Question about Ruud UBHC Air Conditioner

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My air handler runs but does not cut out, once it reaches the temperature set in the thermostat the external unite kicks off but the fan in the air handler does not stop running.Looking for a relay or switch that's hanging up but not sure. Please help.

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If you have old thermostat and it worked when you switched to scheduler, try reinstalling it to see if problem persists. depending how it was wired, shut off sensor may disable furnance controller (not air handler). odd thing is handler runs nonstop w/o heat which is either thermostat, control wire or controller. if old thermostat is not available, turn power off and disconnect scheduler thermostat. with wires unconnected, turn power back on. if air handler starts running, you have eliminated the thermostat as the problem.

at this point you may want to check the control wire from the thermostat to the furnace for shorts or breaks. you can temporarily run a new control wire from thermostat to furnace. turn power off and run wire as you would an extension cord along the floor up through access hole to furnace controller board. be sure to label wire colors, typically 4 wire. turn power back on. if handler starts up, you have eliminated control wire.

only thing left is control board. I would leave repairs to factory trained tech as most have limit adjustments that need to be checked in addition to solid state components which require special handling.

Posted on Apr 23, 2009

  • mithun dey
    mithun dey Apr 23, 2009

    There's a chance that the blower is stuck on through one of the heat sequencers. If that's the case, one (or more) of the heating elements is stuck on with it. If you want/need more help, check back in later.

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1 Answer

When the air condition reaches the set temperature to cut off the blower motor keeps running and i have the thermostat set to auto on the settings.


check the operators manual but you will probably find that the fan will keep running so that the air in the room is circulated past the thermostat so that the temperature can be monitored and the compressor switched on when the temp reaches the upper limit

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How do I get my blower to stop running on my ac unit


If you have a digital thermostAt see if it has a reset option.
Also loosen from wall and check for a loose connection
Check your air handler for the same( your small thermo wireset)
If there is no reset option and no loose connections
Replace your thermostat

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A/c won't stop running and no cool air


There seems to be a problem with the wiring of the thermostat. Apparently the thermostat is calling for cool (if wired properly), but is not being satisfied. The thermostat is just a switch. When there's a call for cool, the thermostat sends 24-28 volts to the contactor (inside the condensing unit to start the compressor and outdoor fan). The indoor fan is energized through the fan relay (inside the air handler). When the temperature in the conditioned space reaches the set temperature,then the thermostat cuts the power to the contactor and it stops the compressor and outdoor fan. Check that the compressor is actually running, if not, check for 24-28 volts on the wires feeding the contactor, if there is, and the contactor isn't closing then the contactor is defective. If the contactor closes and the compressor doesn't come on, check the capacitor. If the capacitor is good then check your compressor motor. I suspect you have an improperly wired thermostat

Aug 26, 2013 | Honeywell PRO 4000 5-2 Day Programmable...

1 Answer

Air handler fan cuts on runs a few minutes and then cuts although thermostat is set to off.


your thermostat could be wired in to a energy recovery venilator which will bring the unit on for a certain amount of time every hour some thermostats have recirculate mode which will do the same thing to help filter the air

Apr 16, 2013 | Goodman Heating & Cooling

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My thermostat when prgrammed and set on "auto" mode kicks on heat when temp drops below set temperature. The problem is that after warming up to that temperature...it does not shut the fan off. ...


I have a honeywell TH8320U thermostat and American standard Air handler with heating unit put in. THE thermostat works fine with the ac and follows the programs I have set. However the heat is a different story. The thermo clicks on to follow program but the unit does not run. (auto settings) If I place the thermo in heat and turn it to on I get heat?

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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

Electric furnace won't shut off


It sounds like a bad or badly miswired T-stat

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1 Answer

Electric furnace runs but won't shut off on heat setting


I would insist that Sears either have a Senior tech come out and fix it or return it to the state it was prior to them touching. Then call some one else. Have them involve the Goodman rep in your area.

Jan 20, 2009 | Goodman CLQ36AR49 Air Conditioner

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