Worcester junior 24i boiler

[singapore54]

My boiler's fault light is flashing 4 times per second. No heating or hot water. I've changed the fan but the problem still persists.
Any heating engineers out that have come across this fault?

Any help would be appriciated.

[Panic Button]

Download the user manual here, and see if it has a problem solving section to explain the light

http://www.worcester-bosch.co.uk/homeowner/literature/discontinued-boiler-literature/discontinued-gas-boiler-literature/24i-junior-rsf-discontinued-aug-2007-literature