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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!

What are these like to change, please? Looking down on it, unscrewing it looks like it'll catch on the aav (which was silly-tight when replaced by an engineer). Also, if depressurised, will removal still create a 'gusher'? (This is a bungalow, so no additional 'weight on water.) The history to...

Hiya pump was replaced with DAB and works fine and I was just double checking which setting to use, as engineer and DAB said one and Exedon and Grant another; so going with latter, a constant curve. I don't really understand the 'curve' bit. Does it curve as the water heats and pressure rises...

DISREGARD! Spoke to Grant today and Exedon info was spot on! Ta again.

Thanks both. Fixed now. (Pump).

Hi and no. I didn't want to start opening control panels and/or removing and inspecting the pump without a replacement. I know there's a slight chance I'll stumble across a fix, but would much rather stick a new pump on and forget all about it.

Hiya and thanks I tried it again and it overheated in about three mins. Hot water flow is very good (although it's cold!) Is this the pump and is it a direct swap? I wondered if it was too powerful. dhw pump

Morning and thank you. I'm told the pump's obsolete and can't speak to Wilo or Grant either as closed for Xmas... Have you a link to the pump you use, please? I'll order one.

Hi and thanks for reply. I ran it for three mins and all the chromed pipes, exchanger and pump itself were cold. Top outlet at boiler was warming up, which I guess you'd expect if the boiler's ignited. Turned it off again as figured it would overheat again. I ran the hot tap for a couple of mins...

Thanks for reply. I can feel the pump spinning but have read the impeller can become detached! Also that the pump's no longer available. Is there any point in having a look inside without a replacement to hand?