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Yes, I would try that, it won't cost the earth.

Looks like there may be another NRV just before the PG. Just open the outdoor tap and the kitchen tap fully but slowly and note the pressure, it should fall, even if only by a small amount, then shut both taps very slowly and ensure the pressure returns to normal. I would install a 2L EV...

Ensure measurement is between live(s) and earth first and then lives to neutral.

Don't know if your gas? boiler had/has a external circ pump and if it had been renewed with a Grundfos UPS3 at any stage previous to the air problem, the UPS3 is dispatched set to its highest setting of 6.4M, not only that but this very powerful pump will circulate over 18LPM and still almost...

Strangely enough, or maybe not, I had a 9.0kW Mira Sport for ~ 18 years, now replaced with a 9kW Triton T80Z, due to ongoing external waterworks the mains pressure was frequently quite low or non existant for hours each day so I installed a lever valve (with a DCV at the mains), to use the...

The TCO contains two sets of contacts, wired in series, one set of contacts open when/if the water temperature reaches 48C and is self resetting, the other is set to around 72C, if that opens then the TCO must be renewed, (and fault found). the 48C set can be heard operating every time you...

Not sure what you mean by the above, its the air end pressure you are checking and setting so losing the water side pressure is correct and the only proper way to check it, what pressure have you set it to with the water side disconnected?.

Off the mains may work.

I honestly didn't think cleaning the strainer would do the trick, unfortunately.:cry:

Surprising that the strainer blockage wasn't reflected in poor cold and HW flowrates, this reminds me once again of one of the world's greatest mysteries, that unvented HW cylinders don't have pressure gauges.

I would suggest you definitely determine the mains pressure, you should be able to this with that miny arrestor, shut off the mains, open a low down cold tap, disconnect the arrestor pipe, check the air end pressure, if its 3 bar reduce it to 1bar, reconnect the pipe, reopen the mains after...

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...