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Problem with heating on ferroli optimax 31c

\015 When you switch on heating it fires up but after a few secs d2 code appears\015

Answers :

D2 is the code symbol for delay after central heating. and is not a fault code.. however if this is coming on then stopping the operation of the boiler then it usually points to a sticking diverter valve.
Take the front cover off by lifting and unhooking. look in the manual to locate the diverter valve. Tap the diverter valve softly with scredriver or something you can get to it with, it should free it it from sticking. This has worked for me twice. Try the boiler before replacing the cover. Make sure you turn the boiler off at the mains before touching anything whilst the cover is removed.

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