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Thanks for the clarification. Interesting that there was no bang issues with the old system but I’m so glad it’s sorted now. Not to keep expecting noises every so often is saving my nerves!

Thank you. Obviously the original plumber from 20 years ago had wired it incorrectly and that wasn’t changed when the new boiler went in.

OH to Dylan_t42 here. What’s a HL stat for reference?

Ours was a slightly different situation which took ages to solve as pretty much every other post talked about a bang when the CH shut off. Our system is a 3 port valve model with a separate 2-port safety valve for the Megaflo HWC. We eventually worked out we had a build up in pressure at the...

OH is in the process as I type :) Just very peed off at present listening to intermittent bangs which when I'm next to them cause me to jump!

I have the opposite when the 2 port valve opens! Frustrating and annoying and I can't find anything about it on any forum

Just come across this. How did it all go? Any issues?

Not sure if you've solved your issue but we've had similar in one of our kitchen P10's. Chap today pointed out that the exterior sticky butyl seal between the glass and its covers (under the exterior casement flashings) has broken down, which leads to water ingress to the inside and that...