Boiler is a Vaillant combi turbomax 824. Over last couple of weeks has been losing water pressure requiring a top up every few days. Have checked all radiators, taps and visible pipework, but no sign of any leaks. However most of the pipework is below floorboards so cant be checked.
Is it likely to be anything in the boiler? I'm thinking expansion vessel. Before I call in the heating engineer, anything I can check to identify whether it's the boiler or pipework?
Is it likely to be anything in the boiler? I'm thinking expansion vessel. Before I call in the heating engineer, anything I can check to identify whether it's the boiler or pipework?