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Further to this then, if water is disappearing and no external leak then suspect head gasket/ head / block crack. You can get UV dye to put in coolant but before doing this check oil filler cap with uv light to see if the oil you use lights up under UV. if not then good as it may prove water...

Here is how the discharge pipe should be.

BTW the 3 program times are there to take advantage of cheap electricity like if you were on economy 10 tarrif.

Sorry to say I think you have been conned. If the old valve on the cylinder was letting by then a replacement valve should have been sourced. Was the old one the same size with 2 heating elements? if only the top one is working due to either incorrect wiring or fault then you will not be getting...

cancel my advice, you have a different problem to the OP. As others have said get someone out

Bottom element looks like no cable clamp. Perhaps switch it on and look at meter and see if it is drawing circa 6kw an hour so take reading for 10 minutes and divide by 6. BTW the time you are leaving on is not enough if any meaniful draw off. Times were set that way so if you have economy7 then...

Take a photo of the plastic pipe work by the tundish in particular any markings on it. How is the feed to the elements wired? To one junction box how is it controlled, normally you would have 2 options full tank or half a tank.

Who installed this? Looks very much like an elbow before the prescribed distance form the tundish. Also looks like plastic so hopefully the correct rating? Maybe only the top element working so not getting a full tank but looks like an illegal installation!!!

Guessman has took the guess work out of it. Dont worry abut running costs of the pumps that is negligible in the scheme of things.Do come back with the price. If too much then you ma need to fudge it, with the various options ,non guaranteed as we dont fully know how the logic works on the boiler.

The timed relays are cheap and can work in various modes (including delay on if you get the correct one). I have used them for pump overun duties just mounted in a 1 gang pattress.

These guys will make you one. http://www.vaheating.co.uk/headers.html

How much is it going to cost to have a LLH, maybe time to get a new boiler which is a bit more tolerant to what you are asking. Maybe fudge something with 3 port valves as another option with a timer like...

Does L8 make a provision for unvented water storage (plus 50c at the taps will be a bit hotter at the cylinder)? For OP so there had been some draw off in the day surprised that it cut out so quickly on return sensing, but was worth a go. Does it behave differently depending on d.0 as maybe you...

how did you get the boiler to call for heat? Hopefully not by cranking up the cylinder to an artifically high setting without actual draw off as the boiler will mis-behave if you try that :-)Is it an unvented cylinder? What is your normal setting remember they have quite a wide range I find if...

return sensing is took from the NTC's so it will operate the boiler based on the sensor that reads the value for d.41 rather than d.40 it is just a binary setting in the normal service menu IIRC.

I get no S.53's under any scenarios. Yes it was around 4 to 5 years ago that I done all the research into the odd logic of the boiler and do remember your thread. I think a few heating engineers finally agreed on the logic issues around this boiler. I have read someone else saying that there is...

Unfortunately the logic on this boiler is a hodge potch affair. I would say most systems would have the same behaviour when DHW has called for heat and then CH calls so does appear on the face of it that something is amiss. I havent seen the problem. What is d.0 set to I think there is some...

What are the actual D.40 and D.41 values? Is the S.53 after cold start? How old is the PCB?

S.53 will be satisfied as soon as the logic is happy with the Δ between flow and return I believe.

not sure what the question is but here is what d.2 is