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Mend Ferroli Optomax 38 Pressure Boiler

raising the pressure on a Ferroli Optomax 38?

I have just moved into a house with a combi boiler. I had to remove radiators for redecoration. The boiler has lost pressure and showing F35. Can anyone tell me which valves to operate to repressurise the system. The manual doesn't help.

Norman
October 2013
FerroliFerroli Optomax 38Heating, Home Heating SystemsPressure Ferroli Boiler

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