Overtightening is the most common. Plumbing fittings seal through a washer, a thread seal or an olive, not through force. Overtightening cracks fittings, distorts seals and strips threads, and the resulting leak is usually worse than the original problem.
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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.
