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

GARY PEDDER
January 2018