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My furnace goes on and shuts off after about 2 minutes. if i reset it, it works but only blows cold air

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I needed to change the filter, it was keeping the air fron outdooors coming in.

Posted on Dec 15, 2008

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Do you have t sat fan switch in on position??? If so blower will run continously set it to auto and it will cycle with heat call

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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.

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York Diamond 90 furnace blows cold air


There maybe a few issues. They have multiple safeties on furnaces. With this in mind this process to find the problem would take a Technician to check these safeties. It could be a flame sensor or thermocoupler each senses a flame or heat to keep the gas going. Also the damper for the flue must open for the gas to stay on. There may be more safeties on this and each safety sends a 24 volt current back to control module in order for the gas valve to stay open. If these aren't being met it will try around three times and go into a lock out mode which will keep gas shut off entirely.

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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...


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Trane XR80 blows cold air. Inducer motor comes on, glow bar glows for few seconds than goes out and inducer motor shuts off. Immidiatly after the main blower comes on and blows cold air. Will blow until...


I know that it's easy to spend someone elses money but in my experience when you get one actig that erratic it's usually the control board. I would check all the wiring including thermostat. You never know you might get lucky. I hope this helps you. Thanks

Nov 29, 2010 | Heaters

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

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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!

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My burner goes on but shuts off early and blows cold air. it is a goodman furnace. where should i start to solve this problem. i just had furnace cleaned and flame sensor cleaned. should i buy a new flame...


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Oct 17, 2009 | Goodman Heaters

1 Answer

My fridgidaire gas furnace is blowing cold air however when I shut off the breaker switch and turn it back on the furnace seems to work correctly. I have a digital heater and when the program tells it to...


Today’s furnaces are controlled by a computer which constantly monitors for problems. When it detects a problem it will shut off the burners. Depending on the problem and the specific furnace it will either “lock out” the furnace or cycle it through a purge (to rid it of un-burned gas and excess heat) and then attempt to re-start it. If the problem continues to occur then it will “lock out”. Depending on the problem and the furnace it may again attempt a re-start after several hours. In any case if the problem was not detected/caused by a sensor which requires a manual re-set, when the power to the computer is interrupted or the call for heat is interrupted the computer is reset and it will again attempt to re-start the furnace. The most common problems are:
· Low or lack of flame sense. Different furnaces use different methods to detect a flame – often these “flame sensors” become dirty and have to be cleaned (usually with sandpaper or steel wool).
· Bad igniter. (Doesn’t light at all).
· Clogged combustion air intake or exhaust.
· Clogged condensate drain. (90+% efficient furnaces).
This is not a complete list, only the most common!
Depending on where you live your HVAC system runs more than anything else you own (including your car). All furnace manufacturers “recommend” “regular maintenance” of your furnace. In fact, all that I am aware of state in their warranty that the warranty may be voided due to lack of “regular maintenance.” The industry has defined “regular maintenance” as yearly (in fact, some manufacturer’s warranties state yearly). Due to safety, liability, and the need for many other things to be checked, cleaned, and/or adjusted (2-page checklist where I work) to ensure safety and efficiency. Due to the large number of furnaces and the differences between them. Moreover, due to the terms of this site, I WILL NOT AND CAN NOT give you specific instructions on how to perform repairs on your furnace. I suggest that you contact a local, reputable, HVAC service company for (a tune up, preventive maintenance, general maintenance, yearly service call, general service, or whatever they call it).

While I may not have told you how to fix your furnace yourself, I have told you how to fix it. Please rate my answer.

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Auxilliary heat just started blowing cold air


SOund like you heating element has a open limit or the sequencer is bad. Another thing that it may be is the element wire has broken. Either way it sounds like you need a technician to come out and repair.

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