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Goodman GMS90904CXA Wont ignite, light blinks 3 times

I just flipped thermostat switch to heat and reset the weekly settings, with thermostat on auto, the fan comes on but the furnace doesn't ignite. I checked the furnace ,the light was blinking 3 times.I did a shutdown and startup procedure but still have the same results. Goodman heater with 3 blinks which says pressure switch/vent. I replaced the pressure switch and still works only once every few days. After it stays off 1-2 days it will work till it reaches the temp on the thermostat but once it shuts off it will have to sit again. Unit is about 5 yrs old. Checked the vent, the hose and its good. Can anyone help me please.

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I had the same problem, I had to remove the lower black rubber stopper right next to the exaust fan and hook up a drain to the unit, as soon as the water drained out the furnace fired right up.

Posted on Dec 11, 2008

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