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Viessmann Trimatik-mc issue

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jmw_ma
jmw_ma Member Posts: 1
in Thermostats and Controls
I have a viessmann trimatik-mc installed in 1999. so far so good... I installed sensors to investigate the usage of 9 zones from a supply and return standpoint. After a couple of days I investigated the graphs. I noticed that two 1 hour times during the day the main supply dropped the temperature. I believe the Trimatic-mc is telling the supply to reduce the temperature. I reset the system and set the clock. I am still seeing the one hour drops. In trying to setup the Weekday and time selection I am not seeing the time displayed on the lcd display. I do not remember if this is to be displayed. The manual does not show this. Does anyone know about this? Thx...

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  • meplumber
    meplumber Member Posts: 678
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    Time to climb into the "way back machine."

    It has been a while since I worked on a Trimatik.  I will dig for my manuals and post later.
  • CMadatMe
    CMadatMe Member Posts: 3,086
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    Bad Clock

    Change the timer and the cube. They are the only 2 parts still available for the Trimatik.



    They do make a retrofit kit to put the new controls on the boiler. The timer and Cube are not cheap....

    There was an error rendering this rich post.

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