Either the Main Burner Solenoid coil has failed, or the PCB is faulty.
either way you will need a Gas Safe Register listed engineer holding CCN1 & CEN1 ACS Certification to carry out the repair.
Working on Gas Appliances is unwise, could be illegal and should anything go wrong your Household insurance may be invalid
Boiler Repairman - Ipswich
April 2009