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home Fix label Heating label_important Home Heating Systems category Ferroli

low water pressure ferroli optima 38. ?

I have F37 flashing in the window which indicates low water pressure. I realise that I need to top up the pressure to 1-1.5 bar but unsure which valve to tutn, the obvious one 2nd from right makes no difference, ay clues?
SJ, March 2010
home Fix label Heating label_important Home Heating Systems category Ferrolidone
the black ones on the right hand side, both need to be open.
They will either be a wheel or lever but will be the only black ones

acs, May 2010
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