E24
Bradford White Upper Thermostat / Sensor Fault

Bradford White electric or hybrid water heater displays E24 and stops heating.

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Safety Warning

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.

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Possible Causes

Open or shorted upper temperature sensor, Loose wiring at upper thermostat, Tripped ECO on upper thermostat, Defective upper thermostat assembly

How to Fix / Troubleshooting

Safety: Turn off power at the breaker and verify with a non-contact voltage tester. Water in the tank may be hot.

Steps:

  • Access upper thermostat: Remove the upper access panel and insulation to expose the thermostat and ECO.
  • Reset ECO: Press the red reset button on the upper thermostat. If it clicks, it was tripped. If it trips again soon, investigate overheating causes.
  • Check wiring: Tighten all screw terminals. Look for burned or discolored wires and replace as needed.
  • Test thermostat/sensor: With power off, measure continuity across the thermostat contacts and resistance of any attached sensor. Replace the upper thermostat assembly if readings are out of spec.

If you are not comfortable working inside an electrical panel, contact a licensed electrician or water heater technician.

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Repair Difficulty

Medium 3/5

Required Part

Upper Thermostat / ECO Assembly
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