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I have a Glow Worm sealed system that is showing 0 on the pressure gauge at the top of the unit. Been advised to open the filling mechanism inside the unit then fire up the system. All rads have been bled but still the gauge sits at 0. Can anyone advise?

Hi Was woken up the other day by a large banging sound and found out it was coming from the boiler in the kitchen. The unit ignites but then a loud banging sound happens after about 20 secs and the unit goes back to the blue pilot light. The boiler was working OK in the winter then in...