Just in case there is a kindly plumber looking at ChatterBank (I suspect there are more people in here!), I pose the same problem that I posed in D I Y section. The lockout lamp on my oil fired combi boiler came on yesterday and, as a consequence, the heating went off. Before you ask, yes, we have got oil in the tank. Any suggestions as to what it might be and how I can get it working again please. TIA