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What could be the cause of kettling in *both* the central heating and the hot water? It started all of a sudden (not a gradual increase), a few days after a radiator was replaced and the boiler serviced. It seems hard to believe that both the CH and hot water pipework in the boiler have...

I have a 9 year old Worcester Bosch 28SiII Combi boiler which has worked quietly and well so far. At the end of August, I had a radiator replaced and the boiler serviced a couple of days later. The heating hasn't really been used until October. Two symptoms have seemed to start at pretty much...

I will probably need to top up the pressure in a shock arrestor (expansion vessel) soon, which is placed in the mains pipe between my water meter and combi boiler. The shock arrestor is one of the spherical ones, about the size of a tennis ball. After about 6 years, I started getting severe...

I have a Worcester Bosch 28 SiII combi boiler from about 2005. Topping up the pressure via the filling loop when necessary (e.g. after bleeding radiators) is very awkward since the gauge takes anywhere from 30 minutes to 1 hour to react fully to a change in pressure. All the guides I have...

I have a Mira Fino shower (the "exposed controls" version), and need to change the flow valve as it is getting harder to turn off the shower completely. I have acquired the relevant spare parts - new flow valve and new on/off lever, including all relevant washers. The instructions warn me...

I needed to temporarily turn off the isolation valve to my toilet a while ago in September. As I turned the screw, there was a dreaded hiss, and a little water spurted out from around the screw. It didn't last long, and seemed to stop by itself. Anyway, it's been fine for nearly 3 months (I...

I have just replaced an old outside bib tap with a new one. The new one has a double check valve built in; I'm not sure about the old one as I haven't managed to unscrew it from the old wall-plate to look inside. Two queries: 1) With the old tap, I was able to drain it by shutting off a...

I hope to finish fitting an outside bib tap soon, and would like a little advice as plumbing is not something I have any experience with at all... All the pipework inside and out was already done as I am essentially replacing an old tap which was never much good (an ancient thing that didn't...

I have two isolation valves (compression joint type) in my bathroom, for the hot and cold feeds to the wash basin. A light turquoise substance is gradually forming on both valves, around where the nut meets the screw. Is this some kind of harmless mould that can be safely scraped off every so...

The stopcock in my house for the mains water is very stiff, and a wrench is needed to turn this tap on/off. Is it safe to squirt a little WD40 around the stopcock tap, or could this actually risk causing a leak in the stopcock? Dave