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Flame on furnace lights for about 30 seconds then goes out but blower still blows

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Inside your furnace their are two probes one is inthe shape of a paper clip the other is a straight probe this one needs to be taken out and cleaned using emery cloth be sure not to touch this probe after cleaning or you will have to replace

Posted on Oct 21, 2008

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Posted on Jan 02, 2017

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Ruud achiever 90 plus gas furnace flame goes out after few seconds


This could be water in the hoses that connect to the pressure switch , they should just pull off and blow then out also blow out the pressure switch , this sound like a moisture problem with all the bad weather you h, check air filter is not blocked .

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Furnace continues to short cycle over and over and over...


It could be two things flame sencor needs cleaning of conections not tight or the pressure switch is not working try jumping it out and see if it lights

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I have a goodman gpmn furnace. The ignitor lights, and then the flames turn on, then the blower kicks on, and about 30 seconds later the flames turn off, and the blower continues to blow air. We have tried...


Hello, looks like you limit switch keeps opening because your furnace is overheating, Check your air filter and blower wheel to make sure it is not dirty and make sure you blower motor is moving at the proper speeed. Usually when air flow is cutoff the limit switch will open.

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I have a newer tappan heater and get 4 blinks on led for error code the unit starts up fine and has flame but flame goes off when blower kicks on


Problem: Your furnace will not ignite the gas to produce heat for your home. When a furnace has a bad ignitor what I see most of the time is the following sequence of operation:


1. Thermostat calls for heat. 2. Draft inducer motor starts. 3. Pressure switch attached by a small plastic or rubber tube senses the negative pressure produced by the draft inducer and closes. 4. Draft inducer runs for 30 seconds to a minute before you hear a gas hissing sound. The ignitor did not glow, the flame sensor (a small metal probe about 1/8" in diameter, with a white porcelain base) does not sense the flame, so after 8 to 10 seconds the hissing sounds stops with no ignition of gas to heat your home. Your furnace shuts down and goes into a lock out condition until you turn your power switch back off and on again. Then the sequence starts all over again with no ignition of the gas. Solution: You probably need to purchase and install a new ignitor. I would suggest that you inspect your ignitor closely for cracks. Make sure you do not touch the ignitor with your bare hands. If you do not visually see a crack, then you could have a furnace control board problem or a limit, rollout switch problem. The furnace's control board might not be supplying the voltage to the ignitor. If your furnace lights and the gas stays on for 8 to 10 seconds, then shuts right back off, then you need to clean your flame sensor with light sand paper or steel wool. You might need a new flame sensor, but most of the time they can be cleaned an will work well after cleaning.

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I have a York Diamond 90 furnace and when i try to start it, the pilot light goes on then it shoots the flame into the furance, but will shut down a minute or so after that. It sounds like the blower is...


The furnace is not sensing the flame. Turn off the power.
There is a metal rod in front of the last burner to light. It is corroded and needs to be cleaned. Its the flame sensor .
take the 1 screw out holding it in to the bar and scrub it with some steel wool till shiny. replace and turn on furnace. all should be fine.

Mar 30, 2010 | York Furnace Draft Inducer Blower Fasco #...

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

I have a coleman propane furnace in my home that is 30 yrs old. you can light the pilot but when you turn up the thermostat so that the burner will light and the fan will blow the pilot goes out after a...


watch your flame on the burners and see if the flame changes when the blower starts if it does and makes the flame jump around you have a busted heat exchanger

Nov 22, 2008 | Heating & Cooling

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