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You most likely have a bad fan limit / cycling switch. If you kill the power to the furnace see if you can trace the wires from the motor to where the connect to the switch. It looks like a round button with tabs sticking out of it for the wires to connect. Mark down where the wires were connected and take it to a HVAC business or furnace supply house. Be sure to have the model off the furnace with you so you can get the correct parts.
Most probably its weak motor.When the motor gets weak it trips/ stops on high setting.On high setting motor needs more power to run the fan.Try lubricate the motor .You may need a few drops of oil on the fan motor bearings. As they get older they get dry and gunked up. If you can see the bearings a few drops of oil may help. --------- Because the fan operates on medium and high, so loose wire or faulty fan switch is very rare to cause this problem.--------As per the problem , it requires motor to be replaced.---------This will help.Thanks.Helpmech.
You're pressure switch is open. The sequence of operation starts with the inducer motor and it pressurizes the combustion chamber, and also closes the pressure switch before the burners will come on or before the ignitor will work. Check for a hole in the vent poly hose, you can remove it from the motor end and blow through it and this will most of the time free up the single contact and it will fire up. You can also by pass the switch with a jumper wire if it is bad or stuck and it will fire, Then you will know what to replace, or what the problem is. Very simple for you to do. Good Luck, and please rate my help to you, Thank you. Shastalaker7 A/C, & Heating Contractor
This is a safty limit switch. Find two wires that are going to the inducer or combustion blower that terminates to a small disk about the size of a penny. In the middle of those two wires should be a small button. Push firmly down thus reseting the switch. This should do it. It could also be the pressure switch but I have never heard it called that before. If the first doesn't fix the issue. Remove the small tube that runs from the inducer to a black or silver disk, blow out and draw in air until you hear clicking noises. Sometimes they can become stuck. If that doesn't work, remove the other end of the tube from the pressure switch and blow through it. Sometimes debris can clog the entrance to the pressure switch as well. Hopefully this will solve your problem. You can have a bad limit or a bad pressure switch. In this case you will probably have to call someone out.
The power ventor most likely needs to be replaced. But be advised. Goodman normally will not sell parts to anyone but a certified technician. I had to show my masters certificate to buy parts from their outlet. This is a part that has a high rate of failure.