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Central haeting keeps turning on when itself

Thermostat is set correctly but just keeps turing itself on every 20 mins or so.

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  • Ron Krysiewski May 11, 2010

    What kind of heating system do you have. Warm Air "vents in floor", Steam "radiators", Forced Hot Water "baseboard along the walls"?

  • Allen Neal
    Allen Neal May 11, 2010

    what type thermostat and heat are we talking here

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Change your air filter, if the system has to work too hard, it will over heat. If the filter is allowing air flow and the system still shuts off it is the thermostat. Keep in mind the Thermostat gauges the temperature where the thermostat is located, if its next to a running fireplace it will think your entire house is that temp.

Posted on Apr 18, 2009

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Hi,Richmart
I'm Harvey the Plumber,
First, Your question is if your thermostat is wired correctly!

Assuming that it is correct, a common problem that most people and plumbers overlook is correctly setting the heat anticipater on the thermostat.
Assuming that you have a gas central heating system, then you must simply look on the gas valve for the amp rating.
For instance,if the gas valve printing says .4 amps then set the heat anticipater for .4
It's common for the unit to turn on and off erratically (short cycling) when this setting is not correct.
If all you are worryied about is the wiring, you must look at the wireing diagram that came with the thermostat.
Further diagnoses would requie detailed information about your central heating system.
Or the alternative would be to have a hands on tech help you out.

Feel free contact me again!
Please give me a rating here at fixya.com before you sign off
Thank you,
Harvey

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