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Vaillant eco plus 531 boiler?

replaced pcb board f70 ,asks for password no,17, but no 17 on display ,goes from 16 to 22 .on boiler vaillant 831

fred smith
November 2021
VaillantHeating, Home Heating Systems
Heating, Home Heating Systems

Vaillant VCW-Sine18 T3WFH Lights but then goes off after 5 Min?
Heating, Home Heating Systems

Vaillant 828E - no hot water?
Heating, Home Heating Systems

Vaillant Ecotech Plus 831 F22 fault?
Heating, Home Heating Systems

No hot water, intermittent when air temp drops?
Heating, Home Heating Systems

Vaillant igniting issue ( domestic ) not CH?
Heating, Home Heating Systems

how do I rectify the fault as detailed below?

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