both my next-door friend and I have installed the Goodman GMV950905DX two-stage variable speed furnaces. We now have the same problem both of us.
If I crank the temp up by 3-4 degrees GMV950905DX will turn on the second stage for 10-15 mins, but GMV950905DX will shut off the furnace without reaching the desired temp while call for heat remains on the t-stat, red light on the control board blinks when furnace stops (can see it through the window). It will turn itself on in 15-20 mins again. Feels like it overheats, cools down and then turns back on.
The same contractor that did both jobs is quite puzzled and he says he never saw it on Goodman GMV950905DX and he installed quite a few. He is suggesting that exhaust blower motor is shot and causes this behavior but problem is that it is very unlikely that both furnaces have bad motors.
Asking good folks here for suggestions on what that could be.
Thanks in advance.