Problem with heating on ferroli optimax 31c when you switch on heating it fires up but after a few secs d2 code appears

http://www.ferroli.co.uk/wp-content/uploads/downloads/2012/05/Optimax-25-C-Manual.pdf

Try bleeding the air out of the rads then represure system

Is there an error code? If not the flow sensor for the hot water could be faulty. Also if you've had a power cut depending which model of Optimax HE you have, you sometimes have to tell the boiler it's a Combi, as they have a generic Pcb fitted which is also used on the system only boilers.

it is either your pump is not running or blocked [ debris from installation ect ] or your diverter valve is stuck partially open allowing a little water to pass into the heating system [ usually first rads on system ] it runs for a short while and cuts out because your overheat stat is kicking in because of poor circulation [ it is only running around the primarys in the boiler where it quickly reaches the over heat limit ] temp tends to rise approx 1 deg per second a clear indication of circulation problems.
solution GET RID OF THE FERROLI

I sent an e-mail to [email protected] telling them that my Optimax HE 31 C
manual didn't include instructions for the timer, and received a manual via e-mail within minutes.

You probably won't get a reply during the weekend though.

Good luck!

Trevor

hi had same problem engineer came out and the diverter valve was cloged up sorted it and recomended a system flush plus install a magnet clean whitch picks up debri be 4 it gets 2 the boiler.

Here you go, page 30, sounds like it's overheating, possibly a problem with the boiler stat or lack of circulation in the system. http://www.ferroli.co.uk/Product_Documentation/Domestic/Optimax_HE_31_C_Manual.pdf

D2 is not a fault what that means is delay and 2 refers to CH which means the boiler has gone into standby mode. you need to check that your CH circut is open, there is a filter on the return valve into boiler make sure this is not blocked. If this is blocked the water is just going though the boiler by-pass so then the boiler thinks its up to temp. hope this helps

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.

Here is a link to the manual.It shows fault codes.
http://www.ferroli.co.uk/Product_Documentation/Domestic/Optimax_HE_31_C_Manual.pdf

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