Why is my cold water tank overflowing?

The most common reason for a cold water tank to overflow is a faulty ball valve. As the water level in the cistern rises, the float pushes a washer onto the valve seating – a plastic nozzle inside the valve body. This stops the flow of water into the cistern.

Does a cold water tank have an overflow?

The overflow (also called the expansion/vent pipe) from a copper cylinder runs into the cold water feed and expansion tank in your loft. This pipe allows for the water in the cylinder to expand when it’s heated. It’s normal for the overflow pipe on a copper cylinder to drip when your water is heating.

How does a toilet ballcock stop the flow of water?

When the ball rises high enough, the valve stem is levered down against the water inlet, stopping the flow of water. This type can often be repaired simply by installing a new rubber washer on the tip of the valve stem, provided you can get the parts disassembled to service them.

What to do if ballcock valve is not working?

Ballcock valve not operating properly. Waster supply is restricted. Check shutoff to make sure it’s completely open. Check for scale or corrosion at entry into tank on valve. Condensation. Install foam liner, tank cover, drip catcher or temperature valve. Leak at flange wax seal.

What’s the difference between a ballcock and diaphragm fill valve?

Although the term ballcock is sometimes used to refer to any type of fill valve, technically the term applies only to two types—the plunger-type and the diaphragm-type—both of which have the identifying float ball that operates the valve via a long arm attached to the ball.

Is there a ballcock valve in my water tank?

I recently had a plumber out to replace the ballcock valve in my cold water tank in the loft as it was overflowing to the pipe outside the house. The new valve has certainly fixed that problem, with the water level set about an inch below the overflow pipe.

What to do when your cold water tank fills up?

The new one is scale free and filling up as it should. I’ve had this with many people in the past because it sounds “different to before”. If it’s that bad, try sticking another ball valve in as you can sometimes get faulty or cheap parts.

What kind of valve is in my cold water tank?

The valve is a type 2 high pressure. Any advice or suggestions for a different replacement would be greatly appreciated. I recently replaced the ball valve on my cold water tank in the loft but ever since then my wife has complained about the loud ‘whooshing’ noise as the cistern fills.

What to do if your cold water tank makes noise?

If it’s that bad, try sticking another ball valve in as you can sometimes get faulty or cheap parts. You could go to a plumbers merchant or even Screwfix and get a more expensive valve. I use these and never had a problem. I replaced my own part 2 valve with a new, but different brand part 2 valve and it makes a terrible water noise.