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Mend Saunier Duval Boiler Fault Code

Saunier Duval Boiler Red light flashing F18 fault?

What does F18 fault mean?

Richard
October 2018
Saunier DuvalHeating, Home Heating SystemsSaunier Duval Boiler Fault Code

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Saunier Duval F18 Fault - Boiler Help