The error codes, blinking red twice, should be described on the electrical diagram which is probably on the back of the panel you had to remove to see the circuit board. If not there, check the manual, which you can probably download.
The diagram states two blinking lights is end switch open
its says check the venter end switch but im not sure where that is
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SOURCE: Goodman GMS90904CXA Wont ignite, light blinks 3 times
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.
SOURCE: Payne Gas Pack Furnace A/C and Heat Unit
Do you have power to the unit?
Is it a 110v or a 220v unit?
check your power supply.
SOURCE: Goodman GMP125-5 limit switch open
There may be as many as 6 limit switches on the furnace. The first thing to do is turn off the power to the furnace. Look around the burner box. You will see possibly 3 small maybe brown plastic swithes with two wires to each and a button between the wires. Press the button on each one. If it clicks that's the one tripped. There may also be the same kind of switch(s) in the blower compartment. There's a self resetting limit on the middle of the furnace it also has two wires but looks like a black or dark brown plate about 2 1/2 X 3 1/2 inches. You have to check that one with an ohm meter. If any of these switches are tripped there is a reason. Check your filter and overall air flow. with low airflow the furnace may overheat. The switches around the burner box are roll out switches. Watch to see if flames are coming out of the burner area. especially when the blower comes on. DO NOT bypass any of these switches. Call a certified tech. to check it out.
SOURCE: My furnace, Goodman CAPF030B2C, isn't putting out
Yes, the roll out switch is located near the burners and has two wires leading to it. It is about the size of a dime or penny. There is a small reset button between the two wires that you press to reset it. Sometimes you need to press a little hard to get it to reset. If the unit trips it again, and you don't see the flame "licking" out from the firebox and no evidence of soot in the area, it's a bad limit and needs to be changed but if you see even a little bit of flame leaving the fire box, shut down the unit immediately!!!! You are in danger of a fire and carbon monoxide poisoning!
SOURCE: Goodman forced air gas furnace not firing
if your power vent moter is not running you should not have have glowing ignitor.Frist the vent moter must close an air prove switch in series with the idnitor .seems you have a stuck air prove switch.Its the one with a hose attached
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