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Green Star Combi. 151

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JSC
JSC Member Posts: 2
in Gas Heating
The boiler won’t heat up any hotter then 120 degrees when the heat is calling. The boiler seams to heat up just find when the domestic hot water is on. The house is currently 47 degrees. The house has radiant piping. 
Thanks in advance.  

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  • GW
    GW Member Posts: 4,692
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    We need a bit more information. You might’ve lost circulation. If you take pictures of everything that looks like a control, might get lucky and figure it out
    Gary Wilson
    Wilson Services, Inc
    Northampton, MA
    gary@wilsonph.com
  • JSC
    JSC Member Posts: 2
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    The Taco circulator is working. The flame light is on  but won’t get any hotter then 110-120. 
    Thanks 
  • Ironman
    Ironman Member Posts: 7,376
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    Possibly the outdoor sensor is reading incorrectly which would cause the ODR to keep the water temp too low - if this is connected. A lot of installers don’t connect it.

    If you have it and can find it, disconnect one of its wires and see if the boiler heats the water to 180*.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • Ironman
    Ironman Member Posts: 7,376
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    I just noticed where you said that you have “radiant piping”. By that, I assume that you mean a radiant floor. If that’s so, then 120* is about the highest water temperature that should be used - assuming the floor was done correctly. If not, then anything is possible.

    As mentioned, more info and some good pics would be helpful.

    And don’t assume because a green light is on that the circulator is working correctly. It just means that there’s power to it.
    Bob Boan
    You can choose to do what you want, but you cannot choose the consequences.
  • hot_rod
    hot_rod Member Posts: 22,139
    edited January 2022
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    If the boiler is running up to 120 and shutting off, for some reason you are not circulating out to the radiant system. Could be a pump is out, air lock, frozen pipes  plugged strainer, mis wired, etc
    Did it heat adequately at some point?
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream

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