Question about Ruud UBHC Air Conditioner

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Condenser outside Aight,,, so i finally got power to it outstide,, now, to get it to work i had to bypass some wires,,,, from thermostat to furnace and then to outside we wind up with red and white wires.... both hace power,,, now,,, the white connects to and follows a blue wire.... blue wire goes down and inside this white tube lookin thing... this thing is attatched to copper pipe,,, another or possibly same wire comes out,,, thats where the power stops and fail to turn the motor on,,, what is that thing and is it replaceable,,,,???

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You could br=e low on r-22. sounds like the thing is a pressure switch

Posted on Jun 11, 2008

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Ruud AC unit outside won't start, furnace and blower inside work.


It sounds like your at the point where you need an electrical meter to check out the problem. Make sure you have the proper voltage to the outdoor unit. Could be a bad contactor in the outdoor unit

Mar 01, 2017 | Ruud Heating & Cooling

1 Answer

Power up unit and thermostat, circuit board and gas valve smokes. checked transformer and its output is 24vac. this happened after a thunderstorm. blower works manually from furnace but not @ thermostat....


You have a short circuit, which is obviously dangerous. Your blower motor is controlled via a 24VAC control circuit, but is 120VAC. The circuit board and gas valve are probably history, but it needs to be troubleshot to determine the scope of the damage.If you remove T stat you will see several colored wires. The red and green wire when touched together should cause your fan blower to run. If that works when you bypass t stat the t stat is gone. The red to white will open your gas valve on your heater. The red to the yellow or blue will start your AC compressor or condenser fan motor. Be careful with the yellow and blue wires as one is actually a neutral and one goes to the AC contractor on your condenser unit contractor. Hope this helps!

Aug 02, 2011 | Heating & Cooling

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From the Isolator panel, how do I connect the condenser, and the blower?


MOST UNITS NOT HEAT PUMPS  WIRE UP WITH 2 WIRES TO CONDENSER RED WIRE AND WHITE . WHITE GOES TO COMMON C ON FURNACE AND RED TO Y TERMINAL OF FURNACE Y ALSO GOES TO Y ON TSTAT. BOTH YELLOW WIRES MUST MEET AT Y OF FURNACE.  WHITE FROM STAT TO W   GREEN FROM TSTAT TO G AT FURNACE IF YOU HAVE C ON TSTAT HOOK UP BROWN WIRE OR BLUE FROM COMMON TERMINAL WHERE YOU HOOKED UP CONDENSER WHITE WIRE AT FURNACE TO TSTAT , MOST THERMOSTATS DONT NEED C RUN FROM FURNACE. THE TWO WIRES GOING TO CONDENSER IS -  AND + TO ACTAVATE CONTACTOR IN OUTSIDE UNIT

Apr 19, 2010 | Ruud Central System Air Conditioner

1 Answer

I am trying to install a RTH2310 but I do not know where the wires go. Brother in law took old Thermostat off and did not write down where they go. I have a white wire, a red wire and a green wire. Back at...


In most cases, the wires are used as this: Red=Power, White=Heat, Green=Fan/Blower Motor, Yellow=A/C. The other wires, like the one hooked to the yellow will be the condenser wires going outside. The thing I'm not sure on, is that Honeywell Thermostats usually have the terminals marked with R,W,B,G,etc. If it does, then the wires will be as color coded and just hook them back up that way. You can also test to see if those wires are what they are supposed to be by jumping the wires. You can start with red since that is supposed to be your 24v power. Jumper red and green, you should get the blower motor on, jumper the red and white, you should get the heat to come on. Same goes for a/c as explained above. Any other questions, I will be glad to help.

Jan 23, 2010 | Honeywell Focus 6300B 5-2 Days...

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Relay not engaging


This solution is based on a non-heat pump split system (furnace inside and condensing unit outside). The relay takes 24vac to energize and pull in closing the high voltage circuit to the compressor and condenser fan. If 24vac is present at the coil (two side terminals with smaller wire) and the relay does not pull in you need a new one. If no 24v is present then the outside unit is not getting the signal from the furnace and thermostat. If you pop off the furnace covers and access the control board your wires that go outside land on terminals C and Y. Y should have two wires, one from the thermostat and and the second goes to the outside unit. Test for 24v between C and Y. You must bypass the safety switch on the door prior to testing because that switch will cut off the power to the furnace. If nothing then you have a thermostat problem. If voltage is present you have a wiring issue between the furnace and outside unit.

Jul 11, 2009 | Heating & Cooling

2 Answers

I have a DuoTherm BriskAIr 13.5K BTU. The Dometic thermostat also controls my HydroFlame 8531-IV furnace. This morning, the furnace would not come on. I checked the wiring and there is no voltage at the...


If you look at control box at roof unit, they usually use a separate set of wires for furnace. See what colors they are attached to at harness to thermostat. Some just follow other harness, and come out at thermostat. (bypass control box) Once you've determined which 2 they are, join them together & see if furnace starts, as it should. If it does, thermostat is faulty. If not, pull outside cover off & check voltages at furnace. I'm guessing by furnace model that your unit is approx 30 ft , but if it's a park model, you may have 24 volt system on furnace or 12 volt. Another way of confirming is to go to back of furnace where air intake grille is inside your unit, and locate 2 blue wires going to furnace & remove whatever wires are attached to them & connect them together. Furnace should start up.

Jul 08, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Goodman GMP75... keeps blowing fuses only in A/C mode. Only when I connect yellow wire from thermostat to line going to condenser contactor (24V side).


Are you talking about the small 3 or 5 amp fuse in the furnace? If you are then the control voltage circuit to the condenser is shorted, Maybe dogs or rodents chewing it or the insulation is cut by a sharp piece of metal. Sometimes the contactor will go bad and cause the small fuse in furnace to blow. Look for the simple things first, like control wires shorted. Make sure the yellow wire from the thermostat goes to the outside unit and not to the common.

Jun 30, 2009 | Goodman GMS90703BXA Heater

1 Answer

Carrier air conditioner cycles on and off


The compressor/condenser is being called all the time. The reason it goes off is because the evaporator (indoors) freezes up when the fan is told to turn off by the thermostat. This further cooling lowers the low side pressure below the low limit switch point turning off the compressor unit.
Solution: Make sure the thermostat is wired correctly. Green wire is usually the compressor wire but maybe not.

Jun 17, 2009 | Carrier 38BRC036 Air Conditioner

2 Answers

Problems with low voltage control wiring turning on cond. unit


Only 2 wires going outside.
Yellow from the thermostat and the common wire from the lv side of the transformer.

Apr 28, 2009 | Heating & Cooling

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