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celada2002
Oct 3, 2011, 04:54 PM
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

JonesHVAC
Oct 11, 2011, 06:02 PM
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.