Hi i have a glow worm 30cxi , which works fine and runs with no problems atall untill it gets to freezing outside and the frost protection kicks in, its then that i loose pressure and it goes down to 6 bar and the cental heating doesnt start. when its fine outside the boiler runs for months without the need for a top up, but as soon as theres a bit of frost i loose the pressure over night, any thoughts on the matter would be great, thanks paul..
loosing pressure when frost protection starts
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