I have a 2 year old Goodman GMV950704CXBB Natural gas furnace. In the morning when the thermostat calls for heat, going from 68 to 73 degrees, the furnace will start, run great until the temp reaches about 71 degrees, then it shutdowns and goes into Lockout mode because it can't restart. I just replaced the igniter and it didn't help. I had a tech check out all the switches and they are operating with in normal limits. I think the system is struggling to drain the condensation, my hoses are clear and have a good path to the drain bowl. I wait an hour or so, reset the power and it starts up again,,,, This seems to only happen when I run the unit for a extended length of time.. Say 1.25 hours or longer. Any ideas? Thank You.

SOURCE: Ignition failure after three attempts then sits for an hour.

If your igniter comes on but no ignition, that eliminates the possibility of a bad or clogged pressure switch, high limit or flame rollout switch. Sounds to me like you have a control board, or a gas valve going bad. Could even be some loose, corroded, or faulty wiring. Before the igniter comes on the furnace does a self diagnostics to ensure everything is working, or the furnace will not make it to the igniter sequence. Inducer motor, pressure switch/s, limit controls are closed…then comes on the ignitier, gas valve opens, pilot runners and burners ignite, flame sensor detects the flame, blower comes on and all operations are working.

Hope this helps

SOURCE: Main Fan won't turn off even with thermostat removed. Burner not

There is a chart with the wiring diagram and othere charts that will tell you what the 6 blinks are for. That should tell you what is wrong and what part you need. Sounds to me like the board has an issue or the gas valve is locked out.

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: Goodman GS9 propane furnace inducer motor runs continuously

it sounds like the low temp limit switch, the one that cools the furnace down with the burner off and the thermostat open, when it cools to a point the fan stops, the other switch in burner area turns burner off/on, hope this helps

SOURCE: Furnace blower fan problem

Hi check out the fan control switch could be dirty itsounds like this is nit cutting to let fan run also check setting fan off fan on , temp rise and fall