Emergency Guide

No Hot Water Troubleshooting

Lost hot water? Troubleshoot common causes yourself before calling a plumber. Quick fixes for gas and electric water heaters.

4 min readUpdated August 26, 2025

Check the Basics First

No hot water? Check these first: For electric heaters, look for a tripped breaker and reset it. For gas heaters, verify the pilot light is lit and gas valve is on. Confirm the thermostat is set to 120°F. These simple checks solve most no-hot-water situations without needing a plumber.

For electric heaters: check your breaker panel for a tripped breaker and reset if needed. For gas heaters: verify the pilot light is lit and the gas valve is in the 'on' position. Check that the thermostat is set to 120°F or your preferred temperature. These simple checks solve many no-hot-water situations.

Electric Water Heater Issues

Electric water heater troubleshooting: if the breaker keeps tripping, call an electrician. Check the reset button (red button on thermostat) and press to reset. A failed heating element is common—there are two, and one failing reduces capacity significantly. If basic checks fail, call a plumber for diagnosis.

If the breaker keeps tripping, there may be an electrical issue—call a professional. A failed heating element is a common cause in electric heaters—there are typically two, and one failing reduces capacity significantly. Reset buttons (red button on the thermostat) sometimes trip—press to reset. If these steps don't work, professional diagnosis is needed.

Gas Water Heater Issues

Gas water heater troubleshooting: if the pilot won't stay lit, the thermocouple likely needs replacement—a common, inexpensive repair. Verify the gas valve is fully open and the burner shows blue flames when heating. If you smell gas, leave immediately and call your gas utility from outside. Never attempt repairs if you smell gas.

If the pilot won't light or stay lit, the thermocouple may need replacement—a common, inexpensive repair. Ensure the gas valve is fully open. Check that the burner ignites when the thermostat calls for heat—you should see blue flames. If you smell gas, leave immediately and call your gas utility from outside. Do not attempt repairs if you smell gas.

When Professional Help Is Needed

Call a plumber for: persistent pilot light problems, electrical issues beyond tripped breakers, unusual noises or leaks, rusty hot water, insufficient hot water despite proper settings, or units over 10 years old with symptoms. Water heater repairs involve gas or high-voltage electricity—leave complex repairs to professionals for safety.

Call a plumber for: persistent pilot light problems, electrical issues beyond tripped breakers, unusual noises or leaks from the unit, rusty or discolored hot water, insufficient hot water despite proper settings, or if your water heater is over 10 years old and showing symptoms. Water heater repairs often involve gas or electricity—leave complex repairs to professionals.

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