Question about Ruud UBHC Air Conditioner
Noticed heat wasn't working this evening. Checked breaker, everything was fine. Thermostat reading correctly. Changed it from Heat to AC, no change, only a quiet click from the thermostat. Set the thermostat control for the fan to On, nothing but a click. Checked outside and the fan outside isn't running. Any ideas or suggestions???
Sounds like there is no control voltage. Either the transformer to reduce the voltage from 110 volts to 24 volts is not producing the 24 volts needed for control voltage, or most furnaces have a small 3 or 5 amp fuse mounted on the main control circuit board that may be blown. Other "outside circumstances" may involve a break in the thermostat wire...more than likely the red wire if you are getting nothing to work. I have seen evidence of "critters" that have chewed through the low voltage thermostat wiring that would keep the thermostat from controlling anything. To check this, go to the furnace and jumper the red & green wire to get the fan running just to isolate if it is a thermostat wiring severred. Good Luck.
Posted on Dec 13, 2014
Some a/c units have a door switch. If the service door or cover is removed, it will deactivate the unit. Sometimes this switch will not make contact, become temperamental or door is not installed correctly. If it has this feature, you will need to push it in manually or bypass it, or replace it if bad.
Posted on Apr 28, 2015
Check the breakers and the switch at the top of stairs to see if someone shut off by mistake
Posted on Dec 11, 2014
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Posted on Jan 02, 2017
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
Sounds like the compressor starting relay or capacitor is defective. When the compressor could not start, the electric heat came on to satisfy the heat requirement and causing the emergency heat light to come on at the thermostat. This light warns you that electric heaters are energized. And they use a LOT of electricity! Call a different company for service. And do it soon.
Posted on Nov 16, 2008
Check t-stat and make sure fan is set to "Auto", that might be why fan is running all the time, or it could be a fan relay that is stuck closed. It sounds like you A/C is over charged or you have a bad high pressure switch, this was a common problem with this manufacture especially in the heat mode.
Posted on Apr 25, 2009
Definately get this checked out. Some thing has shorted just enough to let voltage "Feed back" and keep the fan running. Could be capacitor, wires rubbed through each other, etc. A reset is a safety that is used when there is an overcurrent or over pressure situation. No reset set for this situation.
There is always an outside chance that if you touch the unit while standing on wet ground, you may get shocked. I firmly believe that something is allowing power to the fan in a feedback condition so don't let this go as it may cause damage to other parts.
Good Luck and let me know how you make out on this.
Posted on May 11, 2009
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