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  1. #1

    Honeywell Subbase question

    I had original equipment multistage thermostat subbase model
    Q674b 1034 (8948)
    and need to replace this item.

    I have found many replacements but the number in the parentheses is always different. The model I am considering is (9929)- the heat off cool and auto on switches are the same.

    My question is :

    what is the significance of the 4 digit number in parentheses after the Q674B 1034?

    Thank you kindly,

  2. #2
    Join Date
    Nov 2001
    Seattle, WA
    Best way to find out is to contact the Honeywell web site itself. You are dealing with old, old technology and will probably find it easier to convert to a newer digital thermostat in the short run.

    The switches and contact points in those sub-bases are famous for giving out.
    "The American Republic will endure until the day Congress discovers it can bribe the public with the public's own money.
    - Alexis de Toqueville, 1835

  3. #3
    Join Date
    Jun 2002
    nw ohio
    "what is the significance of the 4 digit number in parentheses after the Q674B 1034?"

    looks like manufactured date. first two numbers are year. second two are week.
    compressors never die; they're always murdered!

  4. #4
    Join Date
    Feb 2006
    date code

  5. #5
    Thank you so very much gentlemen for the information (and advice). I wanted to go the programmable digital route in 2004 but the buildings owner (my dad), far from being a luddite, does not deal with technology so well. He can easily operate the "old school" thermostat but one with a digital display, touch screen, or buttons that require multiple presses or have multiple functions confuse him. Replacing the subbase is well within my skill set, so I might do it a second time.

    That said, we had issues with the second unit not kicking up the heat when we needed it this past winter and I really don't want to swelter this summer so it may be time to get the "pros" in to give the system a good cleaning and tune up with a new thermostat to boot!

    Thank you again,

  6. #6
    Join Date
    Aug 2006
    Central Indiana
    Quote Originally Posted by chillerout1 View Post
    date code

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