Fan on unit not running - Heating & Cooling

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.

Not knowing what type of refrigerator, or to what fan you are referring, it's a difficult question to answer. In many domestic units, the fan inside the unit (evaporator fan) does run all the time. In all commercial units it does.

In newer domestic units, the fan speed may modulate, being controlled by a 'computer' that keeps it running at a minimum energy draw to still maintain the temperature.

Hi Brandy,

As for your fans, the fans in the back of the unit, (bottom back of the unit, not inside) is called a condenser fan motor this only cools the compressor for the fridge. This fan only runs when the compressor is running. The other fan is in the freezer section and is a variable speed fans motor, this can do two different things with only one job. The fan itself can ramp up and down in speed to control air flow and temperature demand in the two sections. This can run a lot but should slow down when temperature is met or while in a defrost mode. So to sum up this answer, it is common to hear fans run in the newer unit over the older units. Believe it or not do save energy with just moving air over running the compressor all the time.

I hope this helps.

I’m happy to help further over the phone at https://www.6ya.com/expert/gere_bf68e6055dd61249

Make sure your tstat is programmed for electric, not gas. Or in the settings you want that the TSTAT CONTROLS THE FAN.

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

the fan control is not for the fan on the top of your outdoor unit. that is for the blower, you have 2 fans. Im guessing you have a split system, 1 unit inside and 1 outside?? Does the outdoor fan continually run??

If you need further help, reach me via phone at https://www.6ya.com/expert/thomas_092728000e6acb79

If the fan is not running is the compressor not running also...if neither is running the possible reasons are 1..no power to outside unit...2..bad contactor on outside unit.is this buzzing if it is this indicates no power...3 bad capacitor,do both compressor and fan humm then quit humming and hum some more...4 high pressure switch has shut unit down because fan wasnt running if compressor was running but not fan....if your unit has this there will be a manual reset button where the lines come out of unit...if compressor was running and fan was not...1 bad fan...2 bad capacitor.. if you do not have any electrical knowhow i would recommend calling a hvac tech to come and fix unit...Thanks

Some fan in outdoor works only after pressure build up.

It sounds like the run capacitor of your condensor fan failed. When it fails, it can prevent your fan from starting unless you manually spin it to get it going, then it could run for awhile before it overheats.

You just answered your question. If no fan is running then the compressor will overheat and the compressor goes off on overload. Do you have the evaporator fan running? If yes then replace the condensor fan. Both fans will run at the same time. If the evap fan is not running then the unit must be in defrost. Since its a hotgas defrost the compressor will run.
Hope this helps

I HAVE HAD A COUPLE OF UNITS THAT HAVE KEPT THE FAN RUNNING ALL THE TIME. I REPLACED THE CONTROL AND THAT TOOK CARE OF THE PROBLEM.