baxi bermuda 57/4e pilot on but wont fire up

[magical]

working yesterday this morning flicked switch to heating & water, ignition clicking, pilot lights up but wont fire up back boiler

 

[Phil Stenning]

does the 'clicking' continue when the pilot been established and stayed lit?

 

[magical]

yes it keeps clicking when pilot is lit

 

[Phil Stenning]

then there is a fault with the flame rectification, time to call in the pros, as it will involve removing the fire front.