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Thank you MB I've always had them separate until this week. Just observing the radiator and HW temperatures by touch I'd be surprised if it were using more energy in the combined 1 hour than the previous 2 hours. Before HW 6am to 7am and CH 7am to 8am After HW and CH 7am to 8am The HW doesn't...

Just out of interest we’ve now got the HW & CH coming on together at 7am to 8am and it’s working fine. Thank you again for your help Ray

I think so - in a fashion - pressing the button at the side of the Nest Stat shown in an earlier picture puts both CH and HW on. While the tank stat would control the HW I'm not sure about the room temperature under these circumstances. I'm not sure where the actual thermostat is, but if the...

I need a way to resolve this if only to reduce the chances of our occasional valve buzzing happening in the night. I'll start by manually flicking the HW on for a few minutes last thing. One problem with the Nest is it only applies 30 minute intervals Thanks Ray

In our case with the 6am to 7am HW and 7am to 8am CH it also means the boiler water is is up to temperature when the CH starts. Having now tried them starting at the same time I might stick to it. I had my views coloured by having an Ideal Classic boiler, presumably holding more water than our...

I understand. This was my way of fault finding, in the absence of a multimeter and your in-depth knowledge of the valve wiring. I first thought it was the contact intermittingly not making it inside the valve head. It was certainly caused by the HW schedule being disabled somehow. I'd never seen...

Yes it’s no problem, I always had them separate until this morning. Now I know they are well balanced I might start the HW at the same time as CH 7am

PLEASE SEE PREVIOUS POST RE ORIGINAL QUESTION Not sure if my earlier picture gave the wrong impression of the pump orientation ? It's in a vertical pipe.

You were right Eric Recap ... System Boiler, Three way valve, Nest Controls Schedule ... 6am to 7am HW alone ... 7am to 8am CH alone Problem was ... The last few days the HW hasn't kicked in at 6am but would if boost option was used. Same again this morning, no HW response ... boosted for 30...

I hadn't realised the pump needed to be in a particular orientation ... how should it be, and why? Thanks Ray

Thank you for your help John, I’ll study that and report back later with this mornings results.

Thank you Eric, you wrote ... DHW powers the valve when NOT required ... if I understand correctly it may account for the occasional buzzing ... it maybe only buzzes on the occasion of the hot water getting up to the tank stat setting during the 6am to 7am time slot - which on most days it...

Yes the buzzing is a bit random and not sure what the circumstances need to be, it could start at 7pm when it changes from HW to CH but it might 8am when we notice it … we just flick the fused spur off and back on again to solve it.

Sorry for the delay … B to tank coil and A to return (?)

Yes, I always assume because we only have the HW on once a day for an hour the tank stat will allow it to start 23 hours later. What I’ve never checked is whether ours ever gets up to the temp set by the stat … 65 I think

I understand, yes it’s just the last few days it’s not kicked in at 6am

Thank you, sorry for any confusion … my only issue is … the hot water isn’t coming on in a morning as set by the Nest schedule 6 - 7am HW only 7 - 8am CH only if below temp

We already had the CH on when I went to check them both together. Turned the HW on using the App. Strangely this affected the boiler sound … it seemed to go quieter. Without a tester I couldn’t tell if the valve was favouring the HW … the rads seemed to remain the same. Before checking I was...

I’ll try that … I’ve always imagined the HW would take priority if they were both on together but I’ll check that out now and see what happens.

Our Nest schedule never has CH & HW on together. Last action was CH on then off this morning. Went into loft with Nest App CH on for a few minutes - turned off - waited 3 mins for afterrun to stop each time. HW on for a few minutes - could hear the valve action - turned off CH on - could hear...