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Thank you. I was really hoping this might be the answer as I haven't checked this (although I presume all the plumbers would have done) but no, no rusty water. I'm really scratching my head with this one!! Do I replace the EV and/or PRV when I suspect there may be nothing wrong with them just to...

That's interesting, although I don't think there is an auto-fill. I manually fill it up to 1 bar again using the filling key.

Thank you for the video link. Very helpful and I think it more or less confirms that I don't think it's the PRV or the EV. The last plumber re-pressurised the system but it dropped back to 0 over 2 days. It's difficult to know the exact amount of water but I would say perhaps 100ml a day.

Every day (for about 2 years) when the heating is on, I have to let water into my Worcester combi greenstar 28i boiler system. It drops to 0 again by the next morning. The pressure relief valve looks dry (i can't reach it to feel if it is wet) but there are no drips or water stains down the...