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Furnace starts flame come on 3sec then goes out it doe,s this 10 times then starts and runs but air feels cold coming out warm not hot like before

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Sounds like you could have 1 of 2 problems:

1. The flame sensor is dirty. The flame sensor is a small rod just a little bigger around than a pencil lead. It is located in the burner section just a few inches left or right from your glow ignitor. The flame will surround this sensor, but it the sensor is dirty, it cannot sense the heat of the flame. Take the sensor out of the furnace. It generally has one screw holding it, and one wire connected to it. Use emory cloth or light sand paper, or even a small wire brush to clean the sensor. DON'T GET IT WET.

2. You may have air in the gas line. This happens especially if the gas has been turned off to the house. You can bleed the gas line by loosening the gas line connected to the furnace. (furnace turned off) Bleed it just for 10 seconds or so, tighten the gas line, check for leaks with soapy water, and try the furnace again. You may have to do this more than once.

Posted on May 21, 2011

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Tractorman44 thanks but misunderdstood husband! When thermostat turned up the fan comes on before flames ignites. Plenum heats and furnace runs.


If the fan comes on first, then the flame ignites, it USUALLY indicates there is a problem in the ignition process of the furnace. Most new manufacturers have the adjustable 'time off' sequence for the blower, and most initiate a call for the blower to run within a pre-determined amount of time AFTER a call for heat has been established. ALSO, and this is where I think the problem is, the ignition sequence starts immediately upon a call for heat. If there is a heat ignition failure, it will attempt a restart. USUALLY, they allow 5 restarts within a certain timeframe then the circuit board locks out the heat sequence until it is reset by cycling the power or cycling the thermostat manually.

What I think is happening with yours it that your ignition sequence is experiencing a 'flame failure' upon a call for heat....then it re-establishes the ignition sequence, which takes another 30 to 45 seconds. During this time, the blower automatically starts (because the allotted time has expired) and blows COLD air because of the initial flame failure. In the meantime the ignition sequence establishes a flame on the second or possibly the third try and then you feel the warm air.

IF this is the case, ultimately what will happen is that the furnace will continue to experience 'flame failure' and eventually fail to the point of 'flame failure lockout' and you will have no heat, but the fan could possibly run continuously.

At any rate, without being able to be there to troubleshoot and test components physically, this is just a calculated and reasonably reasonable guess. What it is telling you is that you probably need to contact a reputable, reliable service organization to give your furnace a good going over before it lets you down on a good cooooold night!!!

I hope this helps you understand the basics of what happens within the system and bear in mind, this is a 'generic' sequence and possibly NOT the exact sequence of your particular furnace.

Oct 01, 2015 | Heating & Cooling

1 Answer

Furnace won't stay lit. Intertherm Model M2RC-080A-16BN. Ignightor glows, flame starts and after a few seconds the flame shuts off. Then it starts the cycle again. It goes thru this cycle a fe


It sounds like the flame sensor is bad. If thats not the case you may need to replace the control board. You should make sure the flame sensor is directly into the flame.

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1 Answer

My furnace works on ac and blows on ac but on heat it does not blow but i hear a humming sound coming from the furnace


Most furnace operating on Oil or gas will heat the combustion chamber before starting fan to prevent cold air draft at start-up, can last a minute or two. Eiter the main flame does not come on or the chamber thermostat have fail. Try to modify fan option on room thermostat from auto to on. Cold air coming out: burner problem or no more oil or gas, warm air: burning chamber thermostat problem, leave room thermostat fan option to on until repair.

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1 Answer

My Coleman Evcon furnace Model EB 12B will start out blowing warm air and then before it reaches the temp set on thermostat starts blowing cold air. We had the thermostat changed over the summer and the...


look at the furnace and turn it on to see if the flames come on. Watch and see if they stay on for a period of time. If they come on then go out you may have a dirty flame sensor, if it goes out and then relights it may be a high limit switch getting weak. hope this helps.

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My furnance (Amana 90) will not work when it's extremely cold outside. I have checked and replaced the flame sensor. I've checked the pressure switch. The furnance is a champ at all times other than...


Since it only does this in extremely cold times is there any chance that your drain line from the condensate drain is passing thru a space cold enough to freeze it. Good luck and thank you.

Feb 23, 2011 | Heating & Cooling

1 Answer

Amana Air Command 80 SSE gas furnace will not stay running


In the path of the flame on the last burner that starts, there will be a small rod. That rod is the flame sensor. Take a scrub pad and polish it. Also check the electrical connection that goes back to the circuit board. Disconnect any ground wire from the circuit board to furnace cabinet, sand it and replace it.

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1 Answer

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depending on age, it is probably the thermocouple, or the flame sensor that is dirty.

Feb 15, 2010 | Heating & Cooling

2 Answers

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change the filters first thing. Make sure it is operating correctly. You can use another thermometer and leave in room and see if it matches the temp on theremostat. Forced air is a little cooler. Make sure all your vents are open.

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