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Mend Ferroli optimax he plus 38 c Pressure F37

ferroli optimax he plus 38 c how do I raise pressure to 1 - 1.5?

have tried to increase pressure to 1 - 1,5 due to fault F37 turned both black knobs but no difference there are also 2 blue taps, i have tried them in both positions any ideas?

philip smith
November 2010
FerroliFerroli optimax he plus 38 cHeating, Home Heating SystemsFerroli Pressure F37

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