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Thanks again - I assume that the inhibitor is the gunk that stops the system rusting up or some such?

Many thanks for this advice - I will follow it! Will all the rads need bleeding btw? :D

I inherited in my house a 10-year old Worcester 28CDi combi boiler - it's a sealed system - which had been standing idle for about 6 months. When it's operating all the right lights and sounds appear. However, the pressure in the CH system when running, as per the gauge, raises very slowly and...