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Reset the Thermal Switch

This is a continuation of previous steps. If you started here, please refer to previous steps to ensure you've followed all safety precautions.

The information on this web site is supplemental to the printed instructions that came with your water heater. To reduce the risk of property damage, serious injury or death, read and follow all labels on the water heater and the safety instructions in the printed owner's manual.

Step 1: Reset the Thermal Switch

<strong>The thermal switch can trip if the water heater is not getting enough air.</strong>
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  • The thermal switch can trip if the water heater is not getting enough air.

  • Press the small reset button in the center of the thermal switch. If it's tripped, you may be able to hear it click.

  • Even if you do not hear the thermal switch click, try lighting the pilot using the instructions on the water heater's label.

  • If the Status Light now begins to flash, the thermal switch probably tripped. This means the water heater is not getting enough air.

  • Replace the outer door.

  • If this is a new installation, see Performing a Draft Test.

  • If the water heater is several years old, the air filter or flame arrestor may be clogged with dust or lint. See Cleaning the Air Filter and Flame Arrestor.

  • If the Status Light still does not flash, turn the gas control knob OFF, turn the gas supply valve OFF, and click on "More Help" below.

Existing Installation - Status Light Flashes