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Goodman GMP125-5 limit switch open

I have a Goodman Furnace GMP125-5. The circuit board indicated an open limit switch (4 blinks), either main or aux. How does one check the limit switches and where are they found? How does one fix the problem?

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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.

Posted on Mar 02, 2009

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