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ron w Posted on Oct 04, 2015
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Heat set on 70. Temp indicated is 67. Why does it shut off then automatically change to cool mode?

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Cris Sparks

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  • Expert 338 Answers
  • Posted on Oct 04, 2015
Cris Sparks
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Check your programming on your t-stat

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Elp with Peco TA-170 Thermostat setting?

The Peco TA-170 thermostat is designed to control both heating and cooling, and it appears that it may not allow for separate temperature settings for heating and cooling. However, you can adjust the set point temperature for both heating and cooling modes at the same time by following these steps:
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To reset the thermostat to its factory settings, follow these steps:
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  2. The display will show "RST", indicating that the thermostat is resetting.
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Please keep in mind that resetting the thermostat to its factory settings will erase all programmed settings and return it to its default settings. You will need to reprogram the thermostat to your desired settings after the reset.
tip

Temp cut off/cut in

Any thermostat, it's calibrating to cut off at the end of 2nd beginning and cut in 2nd ending of temp.<br /> Ex: In heat mode, If you set @ 68 degree, it will cut off 70 degree beginning and cut in at the end of 66 degree. <br />In cool mode, if you set at 68 C degree it will cut off at the end of 66 and cut in will be at the beginning of 70 degree.<br /><br />
on Jan 10, 2011 • Heating & Cooling
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Dometic Duotherm Thermostat Control changes temp on own, will have it set on 70 and after a while it will automatically go to 55 or change from Ac to furnace automatically

If it had batteries try changing, or cleaning the contacts, still malfunctioning, change thermostat universal will work if wired type.
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Heater run a min trhen cut off, temp set at 75 house temp is 70

If it's a furnace then flame sensor might be bad .if it's a electric heat then your limit might be shutting it off .If electric then check for fan operation .
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How do i adjust AC temperature variance on a Honeywell TH5220D1003 thermostat

If you are talking about the difference between heating mode and cooling mode and the room setpoint, you can not change it. It comes from the factory with a 3 degree difference. In other words if you raise the heat setpoint until it is within 3 degrees of the cooling setpoint, for every degree you raise the heat setpoint the cooling will raise a degree.
About all you can do is increase the distance between the heat and cooling setpoint. To do this either lower the cooling setpoint to 3 degrees higher than the heat setpoint you want and then increase the cooling setpoint the desired setting. For example heat and cool setpoints are 67 and 70 respectively, and you want 65 and 73. Lower the cooling setpoint to 68 and then raise the cooling setpoint to 73. Now your heating will come on 3 degress lower than 68, the 65 you wanted and cooling will come on at 73. Remember, the thermostat new setpoints will turn on the cooling at 75 and turn back off at 73 and heat will turn on at 63 and turn off at 65.
You can perform the same using the heating setpoint, just have to look at it backwards. If you need to lower the difference I recommend a 8000 series thermostat. They are the most functional thermostat that Honeywell makes, be in mind they are about 3 times more expensive and many of the setting require a well trained tech to interpret and set properly.
Hope this helps.
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Braeburn 1200 thermostat cool air blows out when set to heat

I have a feeling your thermostat needs replacing. Check and see if there is a little screw that you can set to increase the temperature on the thermostat.
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The ac is not working properly. It goes from cold air, to hot air. I charged the ac with R134 coolant, but is not helping. What is the problem?

If your unit is cooling and heating ok make sure the mode your on is not an automatic mode as this makes the unit change between heating and cooling to maintain set temp select either cooling only mode or heating only mode this means once set temp is reached unit will stop until it notices a rise or drop in temp and will come on again in your set mode
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Wont allow me to set thermostat below 73 degrees?

You never said what type and model of thermostat you have....... If you have a digital stat You may have to lower the HEAT setting below 67 degrees if you want to set the AC to 70 degrees. If the thermostat has an Auto feature then it has to have a 3 degree differences between heating and cooling. On the newer models it does it automatically if you lower the Cooling setting it will lower the heating setting......It this doesn't help repost with more information so I can help you better....
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Does the T8602C1095 have an anticipator that may need adjustment when the temperature set is exceeded, eg we set at 70 and it goes to 71-72 and then need to manually shut down system.

that is how they work. ther is a 1 to 3 degree variance up or down.it probaly does not kick back until 67 or68 degrees. a two stage furnace will keep a more steady temp.
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