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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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1 Answer

Why can't I lower my honeywell 8500 below 67 on cool?


With a two story house you have to be aware that cold air flows downwards so any cold air coming from an ac unit will flow downstairs( normally down the stairway) so unless you can close off the down stairs then the up stairs unit will be cooling downstairs as well. Ac units have a thermostat located in the air intake and it cools until the cold air has risen to that point. In effect the space above the ac unit will be hotter than the floor. Knowing how they work ,you can see that the upstairs unit will never reach the set temperature because the cold air is continually heating from the house and will never get to the top thermostat.
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)3 place an ac in each upper room and keep the room door closed

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Here is a tip that tells you how to get a manual for most any Honeywell productonline...

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heatman101

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Recheck the wires to make sure that you are calling the outdoor unit to cool! Wires that call for cooling are R to Y and R to G calls indoor fan on! This usually happens at the same time in the thermostat when call for cooling is tripped, Green wire turn signal to indoor fan on and Yellow wire fire 24v to the contactor oudoors to the compressor and outdoor fan. Check all wires for contact an breaks.

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I have never used central ac before - how do I set it? If it is on 75 will that cool the house? If I want it cooler, do I put it lower? like 65?


As to your question 'will 75 cool the house?' The answer is 'yes' - if the outside temperature is low enough. Typically speaking you can expect your central AC to cool a properly insulated house to a down to a temperature of about 20-25 degrees lower than the outside temperature. For example - if the outside temp is 95 degrees. You could expect to get your house down to 70-75 degrees. If the outside temp is 110 degrees then you could only expect to get the house to 85 or 90 degrees.

So .. as you can see - your 'inside' temp will be directly affected by the 'outside' temperature.

As to the operation of central air; it is very simple.

I would suggest that you not pay 'too much attention' to what you have the thermostat set on. A comfortable temperature - is a personal thing - so - I would set it somewhere - say 72 and see how I (and others in the house) was handling that setting.

If you want it 'cooler' just 'notch' it down a degree or two - if you need it a little warmer - turn it up a degree or two. Do this "fine adjusting" till you have the temperature setting you are comfortable with.

Usually the more you can leave your thermostat alone the better off you will be from a comfort position and an electrical useage standpoint. Obviously, the higher you have your thermostat set the 'less' it will cost you on your electric bill.

How high you set the temperature is a balance you have to come to based on how comfortable you want to be - matched with how much you want to hold down the electric bill.

hope this helps

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