When a water heater is not producing hot water, first confirm it has power or gas and that the thermostat is set correctly, then arrange a professional diagnosis if it still runs cold. The most common causes are a tripped breaker, an extinguished pilot or failed igniter, or a failed heating element or thermostat.
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- Make sure the electrical breaker is ON or the gas valve is open.
- For gas units, relight the pilot or test the igniter per the manufacturer’s steps.
- Press the reset button on an electric water heater’s upper thermostat if it tripped.
- If the tank is leaking, replacement is typically the right call rather than repair.
If you notice active leaking or smell gas, shut off utilities and contact emergency service immediately.
Updated: 2026-04-02
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