E14
A.O. Smith
Thermostat / Setpoint Sensor Fault
A.O. Smith water heater shows E14; unit may not respond to thermostat changes
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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 internal temperature sensor in gas control, Faulty electronic thermostat module, Loose sensor harness, Control board failure
How to Fix / Troubleshooting
Safety: Turn gas control to OFF and disconnect power before servicing controls.
- 1. Check setpoint: Attempt to adjust the temperature setting. If the display does not change or responds erratically, suspect a control fault.
- 2. Inspect harness: On models with separate sensor harnesses, ensure all plugs between the thermostat, sensors, and main board are fully seated.
- 3. Reset control: Power the unit off for several minutes, then restore power and reprogram the temperature.
- 4. Replace thermostat/control: If E14 remains, replace the gas control valve/thermostat assembly or the electronic thermostat module with an OEM part.
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Repair Difficulty
Hard
4/5
Required Part
Gas Control Valve/Thermostat
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