Central air will not shut off .New thermostat set on 73 run all day!!!

Today set on 74 runs all day .did same thing with old one .have to cut off manually .anyone knows what wrong .

  13 answers
  • Diana Deiley Diana Deiley on Jul 19, 2017
    The fan is probably set to ON and it should be on AUTO. If the fan is ON it will run all the time 24/7 causing your utility bill to be excessively high. If that doesn't fix the problem, call your a/c company as soon as possible. Good luck.
  • Peg Peg on Jul 19, 2017
    You should have a professional check that. It could be in your wiring which could be a fire hazard.
  • Sharon Sharon on Jul 19, 2017
    Did you have it serviced this year? changed the filter?
  • Tina Tina on Jul 19, 2017
    did you flip the breaker,,,,sometimes it needs reset
  • Cynthia H Cynthia H on Jul 19, 2017
    Was it a self repair DIY or a professional update? If a HVAC tech recommended it, have them come back. It may need a good cleaning, or something else minor. Systems can be tricky and it's too expensive to just keep trying different things.
  • Darlene Mccullough Istre Darlene Mccullough Istre on Jul 19, 2017
    It's possibly wired wrong
  • Jodi Belcher Jodi Belcher on Jul 19, 2017
    Check your unit outside. If it's frozen over your unit has a thermostat in it that need replaced.
  • Russbow Russbow on Jul 19, 2017
    I have a heating thermostat, with a similar problem. With an infrared temperature "gun" I discovered that the flue for the heating fire place, went right up the wall through the roof, and it heated the wall sufficiently to really foul up the thermostat. So look at the actual location and if there is anything that is affecting it. It took crawling under my house to completely relocate the thermostat, where it would not be affected by the wall heat, only the room temp.
  • C. D. Scallan C. D. Scallan on Jul 19, 2017
    I'm not sure where you live , but its 95 in the shade where I live right now . Also , make sure its set to Auto and not Run or On.
  • William William on Jul 19, 2017
    It depends what the outside temperature is. If its hot it will take longer for the temperature to drop. Outside unit may be low on freon. Furnace blower should be set on auto. Replace filter in furnace. If outside unit is in direct sunlight will take longer to cool off. Have it checked out by AC technician.
  • Jason Walker Jason Walker on Jul 19, 2017
    Possible wiring
  • Debra Petersen Debra Petersen on Jul 20, 2017
    Either the filters are plugged, the unit is filled with dust or dirt and needs to be blown out or washed out, or you are low on freon.

  • Betty Betty on Jul 20, 2017
    I would like to thank everyone for their help .tried all of them .none worked .time to call experts .
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