If it works using that process, I'd suspect the igniter is good and working properly. That essentially leaves the control board, but I'd be reluctant to replace it as long as the "work-around keeps you in hot water"...
You might want to check the electrical connections on the water heater control board. There may be a loose or partially disconnected connection ????
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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