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Timothy Davis Jr.Sep 13, 2025
What does S05 error mean on A.O. Smith Water Heater?
- AAnna CortezSep 13, 2025
The S05 error on your A.O. Smith water heater means there is an open circuit from dummy 2. This can occur if: * The dummy is not correctly connected. Connect the dummy sensor (dummy sensor 1 and 2) leads to JP4. * The dummy is defective. Replace the dummy sensor.
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