Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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Have arrived at my 81 year old mother's house in 106 degrees AND I CANNOT GET THE DIGITAL THERMOSTAT to TURN ON THE AIR and FAN. HELP!

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  • nancygrah67 May 18, 2009

     Honeywell THermostat (did check circuit breakers). I press SELECT, press arrow for lower temp, and Press hold.  (At bottom I switched to Fan On and to Cool). 
    Doesn't appear to be batteries.
    P.s no wi fi at her place. my cell is 310 9519191 if anyone wants to call with help (its too Hoooottt! to sleep.

  • nancygrah67 May 18, 2009

    Air has not been in use for some time (nor heat)

  • Wayne Holden May 11, 2010

    Let's back up a step. Does anything work? Fan to on and what happens? Neither heat nor air has been used for some time so there is the possiblity that something has chewed the wiring up or built nests in places that stop things from working. Dirt daubbers are bad, mice eat everything, ant's love to live in contactors and switches. You may have multiple problems due to lack of use. Would call but will wait till daylight as most of the things you are going to have to check will require some light adn I'm sure you don't want to be fighting wasp and/or ants in the dark!

  • Wayne Holden May 11, 2010

    Check the breakers, don't forget that the outside unit may have a safety plug or a breaker box or switchbox of it's own out side.

    Did you just switch from heating or has the ac been in use for a while?



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Slide switch to cool and press doen button to lower the temp to desired temp. Check thermostat to see if it needs batteries by snapping front cover off. Good Luck

Posted on May 18, 2009

  • Ned C Cook
    Ned C Cook May 18, 2009

    slide switch to cool and press doen button to lower the temp to desired temp. Check thermostat to see if it needs batteries by snapping front cover off. Good Luck

  • Ned C Cook
    Ned C Cook May 18, 2009


    How did it go last night? Did the temp pull down as we had hoped? I wanted togive you this bit of information concerning the thermostat controls. Let's see if I can do this without confusing us both.

    The one that is of greatest concern is the select button. Use of the select button allows you to scroll through 3 diferent time periods. When you come to the time period you want, using the arrows, set the temp where you prefer. then press set. Do this with each time period. If you want to maintain a constant tenp, like 74,then all time periods need to be set accordingly. Try not to keep the temp down too long or all day. The desert is comfortable between 2 and 6 am so 34 should be just about right for keeping the house cool andcutting 4 hours off of the daily run time.The hold button is to hold the temp at the current temperature until it changes at a preset. or you release it to current preset.

    If I can (If) I can do any more for you, feel free to call. You know where to find me.- NC



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