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Thread: Central Heating randomly turning on when it should be off

  1. #31
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    My new Wi-Fi Evohome also seems to keep the boiler running for one minute sessions every so often for about 30 mins after all the HR92's are set to 10c, then the system seems to stop till the morning.

    Checking all the LCD on the HR92 say 10c

    Failsafe is off, Optimum Stop / Start is off.

    Is this part of the new design just in case heating is called for or should I try and reset everything and try again?

    Many thanks.

  2. #32
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    What you describe is not normal behaviour, no.

    Difficult to tell for sure but it sounds like an intermittent communication problem between one of your HR92's and the controller causing a zero heat demand message from the HR92 to not be received when the set point is dropped.

    So when you schedule all your zones to 10 degrees the controller still thinks one HR92 is calling for a small amount of heat. If the controller doesn't receive any heat demand updates from an HR92 for 30 minutes it will assume the demand is zero. That's why 30 minutes after the demand should have stopped (but didn't due to a lost message) the demand does finally stop, due to this timeout.

    Troubleshooting the problem with anything other than trial and error could prove tricky though as the system does not really give any information that would help to identify which zone was responsible, for example there is no per zone heat demand indicated on the controller to indicate which zone it thought was still demanding heat.

    A visual display on the controller of heat demand from each zone is probably the most asked for feature from forum members, and would help a great deal in diagnosing these sorts of problems, but such a feature doesn't seem to be forthcoming.
    Last edited by DBMandrake; 28th March 2017 at 08:09 PM.

  3. #33

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    Quote Originally Posted by DBMandrake View Post
    A visual display on the controller of heat demand from each zone is probably the most asked for feature from forum members, and would help a great deal in diagnosing these sorts of problems, but such a feature doesn't seem to be forthcoming.
    IM35461 - I agree with DBM - sounds like a rogue device asking for heat aligned with another 'zone' or instance. Log a call with tech support - they can put your system into monitor - and yes we can see heat demands. This is not available to the public (yet)

    livingroom2.jpg
    getconnected.honeywell.com | I work for Honeywell. Any posts I make are purely to help if I can. Any personal views expressed are my own

  4. #34
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    Quote Originally Posted by Rameses View Post
    IM35461 - I agree with DBM - sounds like a rogue device asking for heat aligned with another 'zone' or instance. Log a call with tech support - they can put your system into monitor - and yes we can see heat demands. This is not available to the public (yet)

    livingroom2.jpg
    Cool

    If it does it again I shall do that.

    What I have done as a test rather than a complete reset is to delete Zone 1, (Living Room), unbound the two HR92's and then recreated it making sure that I wait for the LCD's to stop saying "SYNC" before touching the green tick.

    I then reordered the zones to make the Living Room display first and modified the zone schedule / days.

    Of course, it has now got warmer so the system is hardly on so I can't really tell if that did the trick.

    Thanks also to DBMandrake and it looks like a monitor feature may be on the horizon...

  5. #35

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    You should have (to be sure ) really wiped the HR92 as well. Performing their hard reset. Otherwise they could be trying to address the old zone.
    getconnected.honeywell.com | I work for Honeywell. Any posts I make are purely to help if I can. Any personal views expressed are my own

  6. #36
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    Quote Originally Posted by Rameses View Post
    IM35461 - I agree with DBM - sounds like a rogue device asking for heat aligned with another 'zone' or instance. Log a call with tech support - they can put your system into monitor - and yes we can see heat demands. This is not available to the public (yet)

    livingroom2.jpg
    Oooh!

    Can you say if that will be available through a web interface (looks like it from your screen shot) or via the API, or controller itself ? Even if it is initially only just available through a web interface (and hopefully the API, since the API already seems to have a heat demand value that is currently unpopulated) that is a big step up on the current situation, which is unless you have an HGI80 with Domoticz, (out of reach of most people) no heat demand information is available to troubleshoot problems.

  7. #37
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    Quote Originally Posted by Rameses View Post
    IM35461 - I agree with DBM - sounds like a rogue device asking for heat aligned with another 'zone' or instance. Log a call with tech support - they can put your system into monitor - and yes we can see heat demands. This is not available to the public (yet)

    livingroom2.jpg
    My one is still doing it

    I have logged a support call

    Boiler Running After Heating Should Be Off Case Number 14758569

  8. #38
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    Quote Originally Posted by IM35461 View Post
    My one is still doing it

    I have logged a support call

    Boiler Running After Heating Should Be Off Case Number 14758569
    Time for an update....

    Well the heating still comes on when it should be off, seems to run the boiler for 2 minute sessions.

    Nothing yet from Honeywell support

  9. #39
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    I got a reply today from Honeywell but not really the answer to my question...

    Hi,

    I am contacting you regarding the issue that you are having with the evohome system.

    We looked at the data gathered from your system and some of the zones are overshooting (some not).The system is still new (6 days) so the system is still learning the initial room characteristics. We also saw that some of the heat demand periods are very short so the system will take a long time to adapt.

    Adrian Georgescu
    Tier 2 Technical Support Engineer
    I guess 6 days ago was when I tried to fix the issue and I was going to raise the overshooting in another post, in the morning the bedrooms are either cold or like an oven (well +1.5c, according to app than the set room temperature).

  10. #40
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    Now with the new firmware I noted the boiler was running 20mins after all zones were set to 7c

    So got out of bed and checked evohome screen.
    It said kitchen zone 7% and boiler 7% with screen showing 7c and HR92 also displaying 7c

    So where does the demand come from?

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