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Our shower started to take a long time to get hot and so I replaced the cartridge. (6yrs old) Having done this there's now a leak from the rear of the mixer. On removing the cartridge again I found that the O-ring was damaged. I swapped it for another O-ring but the same thing happened. Has...

I was wondering if someone could explain the "performance" settings of this pump please. It was installed 4yrs ago but I've not been convinced it was set up properly. It has a green light and two yellow ones, which I think means "low medium performance." This is for an underfloor heating...