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Thread: Evohome Hot water problems

  1. #1
    Automated Home Jr Member
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    Oct 2014
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    Default Evohome Hot water problems

    So this is the 2nd evohome system I've had and the first time i've used the hot water kit, Previous house we just had a combi boiler

    First off getting the hot water kit installed was a nightmare as we couldn't find an installer in south wales. Eventually though using the forum and some help from evohome shop I got it up and running which it worked fine for a week or two until...


    I could hear the tundish activating on the cylinder. Looks like the temp wasn't reporting correctly from the sensor back to the boiler and i thought this was solved by moving unit to a better position in the airing cupboard

    Again this morning i could hear the tundish dripping and after i popped the batteries in unit the temp jump straight away so it looks like the temp isn't being reported correctly back to the controller. As i work offshore my wife tells me this is actually a regular occurrence

    I've tried moving the unit, changing the batteries and also playing with the battery tension

    From looking at the past history it seems the hot water kit is very temperamental

    Any thoughts on what to try next?

  2. #2
    Automated Home Ninja
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    Mar 2017
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    I've had a faulty one before now, swapped out and seemed much better.

    Batteries have to be around 1.6v, soon as they start dropping south to 1.5v unit plays up.

    Make sure battery tensions are tight and repair with Evohome.

    Have you not left the Cylinder Stat/High limit stat wired in so if it fails the system cuts out anyway? It's a requirement of regs.

  3. #3
    Automated Home Jr Member
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    Quote Originally Posted by mtmcgavock View Post
    I've had a faulty one before now, swapped out and seemed much better.

    Batteries have to be around 1.6v, soon as they start dropping south to 1.5v unit plays up.

    Make sure battery tensions are tight and repair with Evohome.

    Have you not left the Cylinder Stat/High limit stat wired in so if it fails the system cuts out anyway? It's a requirement of regs.
    i've tried changing the batteries for some duracells still the same problem thought

    Stat/High limit is still wired in, i left that part all in place

    Maybe the unit is faulty which is annoying as it's not very old

  4. #4
    Automated Home Ninja
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    Quote Originally Posted by crh View Post
    i've tried changing the batteries for some duracells still the same problem thought

    Stat/High limit is still wired in, i left that part all in place

    Maybe the unit is faulty which is annoying as it's not very old
    Your discharge shouldn't really be dripping then, the Safety Valve will only blow off at 90oc and that's highly unlikely as one, your boiler would struggle to get to this and two, either the existing cylinder stat or high limit will be kicking in. Sounds like it's letting off on pressure, so sounds like your unvented wants a recharge...

    In terms of not receiving updated temps, when it's unresponsive if you press the button on the front of the HW receiver does the panel get an updated temperature?

  5. #5
    Automated Home Legend
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    Quote Originally Posted by crh View Post
    So this is the 2nd evohome system I've had and the first time i've used the hot water kit, Previous house we just had a combi boiler

    First off getting the hot water kit installed was a nightmare as we couldn't find an installer in south wales. Eventually though using the forum and some help from evohome shop I got it up and running which it worked fine for a week or two until...


    I could hear the tundish activating on the cylinder. Looks like the temp wasn't reporting correctly from the sensor back to the boiler and i thought this was solved by moving unit to a better position in the airing cupboard

    Again this morning i could hear the tundish dripping and after i popped the batteries in unit the temp jump straight away so it looks like the temp isn't being reported correctly back to the controller. As i work offshore my wife tells me this is actually a regular occurrence

    I've tried moving the unit, changing the batteries and also playing with the battery tension

    From looking at the past history it seems the hot water kit is very temperamental

    Any thoughts on what to try next?
    I have been using Evohome with the hot water sensor and relay for 5 years and not had any problems other than needing to replace the batteries a little more often than with the HR92 head units although that is not so bad since I ensured there was more tension in the battery compartment to hold the batteries. A common issue with both the control panel and HW sensor.

  6. #6
    Automated Home Jr Member
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    Oct 2014
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    Quote Originally Posted by mtmcgavock View Post
    Your discharge shouldn't really be dripping then, the Safety Valve will only blow off at 90oc and that's highly unlikely as one, your boiler would struggle to get to this and two, either the existing cylinder stat or high limit will be kicking in. Sounds like it's letting off on pressure, so sounds like your unvented wants a recharge...

    In terms of not receiving updated temps, when it's unresponsive if you press the button on the front of the HW receiver does the panel get an updated temperature?

    Thanks for the info and that's really good to know,

    do you mean regenerating the bubble?

    If i press the button on the front it flashes green and red and i think the temp is updating

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