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Thread: Evohome HR91

  1. #1
    Automated Home Jr Member
    Join Date
    Jan 2022
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    13

    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°. 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 AndrewScreenshot_20220110_114444_com.honeywell.totalconnectcomforteurope.jpgScreenshot_20220110_114453_com.honeywell.totalconnectcomforteurope.jpg

  2. #2
    Moderator toscal's Avatar
    Join Date
    Oct 2005
    Location
    Near Alicante Spain
    Posts
    2,055

    Default

    You are in the wrong thread. This should be in heating.
    What is your outside temp for a start.
    Also the way temp control works is that say your target is 18.5 then the temp won't switch off at exactly 18.5 it will normally switch off when the temp is say 19.5, normally this over temp level can be set up, sometimes it is referred to as Hysteresis. Last heating system I worked on for a client, you could set this over temp from between 0.5șC to 5șC the default was 3șC, and there was a separate under temp setting . You may want to check this out. So if the under temp is set to 2șC then the heating won't come on again until 16.5șC. If you set these temps to 0 or too low then your heating system will always be on, as its trying to fight with itself to maintain the temp.
    IF YOU CAN'T FIX IT WITH A HAMMER, YOU'VE GOT AN ELECTRICAL PROBLEM.
    Renovation Spain Blog

  3. #3
    Automated Home Jr Member
    Join Date
    Jan 2022
    Posts
    13

    Default Wrong thread

    Thanks toscal, I have submitted it again in the right place. Cheers Andrew

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