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Got f5 code on glowworm 18Si boiler?

Boiler keeps cutting out and displays a f5 code, what can I do
Steve, November 2013
This is an overheat error code.could be a blockage or circulation issue.may need to press the reset stat button on pipework inside boiler.

A1, November 2013
link Click here to see other fixes for Glowworm 18Si.