When a water heater fires up and shuts down prematurely after only 10 minutes, it is typically caused by a tripped thermal rollout switch, a failing thermocouple, or restricted flue venting. On gas units, if combustion gases spill back into the room due to a blocked vent, the thermal rollout switch instantly cuts off the gas supply for safety. On electric units, a failing thermostat or overloaded circuit breaker can interrupt power cycles. Verification: Check burner flame stability and inspect exhaust flues for obstructions or soot buildup.
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