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Alpha InTec 24X ?

My boiler isn't producing hot water or heat and is saying error code 20 - which is saying a flame sensing fault, Any ideas on how to fix it or if I need someone to come look at it
Lynsey, February 2017
Thanks will do ☺

Lynsey, February 2017
http://www.boilererror.co.uk/errors.php?merk=2&ketel=2&storing=35&subcode=0

Probably best to have a Gas Safe (in the UK) certified engineer to have a look

XXX, February 2017