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Last seen: Oct 21, 2026
Yup, or better still turn down the lockshields in the bedrooms so you dont need TRVs there either If you need time-variable temperature in the bedro...
I agree with @gary. You need to go back to basics and get it working with weather compensation as the principal/only control and other external con...
@alfapat I hope you are getting closer to the optimum adjustments. Ive given some thought to how you can operate the optimised system with Cosy. ...
DHW flow temp is completely separate to space heating flow temp. The offset is added to the target DHW temp to get the FT for DHW. 15K should be amp...
Interesting. I must admit Id be very reluctant to get a different model to the one I need because of a known software problem, assuming Vaillant adm...
OK so downstairs is 'after' upstairs. You may have to throttle down the LSVs upstairs, increase the pump head if thats an option, and open up (if you...
Something is wrong with the plumbing for sure. Have the downstairs rads been bled? Are they on a separate primary or do they share a primary with th...
Im not an Ecodan exert but I would say that the first picture confirms its cycling, roughly every 15 mins If its about 8C outside, which the BBC sug...
Can you post some plots so we can have a look please? At present many heat pumps will be defrosting (which can look like cycling) because current te...
@ivanhoew I must say I echo what @cathoderay is saying here. I hope what Im about to add doesn't offend you (and apologise if it does - its no...
Good you are making progress. It sounds like the internal noise problem is fixed, just in case it's relevant it took 4 weeks for all the air to come ...
Good. Please post any outcome and be persistent with Vaillant. I think you may have a particular problem, but even the 'commonly reported' increase ...
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Latest Posts
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RE: How much of your renewable and home setup would still work if the internet went down?
@scrchngwsl It can be a bit worse. Much software ...
By Batpred , 40 minutes ago
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RE: Indevolt Batteries UK Support & Info Thread
Also.. It saw cascading effects worldwide: taking ou...
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Neso website not critical enough to be brought back up ...
By Batpred , 3 hours ago
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RE: How quickly would you want/expect heat recovery to take from setback?
Much longer than that here. The heating isn't even on. ...
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RE: Passiv Smart Thermostat - Help & Forum Support
Obviously the weather is changeable but there's a defin...
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RE: Double or Triple Glazed Windows?
It is very comforting to see the condensation on the ou...
By Toodles , 8 hours ago
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RE: The Changing Jet Stream Could Challenge UK Air Source Heat Pumps
@rob-of-york I must admit that when we had a Daikin hea...
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RE: Forum updates, announcements & issues
Get the Renewable Heating Hub heads-up on WhatsApp. I...
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RE: Safety study for plug in batteries out to tender - looks like Q3 2027 at best before legal
@editor I pointed out to the one of the Fuse execs that...
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RE: 15kw pump for 225m2 1990's house - over kill?
@seaviews As well as loft insulation, there are othe...
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RE: BT cuts you off, Plusnet blames Openreach... welcome to “seamless” broadband switching
Both of which (in most cases) use Openreach for the las...
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RE: Renewables & Heat Pumps in the News
Yes, this is a swiss and german standard I believe, Vai...
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RE: Octopus Cosy 12 Heat Pump Regret: Incredibly Loud, Poor Heating & Constant Hum - Help!
@editor FWIW my problem was resolved, eventually, after...
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My heating has been off and DHW on throughout the summe...
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RE: Anyone concerned about GivEnergy?
The GivE forum seemed to have survived the collapse of ...
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