how can fix my baxi combi instant boiler 105e?

the little LED's are lit up to show that theres no flame, theres a fault on the fan or flue and the safety thermostat has been activated....
im not sure wheher the central heating works, but i know or sure theres no hot water!
apparently all i need to do is re-ignite it, but im not sure how....
ive managed to rip the front panel off, but i cant see anything inside (that i understand anyway)
thanks