Hello,

My Goodman Gas Furnace is giving me a code 3! It starts and lights up for around 1:30 and then turns off the flame for another 1:00 or 2:00 and the red light blinks 3 time and comes back on. I check the pipes and found no obtrusion. Check Ignitor and it lid the burners, I sucked and blowed on the pressure switch and it seen to work fine opening and closing. I cleaned the flame sensor SHUT what else I can check or do? I'm pretty sure there is something simple to fix!

Any Assistance will be of great Help and It will be well appreciated.

USA,SFC

3 blinks for that furnace is just a delay for re-ignition due to the flames going out. It actually points to the pressure switch. Your getting intermittent flame though and in most cases it is due to a dirty or faulty flame sensor... seeing as how you said you cleaned it the first thing I will ask is how you cleaned it? You should use a fine grade sand paper. If that still doesn't work then you will need to get a multimeter so you can check voltages. You should be getting between 24-28 volts constant to the gas valve under normal operation (while flames are on). POst back from there please. Thank you.