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CM907 time falls behind

Discussion in 'Plumbing and Central Heating' started by Pthomass, 21 Dec 2019.

  1. Pthomass

    Pthomass

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    Hi,

    I have 3 pieces of Honeywell CM907 thermostat in the house for my years. The one in the bathroom is the oldest one.

    This one does not hold time. Whenever I set time again to the correct time, it starts to run behind over time. It does so slowely, meaning it now runs behind over an hour while I reset it some years ago.

    Anyone an idea if this is just one with a faulty board or can this be fixed?
     
  2. kidgreen61

    kidgreen61

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    Seems to be a common fault with them, hard to believe given that digital clocks have been around for years.

    Fortunately, it's very easy to correct the time
     
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  4. Pthomass

    Pthomass

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    Hmmm...
    So it's embedded in the hard/software then
    Then indeed, adjusting time every now and then will be the only solution
     
  5. Pthomass

    Pthomass

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    no,
    It just “counts” wrong
    As if it is missinf a second or so per day

    by now that has cumulated to about an hour
     
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