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  1. Replies
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    I have a Main and have an X plan. Evohome...

    I have a Main and have an X plan.

    Evohome does differentiate between HW & CH. When my Opentherm requests HW reheat, it demands an 80oc flow temp. On CH it modulates to what it likes, which is...
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    Doesn't work well with Opentherm. I ended up...

    Doesn't work well with Opentherm. I ended up changing my NC Motorised valve to a NO one as per the old system before the Firmware update.

    The issue is Opentherm fires the boiler for low flow...
  3. The only reason I said Baxi was their boilers are...

    The only reason I said Baxi was their boilers are OK, and they work well with Opentherm. The new 600/800 series are good little boilers, and i'd have one in my own home.

    I don't mind Worcester....
  4. Personally as an installer I wouldn't have...

    Personally as an installer I wouldn't have Intergas or Ravenheat.

    Your issue with the big manufactures like Vaillant and Worcester want you to use their own control systems.

    Baxi invested...
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    Using Gas, different ones operate differently....

    Using Gas, different ones operate differently. Some use the plate heat exchanger, other's work a bit like a traditional system then switch over into combi mode.

    IMO they're a waste of time. You...
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    No, unfortunately not.

    No, unfortunately not.
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    My go to would probably be a Worcester HighFlow...

    My go to would probably be a Worcester HighFlow 440/550, or a Vaillant EcoTec Plus 938. Although the Vaillant's tank is only 20l so tbh I don't think it gives you any benefit over the 838.
  8. Let me know how you go on. In terms of...

    Let me know how you go on.

    In terms of savings, I think i've saved 30% in gas over the last week. Doing readings over a longer period to see how it goes.
  9. Ended up fitting a NO Motorised valve to sort the...

    Ended up fitting a NO Motorised valve to sort the issue. Shame it couldn't be sorted software based, as in my eyes it's a relatively straight forward fix.
  10. Thanks, as I suspected. Glad it isn't just mine,...

    Thanks, as I suspected. Glad it isn't just mine, just defeating the object of OT and HW priority features.



    Yes it does indeed. My boiler is firing with a low flow temp and with nowhere for it...
  11. No it doesn't. Some of the larger models do, but...

    No it doesn't. Some of the larger models do, but if you wanted to use an additional pump you'd just usually wire it to the S/L from the motorised valves.

    It manually open should be fine for now....
  12. Have you checked to make sure your CH valve is...

    Have you checked to make sure your CH valve is actually open though? Just out of interest.

    As I say the boiler works fine, just it canít pump the heat anywhere as the CH valve stays closed below...
  13. Yeah I canít do that using the A B C thatís my...

    Yeah I canít do that using the A B C thatís my main issue, other than hold the valve open 24/7 with 240v which will knacker it in. So itís clicked open manually.

    Before you could get it to open...
  14. So tried unpairing the Opentherm receiver, Load...

    So tried unpairing the Opentherm receiver, Load Scaling was already disabled. Repaired, and it's doing the same. As I say specifically when the loads are below 20%.

    My only way around it at the...
  15. The main issue is once you've paired the...

    The main issue is once you've paired the Opentherm Bridge it removes all the options of the Load Scaling features that came in the new update. I may try unpairing it and seeing if it allows me to...
  16. I suspect it has something to do with TPI....

    I suspect it has something to do with TPI. Although in this case the Opentherm bridge isn't the issue, it's the CH relay that is. So in theory when its acting as a CH relay for HW priority it should...
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    I drop mine to 16oc at night, which it very...

    I drop mine to 16oc at night, which it very rarely gets to. I usually sits at around 18/19oc at night. It is a very well insulated house though.

    I've actually done extensive testing with ours,...
  18. Thanks. It's a S plan system with the CH and HW...

    Thanks. It's a S plan system with the CH and HW bound under system summary as 'Two 2 Port Valves'.

    The system is about 4 years old. I've upgraded to a Opentherm boiler, so I unpaired the old...
  19. Opentherm and S Plan with Evohome HW priority

    Anyone got the above set up? So Opentherm Receiver, CH relay and HW relay (To use the built in HW priority features of the newer software).

    Got an issue with the Opentherm receiver and CH relay...
  20. On a sealed system such as a Pressurised cylinder...

    On a sealed system such as a Pressurised cylinder it's very unlikely to get Legionella, also the water would have to be heated constantly and not drawn off for long periods of time such as weeks...
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    Faulty wiring or stuck valve. Your volt pen...

    Faulty wiring or stuck valve.

    Your volt pen will show a live as they have a perm live going to them for the microswitch. You'd need to see if there's 240v on the Brown wire to the motor to work...
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    Yes they have a manual override. Some valves will...

    Yes they have a manual override. Some valves will stay perm open if you operate the lever. That maybe your issue, but hard to say if you don't know the make of valve. Maybe a picture might help?
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    You'd need to test if there's power to the valve,...

    You'd need to test if there's power to the valve, and check whether it's been locked open. Is it a Honeywell Valve?
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    Sounds like it's wired up wrong, especially as...

    Sounds like it's wired up wrong, especially as that the High Limit stat on the cylinder should be still wired in series with the zone valve. When the heatings calling it sounds as if it's heating the...
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    Don't think anyone really ever adheres to that...

    Don't think anyone really ever adheres to that rule :rolleyes:
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