how can i fix my potterton performa 24?

hi ya everyone i have a potterton performa 24 central heating system some times it fires up for hotwater,heating a green light for power on then an orange light for burner works for 30 seconds then cuts out ,no pilot light or blue flames on gas feed inside of boiler a very faint green light is on no orange light either on auto ,or manuely turned and no igniter sound or fan not workin plz can you help