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Teeny update. Checked connection at PCB and at store and it worked for a short time, so new thermistor ordered. However, where it sits seems full of muck, which I can probably clean with a cotton bud or similar. Is this normal? And I take it the circlip just holds the wire and nothing else!

DHW LED flashing couple of times a second. Grant's docs suggest the ‘Store’ thermistor connection to PCB, or possible store thermistor. Any thoughts?

Here

Had the same issue and bought from Aliexpress. Hope you're not in a hurry...

Further to above, towel rails are fab for adding inhibitor!

Notes

I've no idea, sorry, but I suspect folks will ask for appliance details.

Council tip, maybe, but you'd better be quick!

The pump runs but is cold and the burner fires and boiler doesn't overheat? Hmmm... Maybe one of the valves is shut or partially shut?

Did you change the correct pump? Re venting, you can splash the pcb board if not careful.

Still sounds like pump. Is it getting power/spinning when DHW is on?

Does it matter and have you the time? I mean, you'll need an 'any old tap' to use while warring with the Screwfix legal bods, which can take light years. Good luck though! :-)

Hiya I'll PM you. ;)

Agreed, but skilled tradesfolk in remoteland are impossible to source, so I have to learn new skills - even if I don't want to!

I want to check the pressure on a Grant Vortex Riello burner, but can't find any info on residual pressure; eg if I remove the test-point Allen screw, will it spit out 8 bar of kerosene all over the utility room, or does it only work up to that pressure when running? Thank you!

How old is it?

I'd only want it for a day. I think Jewsons hire them too, but I wondered if I needed to be in the trade.

Can I hire an oil pressure gauge and gas analyser, to adjust after changing nozzle, or is this forbidden?

Update. PRV shot and both expansion vessels had zero pressure. Working great guns now! :-)

Re the expansion vessel, I have two, the boiler one and an external. So I'll check both. I've been quoted .8 bar for the vessel and 1 bar for the boiler. Does that sound correct? Also, do you think the blue handled valve will start leaking when disturbed? Many thanks and apols for all questions!