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trying to help anyone wi a similar thing anyway why did you look and reply if its that old ignorance is not everything

sounds similar to me no safety valve but when dhw turned off pressure goes over 10 bar(gauge max) no expansion on system when this was happening so had 2 blowouts on flexi hoses instlled 8 litre exp and seems to have cured pressure prob although boiler runs on a little longer to fill vessel

exp vesel has calmed things down max now about 2.7 bar how many have this pressue without knowing?

now have 8litre expansion connected turn off tap now and burner stays on until pressure at 2 bar then shuts down when the flow into the exp vessel slows expansion continues and pressure goes to about 2.7 sorted methinks but will still fit a safety soon at 3 bar

I also thought that ie it would all balance at mains pressure if i fully opened the prv. no check valve. except on filler loop to CH which is on the boiler side of the prv tonight replaced the diverter valve diaphragm but although the pressure built up slower it still went over 10 bar...

boiler shuts down immediately the tap is closed mains is about 7 bar (cold)but as i said only 3 to 4 bar infeed to boiler through prv (adjustable) transient pressure sounds plausable how do other systems lose their latent heat and therefore pressure to prevent this? any input welcome ...

no water meter no expansion direct from combi to taps Exceeding 10 bar(gauge max) to blow flexi prv on intake 3 to 4 bar diverter valve fault? as pressure showing at prv over 10 bar when tap first turned off am I corrrect in thinking the diverter valve should lose this pressure by...

who knows what their domestic hot water (dhw) pressure is as they turn off a tap? i have found out to my cost that it will exceed 10 bar the guage needle was bent! who has a gauge on dhw? turn off and pressure rises dramaticallly. only a blowout twice on a flexi alerted to this all...

thinking faulty diverter valve, although burner goes off immediatly the hot tap turned off possibly diaphram? or possibly heat exchanger as static pressure rises with CH on turning tap off very slow helps pressure leaaving one tap very slightly open as a temporary relief as this reduces...

Ravenheat rsf84et dhw pressure going over 10 bar when turned off runs at 2 bar 4 bar static through prv (when cold) no water meter

does domestic hot water supplied by a combi boiler require any expansion vessel or safety valve ? excessive pressure on system when tap closed due to latent heat in boiler causing expansion!?! may have been like this for some time boiler or system fault?

its working as it should (both appliances)