E3T
Richmond
Temperature Sensor / Probe Fault (Electronic Models)
Richmond electric water heater displays E3T; unit may not respond to temperature adjustments.
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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
Failed tank temperature sensor, Loose sensor harness, Sensor shorted by moisture, Faulty electronic control board
How to Fix / Troubleshooting
Safety first: Turn OFF power at the breaker. Some sensors are in contact with hot water—allow the tank to cool if necessary.
- Locate sensor: On electronic models, find the tank temperature sensor(s) inserted into wells on the tank or attached to the surface.
- Inspect wiring: Check the sensor harness for damage or loose connectors at the control board. Reseat connectors.
- Check for moisture: Look for leaks around sensor wells or grommets. Repair leaks and dry connectors thoroughly.
- Test sensor: Disconnect the sensor and measure resistance. Compare to Richmond's temperature/resistance chart. Replace the sensor if out of range.
- Control replacement: If a new sensor does not clear E3T, the electronic control board may need replacement.
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Repair Difficulty
Medium
3/5
Required Part
Tank Temperature Sensor
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