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Thread: Evohome HR91

  1. #1
    Automated Home Jr Member
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    Jan 2022
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    Default Evohome HR91

    Hi, I have a Honeywell Evohome system with HR91 radiator thermostats.

    I have one zone, DINING ROOM, which shows 22 although the target temperature is 18.5. All the other zones keep within 0.5 of the target.

    Any idea how this can happen and how do I fix it?

    I have attached 2 screenshots showing the schedule and the zone view.

    Cheers Andrew

    Screenshot_20220110_114453_com.honeywell.totalconnectcomforteurope.jpgScreenshot_20220110_114444_com.honeywell.totalconnectcomforteurope.jpg

  2. #2
    Automated Home Jr Member
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    Feb 2019
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    Default

    Do you have cold weather compensation with a 3.5 degree boost set up for this room only?

  3. #3
    Automated Home Guru
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    May 2021
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    Default

    Is the radiator still hot to the touch after the target temperature has been reached? ie it's not cooling down?

  4. #4
    Automated Home Jr Member
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    Default

    Thanks for the question about a boost for the room, I don't know how to check?

  5. #5
    Automated Home Sr Member
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    Oct 2020
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    Default

    Quote Originally Posted by awiatr View Post
    Thanks for the question about a boost for the room, I don't know how to check?
    Cold weather boost should show as an icon on the controller against the zones where is has been enabled and is active.

    The fundamental question is - Is the controller calling for heat, or is the HR91 not closing the valve correctly, perhaps because it has not been installed correctly, or is not compatible with the valve.
    To answer the first part, on the controller, long press on Settings (5ish seconds), and then look at System Summary. This will tell you if the zone is calling for heat.

  6. #6
    Automated Home Sr Member
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    Default

    If Boost was on the setpoint would be 22'C..

    Is your radiator oversized for Room..

    Do you need to balance the radiators?

    Below is a non technical way of maybe finding a solution.
    Try restricting flow in or out of radiator by closing valve at opposite end of TRV and then open quarter turn..
    When TRV is open demanding heat if the radiator is heating up, great, wait couple of days to see how it goes, if temperature overshoot has stabilised, great.
    If it is taking to much time heat up radiator and room, try 1/8 turn more. Repeat till OK.

    Maybe your TRV valve is jammed open mechanically.

  7. #7
    Automated Home Jr Member
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    Default

    I couldn't see an icon against the zone. How does cold weather boost get set/unset?

  8. #8
    Automated Home Jr Member
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    The radiator valve has been working as expected for several months, so I think it was installed correctly.

  9. #9
    Automated Home Jr Member
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    Jan 2022
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    Default

    I have deleted the zone and recreated it and will see what happens.

  10. #10
    Automated Home Sr Member
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    Aug 2019
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    62

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