Overflow Pipe Leaking?

Question

The overflow pipe connected to the cold water tank in the loft is leaking. It is definitely not an issue with the ballcock as it is not leaking and the water in the tank is not high enough to flow into the overflow pipe. Also the overflow pipe from the toilet is separate, so it is not this.. Does anyone have any ideas on what it might be? Thanks

Answer 1

Reduce the water level in the tank, your hot water can expand back into the tank when reaching temperature.



The tank water level needs to be around 50mm below the overflow outlet, double check your ball valve, it only takes a small drip overnight to cause an overflow, especially if the tank water level is too

high.



GL

Answer 2

This does not sound very clear, but I assume you talking about the toilet tank overflow. First try replacing the flapper or flush seal at the bottom, it may be leaking slowly into the toilet bowl. If this is not the problem the fallow these steps... If the toilet have the old style set up with the float ball, there's a possibility that the rubber seal valve from this assembly is cracked or bad preventing a good seal when it closed. If you have the newest system of automatic valve and shut off unit then you must look for the flow adjustment wheel right on the valve some were and give it few turns clock wise and try to see if this does it for you. If you have no lock the first time, just play with this wheel until the water tank fills at least 1/2 inch before the upper limit of the over flow pipe. On either situation, if you can stop the problem, you must install a new part...! Good luck...!

Answer 3

since water level has to rise enough to get into overflow pipe ( hence overflow!) it suggests ballcock is not working effectively every time. I would chang the seal in it at least if not entire valve. check and seal any joints on over Flow as any water should be carrie outside building and not leaking within.

Answer 4

If its a standing waste then the water might be leaking from the internal connection at the base of the stand pipe.

Check that the overflow from the heating tank is not connected into the o/f pipe,if it is,then it could be from the boiler feed and expansion tank.

Answer 5

You may have 2 water tanks in your attic depending on what type of system you have. There is a large tank for hot water, and a smaller tank for the central heating. Have a look around and see if you can locate another tank. This could be the one that is overflowing, and the overflow on that tank is connected into the overflow for the large tank.

Answer 6

The overflow pipe is what it says - designed to take the overflow of excess water from the water tank.

If the level is below this how can it be leaking? I would shut off all stop valves and see what happens.

Then turn on one at a time to try and isolate the problem.

Answer 7

I would check for a crack in the overflow pipe itself or the seal at the base of the pipe. It sounds like you've check everything else.

Answer 8

Check where the pipe leads.