Tested it fine know it shuts off the feed that way.
Overflow pipe from tank in attic.
An overflow pipe leads from a water storage tank or cistern inside your home to the outside.
Looking for some advice.
If the water in the tank or cistern fills up to a higher level than it should the excess water flows down the overflow pipe and runs outside rather than leaking into the room.
Have already changed the valve and float in the attic.
If not then u will still have a expansion tank in the attic with an overflow.
If its the toilet it will be directly connected to the white overflow pipe so should be easy to trace.
I have an open vented system with a hot water pump stuart turner monsoon twin 3 fitted.
With this type of valve the brass stem is bent downwards carefully to adjust the water level.
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How to diagnose and repair a dripping overflow.
It could be that tank or it could be a toilet overflowing.
The tank will either be your cold water header tank or the flow and expansion tank for the heating system and the valve is a type 1.
If this leak is very recent then the ball valve needs a new washer as the tank is overfilling.
Unless your pressurised hw system is in the attic too then it could be a blowoff safety valve no idea about heating system the heating is run from a stanley oil fired cooker don t think it s pressurised though.
I think you might be right about the tank on the landing.
The tank in the attic has been trickling out of the overflow for a few weeks now.