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The plumb center trade fix are myson contract body's. The plumb center heads look better. I believe they are made by myson. I like them and fit them regularly, also come in trv and lockshield pack now

Good to hear it's Working. Its always nice to get an update

If you have an ideal response chances are it won't last long, not seen one for years, they became obsolete very quickly. A decent cycle pump with gauge will do the job. Just make sure heating side has a drain off open when you pump the vessel up.

My BIL has done just that at a total cost of approx 3k

They was a good boiler worth repairing, recently the spares prices have shot up rendering a lot of repairs BER unfortunately

That's not the boiler he is talking about, that is an instant

RTFM

The rear most on top is not a CH micro switch, it proves the pump is running and has to prove on HW and CH

Jam a driver in to prise it open

Don't link together just cap each end individually

Is there a radiator symbol on the boiler display when the stat is calling for heat? It's likely the reciever is not sending power back to the boiler, you can check s codes to confirm or use a multimeter on reciever

An e133 fault has nothing to do whatsoever with an expansion vessel/prv problem. I have never seen a wet pcb cause an e133 fault either.

I have swapped a pcb for this fault

Change the hydraulic venturi and diaphragm both parts for under 20 quid. Does the hot water tap light go on and off on shower demand?

Good luck returning a pcb!

Primary thermistor issue I would say

Whilst pressurising the vessel, wait for system gauge to read 0bar.

I would add that to change it, it's easier with the burner section removed so a new seal kit would be needed aswell even so 250 is expensive if that's all he's doin.

Plus 1

You guys must be unlucky, I swap the o rings regularly on these for a drip in that location, 2 screws and thats it. There is actually 3 or 4 o rings (dependant on age) as the connection from block is on a barrel nipple that pulls out.