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Repressurising the system?

My Daughters heating and hot water switched off. The gage dropped to zero.

She does not know which of the levers to turn to repressurise the system.

Sge says that there are two blue taps and a red one, but they are hot!!

Can you help please.
Doug, December 2010
more info we cannot guess, more info less guessing

wirecutterman, December 2010