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Viessmann Boiler zones

Mrb1977
Mrb1977 Member Posts: 1
edited December 2021 in Gas Heating
Hi there, I have a Viessmann boiler that isn’t working up to par. I have three zones on the unit and one zone doesn’t heat like it should. The other two zones will call for heat. I just replaced my mercury thermostats with a Honeywell programmable. Is the new thermostat not compatible with the system? Thanks everyone. 

Comments

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 16,470
    Was it working before you changed the thermostat?
  • Zman
    Zman Member Posts: 7,611
    The boiler is probably not controlling the individual zones.
    Do you have zone valves or circulators?
    Do you see a separate zone controller?
    Pictures help.
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein

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