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Ok Thanks very much for your help SFJ

Hi again.. have uploaded a pic to my profile... I think you can access this?

A chilly night tonight! Yes the system is sealed and the red pressure tank is present. It is this that had the pressure dial that fell and has now been restored. The Johnson Controls refer only to two guages (blue boxes about 3 X 3 inches) that each have 2 ranges on them ... 1 "pressure"...

Thanks gents for your help.. but not solved yet! Have found the stat and all looks well. The boiler was not running when the pressure dropped but would have tried to come on on timed. Am I right in decribing these Johnson controls as pressure switches? From your comments should they be...

Thanks. Not sure which is the auto vent cap? The whole system has been trouble free until I took off the rads. I thought the boilers had low pressure cut outs within.. why would I have separate low and high sensors in line? Any idea how I could reset them if they were the cause? Draining the...

Boiler.. Glow worm 38 hxi Domestic system using OSO unvented pressurised system High and low pressure sensors set apart from main boiler. I have dropped the pressure in the system whilst bleeding radiators. Despite increasing the pressure to 2 bars the boiler will not relight. I think the...