Trane xv95, 7 years old. Calls for heat, all looks and sounds normal but flame goes out after 3 seconds. error lights indicate system lockout/retries. all drains and exhaust appear unclogged.

SOURCE: When i turn on my

check to make sure the gas is on and the flu pipe is clear.  does the draft motor come on at all?  if not, you may have a failed control board.

SOURCE: GMP075-3 looks good but shuts off after 10 seconds

I turn on the heat on the thermostat and the unit won't stay on. The gas would ignite but the flame would immediately go out. That will continue throughout the day. Sometimes it will heat up the house, but a majority of the time it don't.

SOURCE: Burner ignites and goes out (Goodman Gas-fired furnace)

Hi,
The problem you have is water in the exhaust pipe.
Check to see if the pipe has sagged anywhere or if there is a trap in the line.
If you hear gurgling then it is definetly water....
Some times can be hard to find, even a pipe 1/4 full will cause problems. They are very sensitive to flue problems.
Make sure that the flue pipe either runs back to the furnace or out to the outside, a continuos slope either way witha high spot in the middle.
Also check the bottom drain of the blower if it has one, have had them plug and trap water also..

I hope that this will help you to solve your problem!

Thanks for using Fixya!!

Heatman101

SOURCE: tHE FURNACE COMES ON WHEN

The flame sensor or "flame rectifier" has gone bad or the wiring is cut. Replace flame sensor.

SOURCE: i have a gmh8 ---the

does the unit actually fire just not stay lite... if so then the flame sensor is the culprit..sometimes you can pull it out and lightly sand it don't go crazy because to much sanding can really cause problems... if the unit does not light then what is the sequence it goes through before failing... this unit have a hot surface ignitor i am assumming (glow plug some call it) or is it spark ignition with a module box on it... either way the sequence of operation should be a call from the thermostat made for heat, the enducer draft motor comes on (small motor with a wheel on it) then the enducer draft motor pulls a negative pressure on the pressure switch (round switch with hose attached to it) make sure hose is not kinked or broken,also pull off and check for debri in hose and in holes where it connects to... after pressure switch closes it will send power to ignitor /or spark module once glowing the gas valve should open and allow gas to enter burner orfices and fire ... once unit has lighted then the flame sensor continues to measure milivolt and send bacl to board to keep gas valve open while call for heat... if the flame sensor is dirty or faulty it will not allow the gas valve to stay open. repost with more info ///watch unit where does it fail... most goodman units have a code schematic on the door of unit or inside... should tell you what the number of flashes means if it still is there let it fail and count the number of flashes and then see what code is for that failure.... good luck to you

Testimonial: "helpful ,but not the problem ----the unit cycles three times without ignition ----then goes into fault mode-turns out the gas valve was bad "