There is an overflow pipe (I'm assuming - its a small pipe that goes through the wall from the combi boiler and into the yard) it used to just drip occasionally however it's now pouring with water. Whenever the heating is put on the water is gushing out of the pipe like a tap. Has anybody got any ideas what this is. Thanks.
It sounds as though your overflow valve on the boiler is partially open from rust or scale. Look at the pipe that goes through the wall only look at it at the boiler. There should be a small valve with a small lever that you can lift to allow it to blow full blast. Do this for 5 to 10 seconds and shutoff. the problem should be fixed or the valve is faulty. Hope this helps you and good luck. Richard.
Its the relief valve. Either your boiler pressure is over 30 pounds or your relief valve is leaking by. Check your boiler pressure is about 12 pounds its. Change the valve
