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Mend Worcester Bosch Greenstar He Problem Years

f7 problem?

f7 has started to appear as a fault on my worcester greenstar he boiler . it is 10 years old now but regularly serviced . what is the cause and solution please

philip
April 2012
Worcester BoschWorcester Bosch Greenstar HeHeating, Home Heating SystemsProblem Worcester Years

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Worcester Bosch F7 Error - Causes & Fixes