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Sime Friendly E last couple of days been losing pressure on CH. Top it up to 1.5 bar, turn on the CH and watch it drop .5 bar in 10 mins. Cannot find leak anywhere. Interestingly doesnt seem to drop on DHW. But, can hear slight hissing sound around the tap to charge up the water pressure...

Wall Hung boiler - seems to work fine but vibrates like crazy and is noisy. Even outside by the flue it is really load like a rattling noise. Pressure gauge shows 1.5bar and only needs topping up every 6 months by a little. Any thoughts gratefully received.