How can I re-ignite my Worcester Bosch 24i?

Please help ! I have a new WB 24 i bolier. Hot water works fine, no flashing fault lights, but the CH wont ignite (no green light). Wireless remote is full of life and sending a signal. Any ideas appreciated. Pressing reset button momentarily lights up the fault button and reset button and green light, but after it tries to ignite, all go off. Thanks. Roger