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Mend Ferroli Optimax HE 31C Boiler He 31c

Ferroli Boiler Optimax HE 31C?

Flashing F21 what does this mean and can I fix it without having to call an engineer?

Gerry
December 2016

Ferroli Ferroli Optimax HE 31C D.I.Y, Plumbing Ferroli Boiler Optimax He 31c

You should be able to fix it yourself, but it means actually doing something yourself, whihc yi clearly have not been able to do so far.

30 seconds with a Google search gives me (and could have given you) these gems:

http://howtomendit.com/answers.php?id=292233

http://howtomendit.com/answers.php?id=400909

http://www.justanswer.com/uk-plumbing/4fr54-ferroli-he31c-boiler-fault-f21-showing.html

XXX
January 2017

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Ferroli Optimax HE 31C F21 Error - Fix?