In youre hand book it it will give you a minimum opperating pressure usually 1-1.5bar bellow this pressure the gas valve won't opperate. and will not ignite the system.... Top up the system using the filling loop! if your system was opperating ok at some point the question is why are you loosing pressure? obvious cause is a leak.
brian&ellen
December 2009
do you have a filler link pipe you need to top up your central heating to at lest 1 bar to 1.2 bar you can only do a few times as it will weaken the inhibiter in the system
frank
December 2009
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