[A/S] Hot water heater malfunction, your ideas please.

Flick the HWH on. Ignition, followed by ignition light shutting off.
Water gets hot. Gas shuts off. All well at this point. But the
ignition cycles several times. heater does not light. Ignition light
stays on until I shut it off. Because the ignition light is on, as the
water is used (cooling) the gas does not flow. Manually recycling the
switch does bring sustained ignition and relighting.

My theory: The heat sensor shuts the gas off, and the ignition switch
remains on, cycles thru its Lets light the gas thing,then quits.

What controls all of this? Where should I look for the culprit.

S

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