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Furnace come on then fan stops while burner still is on, then fan comes on for 1 min. and goes off over and over

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This could be a couple of things, first is the fan limit switch. Make sure your fan limit is set at the correct settings, there is a fan on setting and a flame shut off setting located on the front of air handler inside the front cover. Usaully set at 140 fan on 200 gas shut off. You do not say what unit you have so this could be a pc board or module. Second this could be the blower it's self over heating and shutting down, feel if motor is gettig hot. This could be a run cap. or motor it's self. But it is more than likely the limit switch.

Posted on Sep 29, 2008

  • Edward Boukater Oct 01, 2008

    I don't understand how you can sy this is not appropriate I've been on the a/c heating business 30 yrs. Is there some other info. I'm missing.

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My Ruud furnace used to regulate 1 deg +\- the set temp. Now it regulates right at the set temp and the fan cuts off while the burner continues to fire for a minute or so then the fan kicks back on for...


Hi,
It appears to be the fan limiter switch. It comes on at a certain temp when heating up and shuts off on the high end of its setting. Once the burners are shut down, the fan continues for a few minutes to cool down the burners. The limiter switch is adjustable but it sounds to me to be defective and should be replaced. Good luck and stay warm, :-)

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Hi I have an xl80 the burner lite and heats up till at desired temp, after burner goes out the fan keeps on running 15 minutes or so. If I go down and shut off power switch to furnace then the fan shuts...


Hi, sounds like you have a problem with the heat anticipator in the thermostat. If you replaced the fan limit, and with it running that long after the burners shut down, it would be in your stat. If it fires up after resetting breaker, was the stat set to call for heat? If not, the stat is faulty. If you remove the front to get to the stat wires, take a jumper wire and jump from RH or RC to W. Heat will start. Let it run for a minute or so and remove wire. If the fan shuts down with in a min. or so, you will know it was the stat. Good Luck and let me know the out come!
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Can you tell me the order in which each componet of a gas furnace comes on to start the furance?


Yes there is a sequence:
0:00 Dial for fan/limit switch is at 70 deg position. Furnace is cold. I turn T-stat to 80 deg to start furnace.
1:00 Burner comes on and dial begins to move slowly up.
2:30 Dial at 140 deg and fan motor comes on. Dial never goes above 150 deg.
3:00 Burner turns off. Dial slowly moves back towards 90 deg.
4:45 Burner turns on and dial is at 110 deg.
4:50 Fan turns off with dial still at 110 deg.
5:30 Burner off. Dial at 120 deg.
6:15 Fan on. Dial at 140 deg. Burner is still off.
7:00 Burner on. Dial at 120 deg.
7:40 Burner off. Dial still at 120 deg.
8:30 Fan off with dial at 110 deg., and it quickly snaps back to the 80 deg. position.
8:30 plus, cycle continues.....

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1 Answer

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If the burners do not fully ignite, the sensor will shut the furnace down. The lack of sufficient burner flame is a gas valve or gas pressure problem within the valve.
Replacing the gas valve with the original one may get you going. I surely suggest a professional service company for safety reasons and a thorough inspection. A 20 year old furnace is past it's normal life span.

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Get it looked at quick, before your exchangers crack, because the furnace not cooling them down after operation will lead to failure, and the replacement is not cheap, close to the cost of a new unit.

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1 Answer

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Ths is an easy problen to solve. Looking close to the burners is a pilot sensor. It looks like a thin metal pin about 1" 1/2 long. Clean this with sandpaper. This will allow you furnace to stay lit.

Hope this helps,

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