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When you turn the the system off (at the thermostat), the fan turns off but the compressor remains on. It doesn't go off and continues running 24 hours a day.

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The thermostat actually sends low voltage to the contactor switch built into the unit outside (condenser). Use caution as there is high voltage involved. Turn power off to the unit before attempting to service (usually, there is a cut-off /service switch on the wall of the house very close to the unit). If you are a serious tinker-er, you can replace the contactor (sold on ebay and other locations, obtain part number from old switch or up grade to better quality). Below is nice video on the subject or contactors. You may also want to call service company just to make sure damage has not done the the condenser /compressor from continually running. Good luck

http://www.youtube.com/watch?v=mm5hxwgccQ8

Posted on Apr 09, 2011

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2 Answers

2002 4 ton Bryant air conditioner shuts off, fan still runs but not cooling is problem in the controls in the attic or in the AC unit or both?


With a non heat pump it is a simple 24 volt AC control circuit. In the attic there is a relay that is actuated via the fan control wire directly from the thermostat. On the thermostat there is an auto/man switch that controls the fan. Manual the fan runs all the time. Auto fan turns on and off with the outside compressor.

If the system is not calling for cool and the fan continues to run the fan relay is sticking. common problem. Sometimes after running for several days the relay will stop sticking if not, replace relay.

If the system is calling for cool and the compressor stops I would still expect the fan to run until thermostat tells the A/C to off. Some compressor units include a safety switch or high-pressure cut-out switch A blocked internal valve bad control board or external fan in outside unit defective no air flow in outside unit.
High pressure cut out not good,

Suggest turning temp max cool and observe. If acceptable cool and the compressor runs without interruption all is good, except for the blower in the attic. Safely check relay in attic blower circuit.

Hope this helps.

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basic-thermostat-wiring-diagram-czwsw2ci0layswcsyy3dj4dr-4-5.jpg

Jun 28, 2017 | Bryant Heating & Cooling

Tip

Understanding Air Conditioner Electrical problems is not as hard as you can make...


Air Conditioners are broken down into two electrical systems, though they work together1. Low voltage control unit 24-28 volt control unit like thermostat and other switches and relays( also feeds compressor contactor,reversing valve, and defrost board on heat pumps)on the outdoor condensing unit .When there is no power to the thermostat,it cannot turn on the indoor fan or any other load (indoor or outdoor). In this case, first confirm there is power available (closed breaker,closed disconnect) If you have power the fan on manual switch on the thermostat should be able to turn on the indoor fan.If it doesn't, then your control voltage is most likely lost. check the transformer and 3 amp fuse in the air handler .2.The high voltage components are your compressor and your fans, both indoors and outdoors.High voltage 240 volt loads are controlled by the 24-28 volt control voltage.3. Remember, a thermostat is just a big on/off switch.4.Be careful and always play it safe when working around energized circuits5. Leave it to the pros, especially if you're inexperienced or nervous about electricity

on Aug 22, 2013 | Heating & Cooling

1 Answer

Intertherm MGHA-070ABFC-05 will not run/cool


Multiple problems. Eliminate thermostat first. Remove face from wall and turn on breaker. If fan still runs you have a bad board or bad relay. If fan outside is running compressor should be too. These operate on same contactor. Verify you are getting 24 volts to coil side of contactor. If odf stops working and contactor remains pulled in you have a bad motor. If odf motor stops working the compressor will shut off due to overheating.

Jun 07, 2016 | Intertherm Heating & Cooling

1 Answer

Cool will not come on when it's set in auto mode


A thermostat is only a switch, nothing more. It's job is to cut on and off the cooling/heating equipment based on a preset temperature setting. It sends 24-28 volts to a contactor or relay which does the actual closing (turn on) or opening (turn off) the power to the compressor or furnace, and that's all it does. There could be a problem with the other parts of the system. When the space temperature exceeds the preset temperature the thermostat should provide 24-28 volts to the compressor contactor, to start the compressor. The "Auto-on" switch on the thermostat controls the fan only. If there isn't 24-28 volts from the thermostat to the coil of the contactor, the compressor will not operate,

Oct 30, 2013 | Hunter Fan Company 42999B - Heat/Cool...

1 Answer

Beverage-air DW freezes


Try turning thermostat knob all the way to left or counter clockwise. This should shut the compressor off. If the compressor continues to run the thermostat is stuck closed & bad. If the compressor remains off with thermostat turned all the way to the left try turning it slightly to the right (warmest setting). See if it stops freezing. If it continues to freeze set at warmest setting replace the thermostat. Try pricing a thermostat out at Refrigeration Hardware. Link attached. Refrigeration Hardware Supply

Oct 05, 2013 | Beverage Air Refrigeration Deep Well...

1 Answer

Carrier 48NMX042 IFM wont stop, condenser fan motor and compressor wont run


Ok first thing is it sounds like a wiring problem. So first step is to make sure the thermostat is properly connected. Which... the main thing here is there needs to be 24v dc power coming from your control board (transformer) going to the thermostat..generally that is the red wire. All the thermostat does is connect that "red" wire (power) to one of the other wires to complete a circuit. So make sure you have 24 volts... (generally about .5amps) . if you have power than switch thermostat to fan only should energize the green wire only. then switch to ac and move temp low enough that the ac should turn on and that should energize the yellow wire. for sure one of those wires is incorrect now or the fan wouldn't be on OR THE THERMOSTAT IS NOT CONNECTING THEM AND IT IS BAD. Now about the compressor and fan.... those same wires run out to the compressor unit... ok the yellow for ac.. greeen does not go to compressor unit that is for fan only (vent).. red carries the same 24 volts... one difference here is that most carrier units only have the one transformer....so you run the red wire is the +pos 24 volt..and then a "common " wire is needed which is the Ground or neg... that wire on a carrier is brown usually but could be different depending installer. The orange wire goes to the pump reversing valve it is always energized when on ac mode...when heater is on in the winter it is heat pump and is not energized so just connect the orange and yellow together... tell me more specifics if this doesn't help and i'm sure I can help you... thanks Chuck

Jun 22, 2012 | Carrier Heating & Cooling

1 Answer

Fan does not turn off even after disconnecting


Are you referring to the fan on the external mechanism, or the internal air handling fan?
The external fan is not controlled by the internal thermostat. it is controlled by the thermos-witch of the compressor. The external fan may or may not run when the motor is operating. it depend totally on the temperature of teh compressor, and not the internal thermostat.
It the internal air handling fan is running continuously,it may be a a problem with the fan setting. check if the fan is set to 'ON' instead of 'AUTO', and correct it.
Incidentally the fan operation I described, is for modern, energy efficient heat systems. This is a energy saving design incorporated in all heating systems including automobile radiator fans.

Jan 31, 2010 | Goodman Heating & Cooling

1 Answer

Rheem Heat Pump outside fan seems to be running 24 hours per day. Outside temp 23 degrees. Is this normal? Model #RPKA-018JAZ


no this is not normal. the fan should stop running when the thermostat is satisfied or when the heat pump goes into defrost mode. if it is running nonstop, there is a contactor that operates the fan and compressor that if it sticks will get line voltage to it. you would have to take the cover off of the outside unit and turn the thermostat to off. If the fan continues to run, you need a new contactor.

Jan 13, 2010 | Heating & Cooling

1 Answer

Freezer comes on fan starts after a few seconds goes off freezer unit freezes solid fan doesnt come on again fan is ok


Good day,
When the thermostat is turned on, the fan and compressor should come on and start at the same time. If the compressor continues to run and the fan doesn't, then the fan motor or the wiring to it are suspect.

Quote (The fan motor is o.k ). I doen't know how you tested it, but it still remains suspect, since the thermostat sends power to both of them at the same time.

Nov 03, 2009 | Whirlpool Freezers

1 Answer

Will run and cool until the thermostat turns it off and will not start back up. Inside fan continues to run. Compressor is completely dead.


Dear jack289,
The thermostat is not working properly. When thermostat cutsoff the compressor Please turn the thermostat knob to higher setting if compressor starts working then please change the thermostat. The fan will run continuously since only the compressor is controlled by the themostat.
Regards,
ramesh22

Jun 25, 2008 | Intertherm Heating & Cooling

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