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Thermostat set at 74, but air conditioner won't turnoff

I have my thermostat set at 74, but the air conditioner won't shutoff until it's below 70. Many times I have to manually shut it off? It would run for an hour or more. Does my Honeywell Thermostat need recaliberated?

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Need to reset the lever sensitivitie( behind the cover) to a lower setting.

Posted on Jul 22, 2009


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My furnace runs to operating temp on thermostat shuts down then within 30 seconds try's to cycle back on three to four times. What would cause this.

Some thermostats have a swing setting that can be adjusted. A swing is the setting when you want the furnace to stop or start from the desired set point. For example, you set your thermostat at 70 and the swing is set at 10 degrees. Then the furnace will turn on 5 degrees below 70 and shut off 5 degrees above 70. Check you thermostats manual if it has this option.

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We set it at a temreture of 70 degrees but it wont go of when it gets really warm in my house does that mean that the termostat is old or what ????

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My thermostat show 74 degrees as a current room temp...but we have it set at 70 and it's probably 65 in the house. ..the only way it will turn on is if I put it 74 or 75????

The old white-rogers thermostats with a mercury switch are adjustable. snap the face off. In the center you will find a plastic slot screw. set the indicator to the actual room temp.
Other type ? Replace the thermostat

Mar 01, 2015 | Heating & Cooling

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Set thermostat at 74 heat pump will not cycle it will cycle at 75 degrees ?

check stat calibration. see if you can measure temperture at stat. the thermostat cover temperture reading is not that accurate.

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Thermostat will not go below 74 previously would go to temp set.

Once it shuts down it will stay off for about five minutes to protect the compressor...
Here is a tip about trouble shooting your air conditioner...

Air Conditioner Trouble -Review the Possibilities


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Installed the Honeywell RTH2300

at the thermostat you have a small tolerance (most have 5% + or -) few degrees is not a problem ex...70F= 21C and 82F=27C this diference is inertial, you can set a lower temperature(ex...60 F to reach 72 F) the problem is if the temperature grow and never stop until the saftey thermostat stop the heating.also is posible to have a broken thermostat(work thermostat) and in this case it must be changed whit new one or the teperature probe is plced in a wrong place.

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Honeywell th8000 I can not set the cool setting any lower than 70, I thought it was supposed to go down to 40

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Jul 28, 2009 | Heating & Cooling

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My carrier unit will not shutoff runs conitnuously until early morning hour.had it looked at and has plenty of coolant and clean air filter.thermostat is set for 73 and will fluxuate from 74 to 75 will not...

what about the condenser. it needs to be cleaned too..

please check the could be just dirty.

i hope i was able to solve ur problem..

pls rate me..



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