backboiler with front fire and coal effect, item 211560/B, Glow worm?

my backboiler and heating are working ok! but the ignition for my coal effect burner for living room only will not stay on. I had an engineer out last mounth to change my main meter downstairs. I am not sure if he did not turn on the main valve on/off fully. Could it be an ignition failure(switch) or something else.