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Rheem classic ix missing high pressure switch

I just replaced the fan motor for the condenser. i was told that to make it restart i would need to reset the high pressure witch to make it turn on.
I can push in the contact and start the unit manually. I was told it was not starting by itself because the high pressure was triggreed. I have looked all over the unit for the switch to push it back in. Any suggestions on where this switch is located?

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  • beam111365 Aug 07, 2008

    Rheem Classic 4 ton - Pressure switch is not resetting. Shuts down the outside unit fan and compressor, does not trip the breaker, but the only way to get the outside unit back on is to reset by manually flip the electrical breaker. HVAC tech has checked the freon and the pressure and checked the circuit board to determine what is causing the problem. The tech keeps telling me that the only way to determine these type of intermittent problems, and to determine if there is a real pressure problems is for him to be there to check the pressure when the unit shuts down. This unit has been doing this since it was installed. The HVAC tech has also stated that he does not know if the problems is a faulty pressure switch, problem with the outside unit fan. He suggested an automatic pressure relay switch to force the unit back on. Help!

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Inhave a rheem ac the fan trunes and the slows down and stop how can I repalce this fan

Posted on May 24, 2009

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Our Rheem Classic Air Conditioner Unit keeps tripping the reset button or something and we have to run out and trip it. Well today it won't turn back on.


What's probably happened is that your outdoor unit has overheated due to a high pressure/high temp situation. The reset button at the base of the o.d. unit is a HIGH PRESSURE RESET. This safety is factory installed to prevent the unit from operating under an excessive(per design) pressure.
•The o.d. coil needs to be cleaned
•The o.d. fan motor needs to be replaced
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I live in south texas overnight the ac stopped GOODMAN MODEL


Is the condenser fan (outside) turning? You mention that it's hot but don't say if it's turning or not.

These fan motors normally run pretty hot, but not so much that they shut down due to internal thermal overload protectors.

Both the compressor and the fan have termperature overload protectors to keep them from burning out the motor in the event of an overheated condition. The condenser fan must be running or high freon pressure will put an excessive load on the compressor and it will 'kick out' the high-temp overload protector.

Turn off the unit by pulling the outside disconnect (in a small box near the outside compressor unit) or flip the AC breakers in the breaker box. Wait about 30 minutes for the unit to cool off and turn it back on. If the compressor and fan both run for awhile then kick back off, or the fan motor seems to be working under excessive strain, you've probably got a bad motor start condenser (inside the unit) that little round can that is connected through the fan motor wiring. If it's swollen or leaking, it's almost surely defective and even if it's not, excessive load on the motor is a classic sign of a bad start condenser.

You can usually find these at electrical supply stores, well-stocked hardware stores, or most certainly at an HVAC parts house. Be sure to replace the old one with one of the EXACT same value (in voltage and Microfarads (mF) capacity. The shape may be a little different, but as long as the electrical characteristics are the same and is rated at the same or higher voltage than the original, it will work.

Connect the new condenser, mount it to the frame, and restart the unit. This should take care of the problem.

Hope this helps.

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