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Mend Sabre 25 HE Plus Boiler Thermostats Set

Sabre 25 he plus boiler keeps over pressurising?

Boiler keeps over pressurising ,have to shut some radiators down t stop it relieving thermostats seems to be working have to set it low but still gets very hot will switch hearing on and off though ,could the expansion vessel ,no air or water comes out of bleed vent ,looking at parts list t looks like there is a filter in t

Mr P Ashmore
March 2016
SabreSabre 25 HE PlusHeating, Home Heating SystemsBoiler Thermostats Set

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Sabre 25 HE Plus Boiler Over Pressure - Fix?