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The builder of my house preset my honeywell thermostat such that it could not be adjusted below 72 for cooling. This was to prevent subcontractors from setting it lower while doing interior work on the house. I never learned how to de-program it so that I can set it lower than 72 degrees. What do I do?

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  • elcinco Apr 25, 2008

    I'm uncertain of the exact model number.  The owner's manual is for an "Eletronic Heat-Pump Thermostat" for T8501, T8511, T8524.  I don't have a heat pump, though.  The thermostat has both up and down arrow keys and an "i" key.  When you flip the panel open it has a "system" button and a "fan" button.  The "i" key is what you press to learn the temperature setting.  If I hold both arrow keys down at the same time, it gives me a screen, but I don't know how to make any adjustments from that point forward.  

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Try reseting the circuit breaker first and see if that fixes it

I can get you a manual but I need the model number of the unit

Please let me know if the simple reset of the circuit breaker fixes it.

Notify me by posting here if it doesn't

Thank you for using Fixya and Good Luck



please don't forget to rate my solution as soon as you solve your problem, thanks

Posted on Apr 25, 2008

  • Benjamin Patri
    Benjamin Patri Apr 25, 2008

    don't rate a solution until the problem is solved and only rate "Fixya" if the poster was the one to tell you how to fix it.

  • Benjamin Patri
    Benjamin Patri Apr 25, 2008

    you should be able to press the i button and then just arrow up or down to change the temp

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What is the model # of this Honeywell thermostat?

Posted on Apr 25, 2008

  • Matt Jurach
    Matt Jurach Apr 25, 2008

    That sounds a lot my my thermostat. Does it have a "Run" button?

  • Matt Jurach
    Matt Jurach Apr 25, 2008

    For me, the arrow buttons will adjust the set temperature, but not permanently if a prior program is engaged. Pressing the "Run" button will cancel the program and allow the buttons to set the temperature for real.

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