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My thoughts aswell 25kw might be a tad small

I suppose that depends on boiler manufacturer? Some are doing anything to get out of long warranties now. apparently

Do not move the top one. the bottom one but it should have an extension bar with a nipple on it to attach a pressure guage. Where has that gone ?

By the sounds of it, it's too late. They'd already done it.

Have you got a hot water cylinder

By the looks of it theres nothing there to do it

Your plate heat exchanger is blocked. Very common fault with the I's as the water ways in the plate are so narrow. Usually from dirty systems and/or systems being run on low pressure. You'll have to get an engineer to fix this. I'd imagine your boiler is still under guarantee so Worcester will...

Take the silver braided hose and attach it to where you have labelled and open the valves

The two valves with the brass blank ends on need to be connected with a hose and then you can top the pressure up

No a front on view of the pipes. I don't want to see the underneath of the boiler

Take a picture of the pipes underneath the boiler

You're looking for a braided silver hose connecting two pipes from the boiler together. They'll have valves on them

Sounds like the solenoid on your oil valve is dropping out when hot, or maybe the photo cell is sooted up. I'm not familiar with this boiler though

Hardly advice in DIY gas work.didnt tell him how to check it! But no you can't check or alter that your self. You'll have to get someone to check that who is competent. The older flues on these can crack internally.

********** Does your flue go up and out the roof or straight out the wall

When was the last time it was serviced

It It were a boiler fault I'd expect the blue light on the boiler to be flashing giving a fault code. Is your timer Honeywell ? As above kill the power and see if your motorised valve motors back and has resistance

Trust me, you can alter the pump setting down to as low as 60%.

If you think it's the pump you can try lowering the pump settings to see if it improves