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how to permanently fix the EA error code and loud grinding noise?

I have the same problem reported here by many, where by my Scottish Gas boiler is making a very loud grinding noise which then inevitably leads to the EA code flashing and boiler stops working.
It is not cold enough to be a frozen condensation pipe so I've not looked into trying the 'kettle trick'.
I have tried the emptying of the small cup inside the boiler and allowing it to drain out. Which does fix the situation after a reset. But this fix only lasts for about 24 hrs and then it breaks again. I've done this 4 times now in last 5 days. It is a workaround for now, but I obviously cant keep doing this daily.
Does anyone know of anything else I can try before I give in and call out the experts?

Any advice would be greatly appreciated.
Thanks in advance.
Ben B, November 2015
http://www.justanswer.com/uk-plumbing/60umf-ea-error-message-worcester-bosch-cd27i-boiler.html

May help a bit, November 2015