To reset an unresponsive water heater thermostat, you must first turn off the dedicated electrical circuit breaker to ensure safety. Remove the upper access panel and insulation blanket on electric units to expose the thermostat dial and high-limit thermal switch. Firmly press the red reset button until you feel a distinct click. If the thermostat remains unresponsive or fails to regulate temperature after resetting, the electrical switch contacts have failed and the entire thermostat assembly must be replaced. Verification: Restore power and test water heating cycles to confirm normal temperature control.
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