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Very good, didn't read the posts properly, but whatever, if the burner runs for awhile just test for the pump spindle turning or not.

That Selectric is a pretty old pump, just do as suggested above, when system cools down enough to reset the hi level temp trip just get a call for heat and immediately remove the pumps vent screw and stick in a small screwdriver to touch the end of the pump shaft, at least you can determine if...

I read somewhere where someone installed a 5L charged to 2bar with a mains pressure of 5bar which apparently worked.

I have seen posts where replacing them did apparently get rid of the problem but obviously no guarantee. What vol is the under sink shock arrester?, You say? the 3bar pressure doesn;t change with the mains isolated or not, I would suggest reducing the charge pressure to 2bar as that will act in...

It can be very difficult sometimes to pick the right location for the shock arrestor, have you checked the one under the sink, ensure that there is air at the air end and that the diaphragm hasn't failed and it's full of water, also test it's pressure, if possible with mains isolated and...

So you've seen my edited post above?, ie the balanced cold is taken from the multibloc?

The Cylinder EV is purely for accomodating the expansion volume when the cylinder heats up, it may help to dampen water hammer., there is a non return valve in that multibloc which prevents any backflow through it, a shock arrestor (EV) should have a unristricted connecting pipe to the mains or...

One would think that opening and closing cold water taps shouldn't cause the multibloc to then cause a problem, you could install a shock arrestor on the cold water supply, but you need to know the mains pressure in order to set the arrestor vessel charge pressure

Not much more you can do so, it is of limited value as it only proves that the mains pressure after the PRV is 3.0bar or less, only other suggestion is to ensure no one runs off any hot water when the cylinder is reheating and towards the end of the reheat period check the pressure again, it...

Ideally, the PRV set pressure should be set to the (dynamic) mains pressure with a big HW demand, your pressure may only be 2bar or so, it might even only have a static pressure of 2bar (even if unlikely), even so, the air end pressure will rise while heating takes place as water is...

Did the check the PRV (pressure reducing valve) pressure and setting, this is usually set to 3.0bar, you can do a few tests yourself if so inclined and you have a tyre pressure gauge. Shut the mains isol valve before the multibloc and open a hot tap to depressurize the cylinder, attach the PG to...

What about your "Whistling TRV" post #3??, is it still whistling??

Is the ABV setting still set to 2?.

Suggest leaving that rad as is because you do need a minimum flow which may not happen if all rads are TRVd, unlikely that all will fully close at the same time but you never know?. I installed a normally open motorised valve in place of a ABV a fair few years ago for a friend, it closes as...

Yes, but when the CH zone valve closes does it also stop the circulation in that rad with no TRV?, if it does, then no good, because the main purpose of a ABV is that it allows circulation to cool down the Boiler HEX for a few minutes with circ pump overrun, does the circ pump run on for a few...

I think its almost universally accepted that 1 meter = 100 mbar so if one reads the scale as meters then good enough? since the pump head is normally in meters.

There is a problem with using a ABV (automatic bypass valve) with most modern A rated circ pumps in that the pump head doesn't fall off rapidly when the flow demand increases or more importantly doesn't increase rapidly when the flow demand (like zone valve or TRVs closing) decreases, you can...

Not familiar with the 145 but clockwise yes to increase the lifting head.

That's correct, yes, the index is in meters, M, I thought they were in (decimal) bar.

You should still be OK at that setting, if all rads not heating or very slow then press the button to get one green + one orange LED, that gives a 5.2M head and hopefully not too much noise, I would also increase the ABV index setting to ~ .35 to .38 (3.5M to 3.8M) after reducing to speed I, if...