Gas furnace runs too long

SOURCE: 1993 goodman status light 4 times blinking

I have a goodman GMP075-3 that won't turn on. I think it is the pressure switch since I do not have a vent blockage. What is a venter and where can I find it??

SOURCE: goodman model 135-5 furnace fan and induce motor

Is there a thermal Fan/Limit switch in this furnace? If so you may need to tweak the low range setting so it can turn off the blower.

SOURCE: New Trane XV95 furnace runs and stops nine

if it is a mechanical thermostat the heat ant. does that on cheaper digital tstats it is set by span and on better stats like honeywell model 5000,6000,8000 series you set the cycle rate. what kind and model number is tstat

SOURCE: furnace will not shut off after the setting is

Check if your thermostat is set on 'o fan' setting.
If it is, trey to set it on 'Auto-fan' instead.
since it seem as if the heating does go off,only the fan may be running continuously.
this is possible if the thermostat is incorrectly set or installed.
good luck.

SOURCE: red led blinking three times,

check flame sencor is clean or loose connection , or it could be the pressure switch try jumping it out and see if it stays on ,