Boiler Protherm 80e broke?

I have a Protherm 80e boiler. Yesterday all the electrics went off in the house and there was a load bang. When I got the electrics switched back on, there was a problem with the boiler. It seemed that the bang had come from the boiler. The boiler now constanly displays F1 and when I try to re-ignite the bioler it seems to try to come on and then after a few seconds goes back to F1.

Please, I need help. Could someone tell me what this may be.

Thanks