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But not in the summer or when room stat is satisfied.

Pull the white plastic off. Some are held with a grub screw through the body so run your finger around to feel for a hole. Otherwise they are screwed in. You will need the water off to avoid excitement.

Stick your part no. in the search box here. They buy new boilers and strip them down https://ukboilerbreakers.co.uk/product/worcester-87161157410-main-heat-exchanger-gc-no-41-406-47-2

Oh yes in one photo the screws are gone. I would have loosened them and then you have something to put your finger and thumb on to spin the nut. Grips can be used but probably not required. Threads look nice and clean.

Loosen the 2 screws and the nut will only be finger tight

Chatter that you can hear if you put your ear to it or from the bottom of the garden?

With T. Rail off and 1 up rad turned to max.does it still chatter ?

What type of check valve is it and are you all thermostatic rad valves?

No, the pipe to shower head is irrelevant. No idea what showers you have, ideally it would be a bar shower mixer but it could be fully concealed with only push buttons available or an electronic one below bath. You may also have blending valves (tmv) fitted to wash basins or bath and a fault...

With your check valve in place this is as expected. If you fit a check valve to t.rail circuit all should be well but t.rail will then only come on with heating. If you can move the t.rail flow to anywhere between the pump and the 2 diverter valves you would have all year round operation and...

Its panto season so Oh no I didn't

Turn the towel rail off and I believe that everything will be fine. Let's start from there.

If there is a circuit there will be circulation. If you read again my last post it explains why towel rail reverses when hw on. It also flows through all of the radiators in the right direction. If you turn the towel rail off on your diagram you can then see the alternative route, backwards...

Run a shower on hot till the body is nice and hot. Turn off shower and open a cold tap. Cold running through shower valve will rapidly cool the shower body. The faulty valve could well be providing a secondary loop, circulating on gravity, which would deplete the hot water store.

Or fit a check valve to towel rail circuit and towel rail will work only with ch

On hw only, most return water will take the direct route from tee 2 to tee 1 but some will take the more complicated journey, backwards through the towel rail and forwards through every rad and check valve in the house. Probably not noticeable at rads but turn them all off bar one and you will...

On those Center ones (I hate spelling it that way) the secondary return tees into the cold feed. There is a horizontal pipe behind the cylinder and the hoover hides where it goes to. Does it tee into the cold supply pipe?

Is that a secondary return hidden behind the hoover?

It may be this one but if not there are several choices https://www.euroboilerparts.co.uk/puv-compatible-cable-for-grundfos-upm-pump-cable-fits-vaillant-0020221616-1823-p.asp

https://www.tapmagician.co.uk/NSAboutIdentifyValve.aspx