potterton puma 80!it wont fire up but the pilot light and led lights are on?

my puma 80 has been very noisy for two weeks from the top part of the boiler the fan area!the pilot light has gone out a couple of times but in general its stays alight and now the pilot light has stayed on for the past few days but now it wont fire up when i put the hot water on or central heating all the led lights are on ,is it the fan ?any ideas please! no hot water or central heating!