A.O. Smith Single Element Operation or Thermostat Misadjustment

Water is warm but not hot enough from A.O. Smith electric water heater

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.

Possible Causes

Failed lower heating element, Lower thermostat not switching, Thermostats set too low, Sediment covering lower element

Safety: Turn off power at the breaker and verify with a meter.

1. Check thermostat settings: Ensure both upper and lower thermostats are set to the same desired temperature.
2. Test lower element: With wires removed, measure resistance across the lower element. Replace if open.
3. Inspect lower thermostat: Replace if it does not energize the lower element when the tank is partially cooled.
4. Flush sediment: Drain and flush the tank to expose the lower element and improve heat transfer.

Medium 3/5

Lower Heating Element

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