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    VIDEO: Can anyone identify this boiler behaviour?

    I recently removed a radiator and capped off the pipework. When I refilled the system, the combiboiler (Promax) seems to have air in it and makes a "clunking" noise when supplying hot water. VIDEO HERE: Both hot water and central heating work fine, although the hot feed no longer consistently...
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    What are these called?

    I need to fix some new kitchen cabinet hinges, but need to find some new versions of these "caps" that fit into pre-drilled holes. Without them, the screws don't have enough depth for traction. Anybody know what they are called? I can't find them online anywhere! Thanks
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    How is this done?

    I have an under-cabinet light, that appears to be connected to the mains. I'm curious - what is actually happening here? Is this likely a [transformer box?] wired in [parallel?] to the socket below? Is it a common setup for under-cabinet lights? If I want to do this on more cabinets, is...
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    Why is my lighting circuit at 20V?

    I have just started to learn to use a 2-prong voltmeter. I've been testing the lighting pendants I have around the house, and one is at 20V, whereas the others are at 240V. Is this usual / is there a reason this is happening?
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    What is this alarm wiring?

    I've just moved into a new flat and inherited parts of an old wired alarm system. This controller is on the wall, but when I test the wires the power appears to be dead. What would these wires usually supply? Not 240v? Typically, where should I expect them to connect to? Can I use this wiring...
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    Can pipes under a combi boiler be moved?

    I have just bought a flat, which has the pictured combi boiler installed in an airing cupboard. As shown in the photo, the installation has a large number of crossing pipes, some of which appear to go down under the floor and some of which go right to the kitchen (and towards the gas meter)...
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