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Thread: Evohome CS92 troubles

  1. #21
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    I seem to be experiencing hot water overshoots again as well.

    After over 6 months of intermittent overshoots that I couldn't solve I actually had my CS92A replaced under warranty a few months ago, and at first that seemed to fix it - no overshoots for several months.

    But I'm starting to see them again, and absolutely nothing has changed in the house in regards to Evohome layout or configuration or other wireless devices.

    It's not overshooting as far this time, but my hot water is set to 54 and I'm seeing 56, 57 degrees on many occasions and often it feels a lot hotter than 57. (EG too hot to hold your hand under)

    With the amount of effort I've taken to analyse and troubleshoot this problem in the past (see long past threads devoted to it) and the fact that I'm now on my second CS92A and I'm having problems again I have to conclude that there is something wrong with the design of the device making it far too "finicky"...

    It does feel like it is related to the battery saving algorithm where it takes extreme measures to only send updates as infrequently as possible, however that seems to backfire under certain situations leading to overshoots because it doesn't send an update as the target temperature is crossed.

    A bit disappointing, it definitely seems to be the weakest part of the overall system and for no good reason - you'd think that a simple temperature sensor running from two AA batteries could have a good battery life without such extreme and problematic battery conservation measures, when an HR92 that is frequently turning a motor still manages to last 18 months.
    Last edited by DBMandrake; 23rd February 2018 at 10:06 AM.

  2. #22
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    You can understand why there is a big important notice about making sure the original thermostat and wired pump/heat cut off is left in addition to the CS92.

    The number of hot water cylinders blowing their pressure releases if they relied solely on these CS92's would be interesting.

    Its just the same as their reason for not building a range extender "the market just isn't there". The number of people with CS92's that are experiencing issues will be minimal. Even mine faulting several times a week doesn't cause issues unless it coincides with a heating cycle to the extent it leaves us without hot water in a morning, which has "only" occurred twice in 5 months, even though I get comms faults with the CS92 almost every day.

    So while there aren't people complaining in great numbers, they aren't investing in the fix.

    Whilst ever there aren't enough people suffering from range related issues, and can either scrape by with an extra controller (or two), then why bother investing in that too.

  3. #23
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    Quote Originally Posted by Cchris View Post
    You can understand why there is a big important notice about making sure the original thermostat and wired pump/heat cut off is left in addition to the CS92.

    The number of hot water cylinders blowing their pressure releases if they relied solely on these CS92's would be interesting.

    Its just the same as their reason for not building a range extender "the market just isn't there". The number of people with CS92's that are experiencing issues will be minimal. Even mine faulting several times a week doesn't cause issues unless it coincides with a heating cycle to the extent it leaves us without hot water in a morning, which has "only" occurred twice in 5 months, even though I get comms faults with the CS92 almost every day.

    So while there aren't people complaining in great numbers, they aren't investing in the fix.

    Whilst ever there aren't enough people suffering from range related issues, and can either scrape by with an extra controller (or two), then why bother investing in that too.
    I know that I am tempting fate here, but I have had significantly fewer CS92 comms issues after the CH BDR in the airing cupboard was disabled in favour of an OT bridge located near to the boiler. I occasionally get a small temperature overshoot but it has never been much more than 1 to 2C.

  4. #24
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    Quote Originally Posted by HenGus View Post
    I know that I am tempting fate here, but I have had significantly fewer CS92 comms issues after the CH BDR in the airing cupboard was disabled in favour of an OT bridge located near to the boiler. I occasionally get a small temperature overshoot but it has never been much more than 1 to 2C.
    Sadly, moving controls closer to the boiler would cause me the issue of it not being in range of the controller. If I move the controller, then that is no longer in range of the furthest radiator it controls. Third world problems of having a larger home - its not very deep but quite wide, and the boilers are more to one end than the other. We have a twin boiler setup with low loss header too, so I can imagine that opening a whole separate can of worms. Honeywell just need to admit fault with these CS92's and update the hardware/software to fix these issues.

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