Dometic Gas/Elect Water Heater Sometimes Does Not Work

If you’re talking about 120vac electric, that’s totally separate from the gas. I occasionally wipe off the porcelain spark rod insulator with alcohol and clean the rod tip with a scotchbrite pad. I’ve had to replace the spark rod when it was carbon tracked. I added a ground from the spark rod base, to the module ground point and that cured some very infrequent lockouts. The ground path for flame rectification is as important as the spark rod and high tension lead wire. Craig