This fault code indicates that the flame could not be established. This no-light ... problem. Bothheating and cooling operations will be affected. Check

Jan 23, 2016 | Heating & Cooling

1 Answer

Luxaire by York Furnace,Model# G8T10012UHB11A,8 Red LED Flashes = Ignition lockout due to recycles,Has flame for a few seconds then goes off; does it around three times,Fan is working; blowing cold air


It sounds like you have a dirty or bad Flame Sensor. They sometimes get a white coating on them. It's not detecting a flame so it shuts off. Sometimes you can clean them and they will work.

Nov 06, 2012 | Coleman Heating & Cooling

1 Answer

Coleman furnace running, won't shut off, blowing cold only


Hello, the blower will run continues if 1) the limit switch has tripped 2) the relay on the intergrated control board is stuck Try tapping on the control board and let me know if it shuts down.

Nov 04, 2012 | Heating & Cooling

1 Answer

House heater does not blow hot all the time. the furnace kicks on and then shuts of and then the blower just blows cold air. the furnace tries to kick on three times but shuts off, sometimes it works just...


When it blows cold air, there should be an error code blinking on the LED light located on the PC board. Look through a small viewing port in the front panel, then remove the front panel and on the reverse side there should be a diagnostic code chart to help you figure what is wrong.

Mar 15, 2011 | Coleman Heating & Cooling

1 Answer

Our Armstron (magic Chief) oil furnace keeps shutting on and off during the heating cycle.


I will try to help, but a little more info would be great, when you say it shuts off, it is important to determine if it is the burner or the blower that is shutting off.
If the burner is shutting off and coming back on, the safety "fan and limit" control is getting to hot,,
If what I have listed above, there are several things that can cause it;
1. The first step is to make sure that the air filters are clean, the return air grills are clear, no objects covering them.
2. This part needs to be approached with care, Turning off power to the furnace is a must; then clean the blower area, and if it is a belt driven blower setup, inspect the belt, looking for cracks on the surface that makes contact with the pulleys. If the belt is old, it may be stretched and slipping on the pulleys, reducing the air that is being blown across the furnaces firebox, this will cause the furnaces safety "fan and limit" control to over heat and shut off till it cools off, then it will turn back on.

If the blower is the one that is shutting on and off, you would notice this at the supply registers in each room, air blows, then stops. This usually caused by really cold air blowing across the firebox, like after the house has been cold - over night, and usually will start operating more along the normal side of things as the home warms up.
Either the blower is moving to much air, blowing strongly in each room, or the furnace has been reducein it's firing rate - derated - a smaller nozzle being installed would be the main cause.... this is the first thing to check,,, if that doesn't do it, it would be highly recommended to have a experienced repair person look at it.
Remember when working in the blower area, please turn off the power to the furnace to save the fingers.
I hope this will give you a game plan.
Have a great evening.
Sincerely,
Paul Gibson

Mar 30, 2010 | Heating & Cooling

1 Answer

My furnace heats the house well, but during the cool down it actually blows cold air dropping the temperature causing the furnace to re-ignite. How do I adjust? Goodman - GMS9/GCS9


Depending on the age of the furnace you may be able to adjust the cool down. On some furnaces there is a silver box usually made by honeywell. This is your fan limit control. If you take the cover off you will see a dial with different temperature settings with 3 pins in a grove. The first one is fan on with temperature rise this turns the blower on when the furnace starts and warms up. The second is the fan off after furnace shuts down, this would be the one you want to adjust to a higher temperature to keep the blower from blowing cold air. The last pin is the high limit if the furnace gets to this temperature it will shut the furnace off but keep the blower running. Make sure that the thermostat fan option is set to auto and not on.

Jan 02, 2010 | Goodman GMS90703BXA Heater

1 Answer

The floor vents in our house are blowing cold air instead of hot. What can we do to fix it? What would be causing this?


If the furnace is running and the registers are blowing cold air you have a problem with the furnace. Check to be sure the pilot lite is lite if this is a standing pilot, if not check to see if there is a flash code in the site hole in the bottom blower door of the furnace. Be sure the thermostat is set to heat and turned up.

Jan 02, 2010 | Heating & Cooling

2 Answers

Gas furnace is constantly blowing cold air


An indoor blower running when it is not supposed to usually indicates an overheat condition. I would guess that it has been cycling on and off for some time and finally caused the high limit to stick and not auto reset. if you tap it sometimes they reset. the real problem is that it has been overheating from lack of airflow, over sized unit, not enough return air, too many closed registers, dirty filter, dirty squirrel cage blower and or air conditioner a-coil. If you get it started again sit and watch the unit run the flames should come on and stay on for the entire heating cycle, not going on and off.
I wish I could help you more but it is difficult without seeing the problem myself. Good luck! this should get you started!

Nov 01, 2009 | Heating & Cooling

1 Answer

Furnace will not light, but there is gas to the house


This problem will need to broken down in several steps. First, reset all the breakers that operate the furnace and ac. Turn the thermostat to on and the ac to off and see if the furnace blower starts. Get back with me.

Aug 12, 2007 | Haier HWF05XC5 Air Conditioner

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vulcan bonaire comfort control External natural gas electronic ignition 2004. ISSUE: Fan blowing only cool air continuously. Forced to kill power to stop it. model is one of the following. MB514E,20E or 30E. Going by mech drawing parts list. i can confirm what type of sensors i have cleaned with very fine sandpaper. flame sensor PN 5441603SP and IGNITER ELECTRODE PN 5441602SP The fault code i see is described as the following. There are x4 LED's. Sequence Left to Right. LEGEND: 1 Flame Sensor 2 Pressure switch 3 OverTemp 4 Diag. R Red G Green S Solid Colour B Blinking LED Behaviour. In order 2RS & 4GS Until i hear ignition. 2RS & 3RB Duration: split second 2RB,3RS & 4GB Duration: split second 3RS & 4GB Duration: Until it has completed blinking x4 times. 3RS Duration 4 seconds Repeat last two mentioned behaviour. in my own opinion, as a safety feature, the unit thinks that it has overheated or is about to. so kills the gas and force feeding cool air to heating components to save it from frying. Does this mean i have fault 04 if so does this mean i may have a faulty igniter or flame sensor or maybe a faulty as described in the mech drawing SWITCH OVER TEMPERATURE 120 degrees celsius. Am i correct here? Is this the over temperature cut out switch? if no one can really pinpoint which part requires replacement, can you at least, in sequence advise which parts to purchase? so then ill just try my luck. i wonder how to properly test if flame sensor, igniter, over temp etc is faulty with a multimeter. do i just perform a continuity test. I wonder what other parts can i test related to this fault im getting.

Jul 22, 2018 | Vulcan Heating & Cooling

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