I have a GE (Rheem) SmartWater SmartShield Sensor System Water Heater (mfg date 12/2007) where the burner cuts out before full heating is reached. When this happens there is a click in the valve and all burning natural gas is eliminated (pilot and burner). The pilot light will reignite immediately and the tank will resume heating. This process repeats 3 to 4 times until the water is to temperature and the burner only shuts down. I called the service number and was immediately sent a new gas valve. After replacement of this valve it continues the same behavior.
The glass vile is still in one piece behind the burned.
The click you hear is the gas valve shutting off flow. It does that because the thermocouple (a rod sticking into the flame of the pilot) voltage drops, usually below 13 millivolts or so. Might be a loose connection from thermo to valve body (should be finger tight plus 1/4 turn) or a bad thermo ($13 at Lowe's). Good Luck.
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