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Thermostat can't activate shared pump to boiler

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Alex488
Alex488 Member Posts: 1
in THE MAIN WALL
So I got an ecobee thermostat in one zone and a regular old school thermostat in another zone. They share the same return pump to boiler. For whatever reason, the ecobee stopped being able to activate the pump. When I turned temp up on conventional thermostat, everything was fine including green light on relay board turned solid green, pump starts, heat comes. When I turned temp up on ecobee, the green light on relay board flickered but didn't go on, no pump, no heat. For me to get heat in zone controlled by ecobee, I have to turn temp way up in the other zone so the pump is running. Does anyone know what issue I am dealing with? Btw, it's been having this issues on and off recently

Comments

  • Alan Welch
    Alan Welch Member Posts: 268
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    Does each thermostat open a zone valve? You may have a bad end switch on the zone with the. Ecobee.
  • HomerJSmith
    HomerJSmith Member Posts: 2,441
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    Insufficient data to make a analysis. Maybe the ecobee thermostat need a jumper between the R & RH. Did it work before and you are now experiencing problems or is it a new addition?
  • Jamie Hall
    Jamie Hall Member Posts: 23,324
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    Batteries in the Ecobee?
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • krimm
    krimm Member Posts: 3
    edited February 2018
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    We actually have the same setup but my ecobee cooperates well with our old thermostat, so far. Did you install it on your own? Maybe try asking for professional help?
  • HVACNUT
    HVACNUT Member Posts: 5,841
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    Is the Ecobee 24v powered or just R-W? You might need a common or a resistor.

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