Question about Ruud UBHC Air Conditioner

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Ruud ubhc-17j11sfd the outside unit wont come on for AC. I checked the breakers in the main breaker panel for the house. The fan inside works.

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Rene J Solis

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Did you check if the outside fan is working?? On the summer time the failure of condenser fan motors increases due to hi temps.
Have somebody turn unit on as usual while outside you check if condenser fan is turning and if the compressor kicks in. If the fan motor do not work, the compressor will shut of to prevent damage..
If either one of them tries to start but can't take off, replace starting capacitor, some units have separate capacitors and some have combo capacitors, they work the same.
If after replacing the capacitor the fan motor still don't want to start up, replace motor. If Compressor do not want to start, call a HVAC Technician to perform further testing.
Good Day!! Don't forget to rate this post!!

Posted on Aug 13, 2010

  • Anonymous Oct 07, 2010

    r and y only call for cooling at the stat and internal board. The contractor is energized by common and y, and if its a heat pump other than Rheem or Ruud (which are cooling bias) it should energize your reversing valve with o when calling for cooling as well.




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To add to your possible solution. If you do not here the fan kick on and you also dont here the compressor try to kick on. You may not be getting power to the contactor relay or through the relay. Test with voltmeter and be very carefull for high voltage. If you have power to/an through contactor when contactor is manually actuated then you may have a bad wire to the T-Stat. Check the low voltage wire to the T-Stat for connection loose or broken or cut wires. R to Y in the T-Stat is the call for cooling! They engage the outdoor contactor with 24v to create a magnetic field that pulls the contactor blades in to pass the 240v to the capacitor and onto the compressor! Goodluck! Be safe!

Posted on Aug 22, 2010



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Assuming you don't have a the tools that a tech is going to have ill give you the easy way to do this. First take the panel off the outdoor unit to access the controls, capacitor and contractor, (make sure you have cut power to the device you are working on first by pulling the disconnect and shutting off the indoor breaker). After you can see the electronics in the panel and observe no visible damage (swollen Capacitor, Leaking fluid from capacitor, arc burns on contractor, etc.) restore power now be careful and make sure the indoor fan is running and set for cooling, Press the plastic plugger in the middle of the contractor. - if it hums/buzzes its almost always your capacitor- if it runs then your machine is not calling, check your stat and ceiling saver/ wet or float switches-

(if its your capacitor (Inside or Out) and you can clearly read the size go to your local supply house and get one but know this capacitors fail normally cause the motors are stressed or dying, often capacitors fail as effect from refrigerant issues such as a dirty coil inside or out, undersized ductwork. Dual capacitors found only in your outdoor equipment fail when charge is off even if coils and airflow are good, due to either excessive runtime {low charge, leaking or undercharged} motor stress {overcharged system can stress the compressor motor}

(your Rheem came stock with a dual capacitor it will look like a cylinder with 3 little hats on top each has contacts with spaded wires attached )
IF you don't do this as a professional you should know you can cost yourself more money by to fix you machine then you would calling some one in the first place should you not catch all the contributing issues.

Posted on Oct 01, 2010

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SOURCE: Ruud heat pump outside unit trips circuit breaker

Check your wiring between the contactor and compressor for a short to ground, or check the compressor windings for short to ground.
With the Tstat off, the contactor should be open so the only way for the compressor to be trying to do anything is if the 110 volts from the unbroken side are traveling through the compressor to ground. Since 110v is not enough to run it, the overload is kicking it out, cooling off, and repeating the cycle. When you kick on the Tstat, the contactor is supplying voltage directly to ground without going through the resistence of the compressor windings and kicking the breaker.
Post back and let me know what you find.

Posted on Nov 20, 2007


  • 4 Answers

SOURCE: ruud ac wont come on. mfg 03/99. thermostat

Have an electrician check the connections in your panel, this sounds like a loose/bad nuetral connection

Posted on Jul 27, 2009


  • 1033 Answers

SOURCE: I have a ruud ubhc-17j11sfd

Hello, if the airflow seems good and the unit is clean it is possible that the unit has a low refrigerant charge due to a leak, if you have a thermometer measure the return air and the supply air, tjen find the differance between the two, if it is below 15 then the unit is undercharged and will neec to be recharged.

Posted on Jun 16, 2011

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