State electric water heater with electronic control displays F01; no hot water or limited hot water.

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 upper electronic thermostat, Loose wiring to upper element, Tripped ECO on upper control

Safety: Turn off power at the breaker and verify with a non-contact voltage tester before opening any covers.

Access upper control: Remove the upper access panel and insulation to expose the thermostat/control.
Check ECO: Press the red reset button (ECO). If it clicks, it was tripped. Restore power and test. If it trips again, investigate overheating causes.
Inspect wiring: Tighten any loose screws on the thermostat and element terminals.
Replace control: If F01 persists, replace the upper thermostat/control with the correct State part.

Medium 3/5

Upper Thermostat / Control Board

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