![]() You can easily replace it by screwing a new one on.ĭoes the arm move freely? Is the float watertight? If yes, but the valve still doesn’t shut off properly, the washer and/or nozzle may be worn. If the arm moves freely but won’t rise by itself, the float probably has a hole in it. If the water is running continuously, is the valve arm down? Move it up and down – this may release it if it has got stuck. The cistern then overflows when the faulty ball valve has dripped into the cistern all night. Normal water use in the home during the day can disguise a dripping overflow until the early morning. Remember, it can take hours for a small leak to raise the water level in a cistern enough for it to overflow. Is it extremely close to the overflow, or higher than the level where there’s limescale residue? This may give you the answer. If it’s not immediately obvious, take a look at the water level. ![]() If you don’t know which overflow pipe belongs to which cistern, simply looking inside each cistern should tell you. If the leaking overflow pipe is at loft level or sticks out from the eaves of the roof, then the source is either the cold water storage cistern, or the smaller feed and expansion cistern that supplies the boiler, if you have one. Ideally, it should be connected directly to the soil pipe.) This pipe should terminate in a gully below the leaf guard. (However, it’s wrong if the water simply drips out onto the ground. It’s normal for water to come out of this pipe as part of the boiler’s normal operation. The other is the condensate pipe, which drains away waste water from the condensing process. There may be two pipes sticking outside from your boiler. In both cases, the pipe takes water away from the pressure release valve. If the pipe is metal, it probably belongs to your boiler or an unvented hot water cylinder. If the overflow pipe is plastic and at ground-floor or first-floor level, then a toilet cistern is probably the culprit. The first thing to do is identify what is actually overflowing. Overflow pipe leaking – finding the source
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