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Furnace lights but fan kicks on and off every 5 seconds

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  • Todd Born
    Todd Born May 11, 2010

    how cold is it in the house?

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Was the unit short ccyclin gon the fan limit conntrol? its supopose to come on when the heat exchanger get to a set number of degrees and cyle off when it get cooler. if its real cold inside and its cycling that may be oyuer problem.

Posted on Jan 06, 2009

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You should try to clean flame sensor

Posted on Dec 21, 2008

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1 Answer

LX2000 gas furnace. It starts and runs for about 5 seconds, then why does it shut off?


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Dec 16, 2015 | Heating & Cooling

1 Answer

Heil nulk075dg05


You have a dirty or bad heat sensor. When you remove the front panel on you furnace you will see a probe that is 2 or 3 inches long that is in the flame when the furnace fires up. If it doesn't detect a certain temperature within the first 30 or 40 seconds it shuts down the furnace. You can either clean the probe off with sandpaper, or purchase a new one. They aren't very expensive and are easy to replace. In my experience it is usually a build up of carbon on the sensor and a good cleaning with sandpaper and alcohol usually takes care of the problem.

Feb 04, 2014 | Heating & Cooling

1 Answer

I have a bryant gas furnace plus 90 the furnace kicks on and the pilot lights but the fan that blows the heat thru the house wont turn on! I keep getting error code 44 and 41 what can i do to fix that?


make sure fan wheel turns freely
check for voltage to fan--if you have voltage check capacitor output against capacitor rating, must be withing 5%, if that checks out replace blower motor

Jan 17, 2014 | Heating & Cooling

2 Answers

Furnace kicks on then shuts off


Coleman furnaces us a temperature delay with a temperature on around 130F to 150F and off around 110F.

If the inrush of cold air cools the delay below the off temperature the fan will go off until the heater heats it up to the on temperature.

Jan 06, 2014 | Coleman Home Electric Furnace Eb15b/Eb15d

1 Answer

I have an evcon furnace that was put on brand new about 5 years ago. I have noticed that it doesn't seem to be kicking off and it doesn't seem to be heating my home either. A line was kinked last year...


This going to be little lengthy. The fan can be on from two reasons. If your thermostat has a fan switch, it will say ON or AUTO. Put it to AUTO. Turn your thermostat to its lowest setting and wait 3 or 4 minutes. If the fan stays running, the problem is in the furnace. Newer furnaces have big circuit boards that control all its functions. The fan automatically starts after a factory set period of time (about 45 seconds). Try a HARD reset to get all the furnace functions back to normal. Turn your thermostat as low as it will go. find the breaker or fuse that serves only the furnace. Unscrew the fuse or turn off the breaker for a good minute and replace/reset it. If the fan starts right away, the board is probably bad. PC relays often arc together and the entire board will need replacement. If the fan is off, turn your thermostat way up and see if the furnace lights. The fan will probably restart in a minute or so as a normal function, heat or no. If the furnace does not fire, Let me know and I'll tell you how to check that switch that was replaced.

Oct 24, 2013 | Heating & Cooling

1 Answer

My furnace blower kicks on and the flame lights for about 5 seconds then kicks off. I replaced the igniter recently. The service trouble light blinks continuously.


Your furnace may be kicking out on high limit. Its possible your circ. or blower fan needs to be cleaned. If you don't get enough air moving across you heat exchanger it will kick off on high limit.

Jan 14, 2011 | Goodman GMS90703BXA Heater

1 Answer

Furnace kicks off and right back on


If this is a newer furnace, an indication of an error is that the room air blower stays on. Get in front of the furnace and see if you can see any blinking lights. Try not to remove any panels as you will erase any error codes. There should ba a small viewing port that you can look through. Once you count the blinks, look at the wiring diagram for the error code chart. It may give you a starting point. Can you tell us a make and model number of the system?

Dec 29, 2009 | Heating & Cooling

1 Answer

Flame goes out when fan kicks on


If the flame lights all the burners within 2 seconds but does not stay on, you may need to clean the flame rod found at the farthest end of the burner box. It will be located at the end of the box that lights last. It will be a probe that is in the flame of the last burner. If it has carbon on it or scale, take an old tooth brush and scrub it. Check the wire connected to it and follow that wire back to the circuit board and check that connection.

Dec 11, 2009 | Goodman Heating & Cooling

1 Answer

The furnace attempt to light, you can see the


The flame sensor is not sensing the flame. Google "flame sensor"

May be an adjustment or control board problem.

Dec 08, 2009 | York Furnace Draft Inducer Blower Fasco #...

1 Answer

Dayton blower fan repeatedly kicks on and off


chech the air filter is clean and the fan limit switch look to change fan limit

Nov 01, 2008 | Dayton Gas Furnace Heater

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