E07
A.O. Smith
Inlet Temperature Sensor Failure
A.O. Smith water heater shows E07; unit may shut down or run erratically
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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 inlet thermistor, Loose or corroded sensor connector, Sensor damaged by overheating or moisture, Control board input fault
How to Fix / Troubleshooting
Safety: Disconnect power and close gas and water valves before opening the unit.
- 1. Locate inlet sensor: Find the inlet thermistor on the cold water inlet or near the mixing valve assembly.
- 2. Inspect connection: Unplug and re-seat the sensor connector on the control board. Look for corrosion or moisture; dry and clean as needed.
- 3. Visual inspection: Check the sensor body and wiring for cracks, cuts, or signs of overheating. Replace if damaged.
- 4. Replace sensor: If the wiring is intact but E07 remains, install a new OEM inlet temperature sensor.
- 5. Board diagnosis: If a known-good sensor still triggers E07, the control board may have a failed thermistor input and will need replacement by a technician.
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Repair Difficulty
Medium
3/5
Required Part
Inlet Temperature Sensor (Thermistor)
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