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Thanks for the quick replies. The pressure was around 1.7 yesterday and overnight dropped to 0.6 (the current boiler is a Glow worm XtraFast). I did notice this morning that the overflow pipe outside had been leaking a lot. Any further help is much appreciated :)

Hi, I've got a combi boiler and its serviced every year. Everything was fine, but the past couple of days I've noticed the pressure dropping on the system when the heating is off. I've increased the pressure by using the tap the engineer showed me (new home owner and no idea before this), but...