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Honeywell T87f 3855 Doesn't Activate Heater

Hydronic Buderus system, Honeywell controllers (above).

Three zones, each master/slave.

One zone giving trouble.

In one zone, with thermostat set at 61 degrees, heater does not kick on, even when ambient room temperature is 51 degrees. Cycling the thermostat, i.e. "off/on", then setting temperature at 65 degrees or above, will deliver heat.

When running, heater will heat room to temperature set on thermostat (e.g. 62 degrees = 62 degrees). Problem is, thermostat won't kick heat on - even with 10 degree difference in set vs. actual temp.

Anyone have thoughts?

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  • acmemodelers Jan 25, 2009

    ??

    This is a master/slave combination, upper & lower floors.

    The master zone is "on/heat", and set at 61 degrees.

    The slave zone is set at 61 degrees.

    At night, the temperature in both zones, under the above scenario, drops to 51 degrees by morning.

    The master is "on".

    The other two master/slave zones in the house also remain "on/heat" at night.




  • acmemodelers Jan 25, 2009

    No, boiler does not have outdoor thermostat. The whole unit, boiler, expansion tank, hot water tank, air handlers. . .everything is in the basement.

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  • Master
  • 700 Answers

Thats becaue you need more than this zone working like you said about the master/slave this zone is a slave.

Posted on Jan 25, 2009

  • Todd Born
    Todd Born Jan 25, 2009

    ok does the boiler have an outdoor thermostat?

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