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Mend Glow-worm Heating Error Code Fault

what does f 12 mean on glow worm boiler?

what is wrong with boiler when it says f 12

kev
January 2012
Glow-wormHeating, Home Heating SystemsHeating Error Code Fault
F12 is a user interface connection error, Most likely a loose connection on the pcb or a pcb fault.

bill
January 2012

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