We have established there's a leak somewhere in the piping, our Vaillant loses pressure over a 48hour period. We've had leak sealer in and it solved the problem for 5 days. We've changed a radiator with a rusty valve connection. No joy
Problem is, there are no obvious damp patches showing on teh walls or ceilings. How do you start looking for that?
Problem is, there are no obvious damp patches showing on teh walls or ceilings. How do you start looking for that?