![]() The two bodies of water should never mix. Hot water from the boiler flows through the coil in order to heat the water in the hot water cylinder. In this case, it’s most likely the smaller feed and expansion cistern that overflows. Broken coilĪnother reason for an overflowing cistern is a broken coil in the hot water cylinder. Of course, this problem can also occur if an existing mixer tap or mixer shower develops a leak. Think back – did the cistern only start to overflow after the recent installation of a device with a mixer valve? Or does it overflow when you have a bath or a shower? If so, then it’s very likely that a mixer tap or mixer shower is the cause of the problem. and there isn’t such a valve on the hot supply pipe. This is very likely to happen if a mixer tap or shower has a faulty or absent non-return valve. It will push back through the hot water cylinder and back into the cold water storage cistern. If the two bodies of water mix, the cold water will displace the hot. Mains pressure water is at a much higher pressure than gravity-fed water, like the water from your hot water cylinder. The cause of this fault relates to one of either two aspects of your plumbing system: a mixer tap or shower, or an indirect hot water cylinder. Overflow pipe leaking but the ball valve is OKĭoes the valve shut off normally and at the correct level? If so, then the cause is water entering the cistern through the outlet pipes at the bottom. 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 Powerflushing: what is it & why do I need it.Fix a blocked or frozen condensate pipe.Radiator cold at the bottom, hot at the top.
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