Question about Ruud UAKA037 Air Conditioner

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Unit will not start up. Switch thermostat to cool on and heat, checked temp. Nothing comes on.

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Check your breaker first always. if you have power to unit and still nothing bad thermostat.

Posted on May 19, 2011

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1 Answer

Thermostat does not reach programmed temperature


Have you checked with a thermometer to see if the area is reaching the temp you have it set at? A thermostat has nothing to do with the temp in your house. If you have it set at a temp for Example ( 72 ) and it is not reaching that temp to shut off then you have a problem with your unit or insulation in house. If you set stat on cool at 72 and the house gets down lower than 72 then there is a problem with stat.

Dec 19, 2014 | Honeywell CT500 Digital Heat / Cool Manual...

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My Dometic digital thermostat wont go up past 32 degrees. What could be wrong?


indicates inside sensor defective or not communicating resulting in a/c being locked out.

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My unit to my house wont turn on outside. This happened last night at about 8:30. I have checked the circuit breaker/fuses and the little red switch on the unit itself-- I pushed that. I turned the...


Turn power off to indoor unit. Remove red, yellow and green wires from tstat and wire nut the three together. Turn power to indoor unit back on. This should bring on indoor fan and outdoor conpressor and fan. Let me know

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1 Answer

Cool air comes out when the heat turns on. When I switch to Em heat, warm air comes out. Over the summer the air worker great, however when I switched to heat on the thermostat, cool air came out. Why?


Check the following. 1. Your setting temp must be higher +3 than room temp. 2. Check heating sensor.3. And also heater element.(If it's reversal valve, checke RV is working)

Dec 12, 2010 | Weather King 10AJA3601AH Air Conditioner

1 Answer

I don't know what the hold temp means on my honeywell thermostat


1. You didn't indicate what model of thermostat you have.
2. Hold function on a thermostat with scheduling would mean to hold it at the manual setpoint indefinitely, in other words not following the schedule. 3. I assume the temps you're trying to achieve are C If you have a heat-off-cool switch, I assume it is on the cool position. Most of the honneywell thermostats with a digital display, will indicate a little flame icon when the thermostat is calling for heat, and a littel asterik (snowflake) when calling for cooling. If you don't see the asterik, then you may have a thermostat problem. Have you checked to see if your furnace (air handler) is running? Have you checked to see if your condensing unit outside is running? If they are running, then you have a refrigeration issue.

Jul 07, 2010 | Honeywell Heat/Cool Thermostat

1 Answer

Buzzing sound when aux heat comes on


Sounds like it could be a effiency function to warn you that the heat elements are on. Check your thermostat manual and see if you can turn this feature off. If this is not a feature then the thermostat may be wired wrong or something in the circuit may be trying to short out.

Jan 04, 2010 | Honeywell Electronic Programmable...

1 Answer

A/C unit will not shut off


pls the connection of the thermostat is
C- COMMON
R- LINE
G - FAN
Y - COOL (compressr contactor)
W- HEAT ( heater contactor)
after you check the voltage 24 v between r and c slect cool then set thermostat at low temp the fan will start after the compressor will start

Apr 27, 2009 | Heating & Cooling

2 Answers

My air handler comes on ,not the outside unit when my thermostat is in the off position even if i turn the thermostat down to 50 and have it turned off the air handler comes on for about 5 to 10 minutes...


If you have a standard thermostat the fan switch is for the air handler only. It completely over rides the thermostat for most settings. Now lets see this is what I'd expect:
fan switch on Indoor fan runs all time
Fan switch auto Indoor fan only runs when thermostat is set to cool or heat and the thermostat is turned up above room temp for heat or below room temp for cooling. In both of these modes the furnace blower comes on and stays on til the room temperature is satisfied. The outdoor unit only comes on for AC the out door unit will not come on for heat or the "on" setting on the thermostat. See exception 1 & 2 below...

Exception 1- (in a heat pump the out door unit runs in both heat and cool mode unless it has emergency heat turned on then it will not come on outside in the heat mode, and depending on the type of heat pump and furnace or air handler it is). A heat pump thermostat usually has "backup heat" and an "emergency heat" setting switch on the thermostat.
Exception 2 - On some thermostats they are made to cycle on the heat if the temperature reaches a preset temp (around 50'f usually but definitely by 40'f). This mode prevents freezing when if instance the homeowner is away or while the home is under construction. In this mode the fan inside can run but the heat usually comes on with it.
Exception3 - On some electric furnaces the heating strips may be individually controlled and thus not all come on at one time. This may give the feel of no heat especially if the room is cold.

Now there may be other exceptions but Ive tried to give you a heads up on some of the most common ones.
If you need more help please post more specifics about your unit/system as to for sure what switches are set to what setting and what is happening with each. My first though was that maybe your system is OK and you needed to know if the thermostat was working properly.

If this helpd you understand your problem would you please give me as hifgh a mark as you can. Thnaks for using fixya and good luck.

Mar 28, 2009 | Carrier Heating & Cooling

1 Answer

No cool air. Thermostat AUX light turned on


I suggest you call a qualified service repair man. There are as many ways to connect a heat pump as there are people doing them. Nothing is standard industry wide that has anything to do directly with color codes, so it would be meaningless to go into them here. The terminals may be adapted to standard but but the thermostat manufacturer may not follow any terminal designations.

However you may just have an extra wire touching one of the terminals inside the thermostat. You can check this by removing the cover. Look where the wires attach to the terminal screws on the thermostat. Sometimes a new service person cuts the insulation back too far here or in the outdoor or indoor units and a "whisker" from one wire can touch the other terminals. A whisker is not the normal case try and move it away from another terminal if its is touching there. However, you may have jumpers in place especially if you have W, W1, W2... at any of the 3 sections, meaning the outdoor, indoor and thermostat.

If you can tell me the terminal designations R,Y, W1, W2, E, G, O, (B)... at the thermostat and the color thereon each, then at the indoor unit terminals or wire designations and the color there, then at the outdoor unit and the color thereon each terminal or wire designation there. I might be able to help if the above whisker check you don't find anything.:

Mar 25, 2009 | Heating & Cooling

1 Answer

Goodman PHJK048 Heat Pump Package


ok...where to start.lol ....the thermostat is just a switch.It will tell the unit to run or not run.if you measure the temp with the heatpump running,the air is warmer than 68 but it feels cool to you because your body is 98.6.The unit will run more often and for longer periods when the temperature drops outside for a few reasons.First,your house has more of a load to heat,meaning you have more heat loss because of the difference in temperatures outside and inside.Second,your heat pump pulls heat from the outside air.The colder the air outside,the less btu's for it to pull.If you have anymore questions hillbuck29@aol.com Hope this helps,Dave

Nov 10, 2008 | Goodman PHKJ048-1 Air Conditioner

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