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Hello, it could very well be an igniter issue, precipitated by an electrical spike that occurred as a result of the SCE shut down. The banging would be caused by delayed or intermittent ignition.
Odds are in the 95% range that replacing the printed circuit card containing the ignition module will solve the problem... it is nothing that you fix by any sort of reset.
If you are exceedingly handy with appliance repair I can coach you on how to further test and replace the ignition module. if not, tell me which direction you are from the center of the nearest city and I will look for a well rated local repair outfit for you. I will also need the brand and model number of the heater or furnace and a physical description of it.
We can go from there.