State electric water heater displays F02; water may be too hot or not hot enough.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Failed tank thermistor, Loose sensor connection to control, Control board sensor circuit fault

Safety: Turn off power at the breaker.

Locate sensor: On electronic models, find the thermistor inserted into a well on the tank.
Inspect and reseat: Ensure the sensor is fully inserted and the connector is secure.
Test sensor: Measure resistance and compare to the State chart. Replace if out of spec.
Control replacement: If a known-good sensor still yields F02, replace the electronic control.

Medium 3/5

Tank Thermistor

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