Question about Ruud UPMC036 Air Conditioner

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Unit does not heat or cool. Starts to operate if I spin the fan. Failure appears to be caused by the starting capacitor. However, there are two capacitors one with two leads and one with several. The two lead capacitor is connected to a relay. Which capacitor is suspect bad?

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Look at the top of the capacitor that has several leads to see if it is a dual cap. It will have 3 sets of connectors in a row and if you look close, they will be numbered with these markings, C for common, Fan, for the outdoor fan motor, and Herm, for the compressor. This would be the one. Look it over to see if the top on either one is raised up, swollen looking, leaking oil or deformed in any way. If so, the cap is faulty. It may just be your motor going out. This motor gets a lot of run time in the summer, and if its a heat pump, the winter also. If it tries to take off when you spin it, sounds like the windings are weak. But, it would be much cheaper if it was the capacitor. If you are going to have it tested for the proper microfareds/uf's, make your self a drawing of all of the wires and where they go, so you don't forget. This happens a lot. The capacitor will have markings like this on the side. 55ufx370 volts or 440 volts and the fan will be 5uf's x 370 volts or the numbers may be higher or lower depending on the tonnage of your unit, just to give you an idea. Please keep me posted and get back to me and let me know what you are able to find out. I will be here if you need my help. Don't forget to rate me as I know you will be kind. Keep me posted for sure. Thank you,
A/C, Heating Contractor

Posted on Sep 09, 2010

Testimonial: "Great sugestions and write-up!"

  • ottobahn Sep 09, 2010

    When I entered the unit info I attempted to change the model to UPMC-042 but apparently it didn't take. I just found the schematic for the air conditioner and it shows the start capacitor, run capacitor, and start relay. When I spin the fan (just barely moving it,) the heat pump starts and operates as required until the desired temperature is reached. I inspected the start capacitor and it visually looks ok. It's a 88 - 106 mfd 330 volt cap. I'm going to replace it to see if it corrects the problem. Because the unit operates as it should when I spin the fan I'm thinking the cause is either a bad start cap or relay. Your information was very helpful. I hadn't considered the operational time of a fan during the winter and summer. I have no way of checking the cap so I'll try replacing the least expensive part first. Thanks for your help!

  • Robert Horton
    Robert Horton Sep 09, 2010

    Thank you for the awesome rating, and I am happy I could give you a place to start. Its best to take the capacitor in to a appliance retail parts house and they will test it for you. It does sound like it may be the run cap for the fan now that I know you don't have a dual capacitor and the fan will run after you spin it to get it going. I am pretty sure you will get away with a new cap. They are around $14 to $20 dollars, so I wish you the best.



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Replace processor fan.

Computer case open, observe the Processor fan as soon as you start the computer.
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Observe if the fan spins slowly, or spins for a while, stops, then spins again.

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This link gives information about what Electrolytic Capacitors look like installed on a motherboard, and photos plus info, about the visual signs of Electrolytic Capacitor failure,

(Computer unplugged from power. Observe Anti-Static Guidelines. Need more info about the last sentence, please post in a Comment)

Requires either replacing the failing capacitors, or replace the motherboard if bad capacitors are found.

If upon a close scrutiny with a flashlight, and magnifying glass, does not reveal visual signs of capacitor failure, then the next hardware component to check is the Power Supply.

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Electrolytic Capacitors are used as Filters in a computer power supply.
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An economical multimeter can be purchased for around $10 to $15 at many stores. An auto parts store usually carries them.
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This is an example of a power supply tester,

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