Goodman furnace GMNT080-4 furnace runs good for a while then has to be manually reset
I have a Goodman GMNT080-4 (90%). I'm having the same problem
As Streatherg did back in the Nov 2006 question. I reviewed his article and tried
Every thing on there but seems to be doing the same thing.
The furnace kicks on for about an hour then locks out and has to be manually reset threw the thermostat or the power switch. The led light blinks 1 time and it says it could be
1. flame sensor 2. gas pressure 3. gas valve . I cleaned the flame sensor , checked the gas pressure but don't understand why the gas valve would fail if it runs fine for a while when first starting.