Glowworm space saver Boiler does not work?

We have a glowworm space saver central heating device at home. When we switch on the device, we can see the flame burning that provides the heating. However, there was a earthing fault on one of the iron boxes that we use, that caused a trip on the main switch board. The central heating was switched on at the time. When we reset the trip switch and switched on the heating device, the device powered on but the flame no longer appears and the central heating does not seem to work. Any suggestions?