I'm not certain if it is the same way on your HW unit, but there is a thermal cutoff on my unit that protects the circuitry if there is a flameout due to spiderwebs or some other obstruction in the burner tube, causing the flame to reverse directions and come out of the wrong end. If the thermal cutoff "blows" it won't work on gas or electric.
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TT: 2019 Minnie Winnie 2500FL, e2 WDH; former 2015 Keystone Bullet Premier 19FBPR
TV: 2012 Ford F-250 Lariat Super Duty Crew Cab (gas 6.2 L, 3.73 gear ratio 2WD, 172" WB)
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