Flashing blue light Greenstar 30Si?

Hi, We recently had a radiator moved and since this, the blue light on our Worcester Greenstar 30Si is flashing fast. We have tried all the suggestions like turning everything off and re-starting, pressing the re-set button, there are no other lights on and neither is the pilot light. The boiler is programmed through a wireless system, and I have re-set and checked that all that is in order. Many thanks for any suggestions, this seems like a fantastic site judging by the comments left, great to keep as a favourite for the future. Thank you.