E33
Bradford White Tank Temperature Sensor Fault (Hybrid Models)

Bradford White heat pump water heater displays E33; heat pump mode is locked out.

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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 tank thermistor, Damaged sensor harness, Poor sensor contact with tank well, Control board sensor input failure

How to Fix / Troubleshooting

Safety: Turn off power and allow the tank to cool if recently heated.

Steps:

  • Locate tank sensor: On hybrid models, the tank sensor is often inserted into a dry well on the side of the tank and connected to the control board via a harness.
  • Check seating: Ensure the sensor is fully inserted into the well and secured.
  • Inspect harness: Look for damage or loose connectors. Reseat at both ends.
  • Test sensor: Measure resistance and compare to Bradford White specs. Replace if readings are abnormal.

Note: If multiple sensors show faults simultaneously, suspect a control board or power quality issue and contact a technician.

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Repair Difficulty

Medium 3/5

Required Part

Tank Temperature Sensor (Hybrid)
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