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Can I fix a D3 flashing error code on my Worcester 35cdi?

I have a flashing error code D3. Power is on and the pressure is on the green bar code. I have pressed the reset button and held it for 5 seconds. Do I need an engineer or can I fix it please?
anji, June 2012
cant find any reference for D3 fault code on that particular make & model of boiler
checked user & installation & service manual
D3 not listed at all
suggest you call worcester tech helpline
01905 754624
their advice is free

AWOL, July 2012
link Click here to see other fixes for Worcester 35cdi.