A mixer that drips, becomes stiff, or will no longer hold a temperature setting is almost always a worn cartridge. Cartridges are specific to the brand and model rather than universal, which is why knowing the make helps.
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For a burst pipe or a serious leak, turn the water off at the mains tap before you call. If water is anywhere near power points, the switchboard or light fittings, stay clear and treat it as an electrical hazard. Do not enter standing water in a room with live power.
