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Spoke to Worcester Bosch technical support - the chap there told me that the Si II combi doesn't have separate primary and secondary heat exchangers - there is just one heat exchanger. He suspects that scale/sludge is blocking things partially in the CH pipework part of the exchanger, and...

No, there has been no flashing lockout light, and so I haven't needed to perform a reset. Dave

I have their breakdown cover which has been useful on other occasions (I had the PCB replaced a few years ago, a new pressure gauge, couple of leaky radiator joints fixed etc.). But the included service does seem to be, as you say, more of a safety check than anything else. I have a £50...

Thanks for your reply. Yes - it is serviced annually by British Gas. They plug something in to take readings (gas emissions I think) and visually inspect it. I don't think they've ever taken anything out from inside. The kettling lasts for just over 5 minutes when the CH first comes on...

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 edited my post above to be more specific regarding the timings and nature of the noises. Any suggestions most welcome - it's always good to have some idea of the fault before calling someone out. Dave

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...

Many thanks for all replies; I hadn't realised it was just a standard foot-pump with a normal connection. I had assumed a special sort was needed in order to connect to a shock arrestor - evidently not! Is it common for these shock arrestors (spherical type, tennis ball size) to need pressure...

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...

Thanks for replying - much appreciated. I am having the gauge replaced shortly, and a magnetic filter installed to help keep the system clean. Dave

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...

Thanks, but I've tried that before on my kitchen tap, leaving a little bag of white vinegar tied round the limescaled end of the tap for a few hours. It started to strip off the chrome plating :shock:. Perhaps the vinegar I tried was particularly strong. Anyway, I'll try an official descaler...

Thank you both for your helpful replies. I do have a diagram of how it comes apart, but thanks for the link all the same. Regarding descaler, the only thing I have in the house that can remove limescale is "OxKleen Bath Power" - any good for this sort of job? If not, which brand do you...

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...

Thanks for the reassurance - I will leave well alone and forget about it... Dave

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...

Yup, already mentioned that option in my second post. I have found another solution: rotating the tap so that what was vertical before is now parallel to the pipe. The water doesn't have to rise in the tap anymore - it just descends at the same gradient in the tap as it does in the pipe...

Many thanks for your reply - much appreciated. I can't drain the outside pipe from inside the house, as it runs along the outside wall at a slight decline to the horizontal. I have since managed to disassemble the old tap, and can confirm it did not have a double-check valve. However...

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...

Thanks for all your advice so far. After 3 more small creaks, the weeping has virtually stopped. After one hour or so, although I can't see any droplet with the naked eye, the smallest amount of moisture can be detected with a piece of tissue paper where the nut meets the pipe. I don't think...