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Will not ignite, the fan blows cold air but no flame. I do not know how to reset or restart the system.

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Dear sir

please first turn off your air conditioner,s main supply switch and after two minutes turn on reset its mode and select heat mode and reset temperature settings by remote control( if there is not using remote control system then reset by selector switch) . i hope after that it will work again.


hope answer the question \
thank you
please vote!

Posted on Oct 03, 2010

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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.

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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

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Can you verify if the igniter is receiving 120 volts?

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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.

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1 Answer

Turn up t-stat, circ fan runs, hot surface igniter glows burner lights blows warm for a short time and then goes cold, flashes 1 flash, ignition problem, no flame when acting up. model# DGAA070BDTB.


The thermocouple lets the control know the flame is burning, and if it doesn't sense flame it shuts off just what you describe. Sounds as though you need to replace the thermocouple.

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1 Answer

The blower fan comes on several minutes before the


Bad fan switch. It may also be called a fan limit switch. If your furnace is less than 5 years old, the switch is part of the circuit board and you will need to replace the board.

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1 Answer

Igniter kicks the burners on, but about the time the main fan turns on, the burners blow back out. blowing cold air out as a result. plz help!!!


From what you are saying, I would bet you have acrack in the heat exchanger.See if you can watch the burner when the fan comes on. You should see the flame blow out and either move away from the flame sensor or onto a a rollout switch. I'm afraid the only remedy is to replace the heat exchanger or the furnace, depending on the age of the furnace.

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I would start by sanding the flame sensor. It will be located in the path of the flame.

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Make sure a back draft in the flue is not happening. Wind can blow it out until the flue heats up. The flame sensor may not be close enough to the burner flame. It may be weak and need to be replaced or if its an optical one it may be dirty and not see the flame very well. Its not wasting much gas but it puts extra wear and tear on the gas controls, is noisy, and, as you said, blows cold drafty air. A gas control system that has issues of any kind is not real safe. It needs to get fixed.

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