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T9 Automatic mode

mluna20
mluna20 Member Posts: 1
in Thermostats and Controls
Hi, T9 with three sensors.  Set Automatic mode with heat to 74 and cool to 78.  It s in the 40s outside and and the house heats up to about 80.  Have to turn auto off and switch to cool.  Any idea what is going on?

Comments

  • HVACNUT
    HVACNUT Member Posts: 6,332
    Does it still override if it's in Heat mode?
    It might not be the thermostat. What type of system do you have? If it's a boiler, could be a bad check valve. 
  • ratio
    ratio Member Posts: 3,791
    What's the thermostat display?

    What are the temperatures of the three sensors? Remember that the average of 80°, 80°, and 40° is 67°. Are the sensors programmed in correctly? Is the thermostat sensor used in the average as well?

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