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Hi all, I have a 1930's detached house. In one of the bedrooms in the corner of 2 external works there is black mould that has started to grow. It's only in the corner and has discoloured the paint to a pale white colour and black mould inbetween. Could this be due to an issue on the outside or...

Hello all, first time poster here. I have recently had a vaillant 937 fitted and a 350F vaillant controller. Outside of the timed heating and hot water, the boiler is constantly running. Is this because the its trying to get to the desired temperature on the thermostat? Thanks, diysim