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AC thermostat does not control AC. AC runs continuously. Have to shut system off to stop AC.

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Are you using the old coventional thermostat? using mercury

or was it digital?

chances are the reason it is not stopping because it can not detect the right temp inside your house, if you have set this for example 74F AC would run continouisly until it reaches that right temp, until that time, it would surely not stop,

check for any windows, door that might cause some air leaks inside your house for a start, close all exhaust fan and see if you can see any difference, if not this might be the right time to change for a digital temp control, it not that expensive and easy to install

Posted on Jul 25, 2008

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Ac unit runs, inside blower shuts off after 2 mins, compressor continues to run, t-stat still calling for cool


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AC Condenser motor will stop at 1pm but inside unit is still running but no AC. If I turn the AC unit breaker unit off and then an hour later turn it back on. The unit runs fine all day until 1pm. Had a...


Hi, the tech should have been able to figure the stat out with out a manual to see why the condenser is shutting off at 1:00 P.M. This is unusual for this to happen, unless it was winter and this is a heat-pump going into defrost, but just the fan would shut down. Does this unit have a box on it that was installed by your electric company that shuts the unit off during high peak conditions in the summer? This would cause it to shut down at the same time everyday. If not, it would have to be something in the thermostat that is set for it to shut off at that time. It still does not make since, as it would shut both the indoor and outdoor unit off, not just the condenser. Are you saying that just the condenser fan motor is shutting off, but the compressor continues to run until it shuts off on high head pressure when the fan stops, or does the complete outdoor unit shut down fan, compressor and all at that time??. It sounds to me like this outdoor unit has a time delay relay that has a fault in it may be shutting it off at this time daily? Please let me know if its just the condenser fan motor that shuts off, or if the complete unit is shutting off all together, this will help .
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1 Answer

I changed the thermostat and then the ac stopped working


if this is a split system, go to the furnace or air handler. Shut off the power, remove blower door and find where thermostat wires go to control module.

Remove thermostat wires writing down where each one goes. Make a jumper wire and install it between r and y or r and y1.Put everything back together and turn on power. IF blower motor and ac start, you have
a low voltage wiring or thermostat problem.

If nothing happens then you either have no power to furnace, transformer
could be bad or you have blown a little 3amp automotive fuse that is
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1 Answer

I've a Bryant AC/Heat system. Model 661CJ030-A. It run cool okay but the fan kept to running even get to the point that has been set.The system seemed not auto stop. Any ideas,


Hi if the indoor fan continues to run after the unit is done cooling, you either have a fan relay located in the indoor unit that is bad or stuck, or a problem in the thermostat with the fan contacts not opening when its satisfied. Pull the cover from the thermostat to expose the wiring. Find the G/Green wire. This is the fan wire. Take a small screw driver and carefully loosen screw and take this wire off. Give it a couple of minutes to see if it shuts off. If it does shut off, the thermostat is faulty and you will need a new one. If it still runs, you will have to check the indoor unit and find the fan relay. If this system is gas fired for heat, it will have a combination fan/High limit control that is the problem, more then likely stuck. Look at the wiring diagram on the panel and it will show you the fan control. You can try tapping on it to see if you can un- stick it. If not, it will need to be replaced. If its just a fan relay, it will be black about the size of a wooded match box with around 5 wire terminals on it. If you have someone turn the stat on and you should be able to hear it click. Do the checks with the stat and let me no the out come and we can go from there.
Shastalaker7

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1 Answer

I have a 2005 Pilgram 27 foot 5th wheel. My Duo Therm AC unit makes a ticking sound from the ac unit itself when it's not running. Shutting off the Duo Therm analog thermostat does not stop the ticking...


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1 Answer

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1 Answer

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