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Is the warm air new or at a similar age to the cylinder?

:rolleyes:Youve said it now someone will start ranting about "wooshitter" and how they are made of plastic. And how intergas are the best thing since sliced bread.

https://www.theheatxchange.co.uk/sku_BAX5111137.html?gclid=Cj0KCQiAiKrUBRD6ARIsADS2OLmUX8XfzSXeT03GfhqjoH40teDGOnmQrkavYu_uxQELoS8cEO99C1waAr9SEALw_wcB

Quite likely to be just the diaphragm. Whip front cover off. Turm on hot tap you should be able to see the pin come out on divertor and make the switch

It needs properly diagnosing. anyone who says its the gas valve without doing some basic checks is just guessing im afraid

Engineer job im afraid. Always worth checking there is gas on you would be suprised the number of callouts i get to tenanted properties where there is a fault to the card meter or the ecv has bern turned off when putting shopping away etc. Oh and the other favoutite turning the gas off at...

Its a sign the pumps getting on a bit but try clipping said pipe and bang some inhibitor in whilst your at it.

Agree with fezster here. Fit a gate valve on hot water circuit and get mv working correctly. Before anything else.

Their is a lot of info to process here, and as im sure you appreciate its over the internet. Has it ever worked perfectly or has it gone worse over time? The basic set up sounds fine. Turn the cylinder stat down and check the motorized valve shuts down then open cylinder stat up and recheck that...

Sometimes its as simple as they havent fully opened the stop tap back up after installing check this first if not done already.

The downward facing 15mm copper pipe is the blow off.

Do you mean isolate as in turn off appliance or turn off flow and return to boiler? The pressure will fluctuate dependant on if the boiler is on or off as hot water expands. Have you checked the blow off pipe outside and around all the radiator valves

Yes its a bad idea. Spend the time and money or you will regret it.

from reading your post it sounds like you intend rto tap into your boiler condensate ? If this is the case it wouldnt work im afraid the dishwasher should be in 1 1/2" waste pipe. Can you not go straight through the wall and run the pipe to the drain externally?

A stop gap procedure would be to half empty a radiator to allow for expansion would confirm your suspicions also.

Ive never seen one like it im sure someone on here will have though. You would assume its an automatic air vent just a nicer looking one than most as it is in show.

Its not a boiler i usually work on so not familier with all its foibles. Did he check the new expansion vessels pressure after fitting? To make sure there was enough charge in it. Or just assume it to be at the correct charge. Its a very unlikely set of events that would lead it be the shower...

If youre unlucky enough to get engineer 1 or 3 back ask him how the water gets around the secondary heat exchanger? If your proficent with electrical testing equipment check there is a live to the pump when their is some demand on the boiler.

Without carrying out various test its hard to diagnose over the internet but it sounds like the pump to me either the pump itself or its getting a intermittent supply via the wiring harness or pcb.

All those parts and the pumps never been changed?