AO Smith No Power to Control Head

Softener will not power on; display is blank.

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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

Faulty outlet, Failed transformer, Loose low-voltage connector, Blown internal fuse on control board

How to Fix / Troubleshooting

Safety first: Use caution when working around electrical outlets. If unsure, consult an electrician.

Check external power:

  • Test the outlet with another device or a tester.
  • Ensure any wall switch controlling the outlet is turned on.

Test transformer:

  • Unplug the transformer from the control head and measure output with a multimeter.
  • If there is no output, replace the transformer with the correct AO Smith part.

Inspect control head:

  • Check the low-voltage connector at the control board; reseat it.
  • If the board has an accessible fuse, test and replace it with the same rating if blown.

If the transformer is good and connections are secure but the display remains blank, replace the electronic control board.

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Repair Difficulty

Medium 3/5

Required Part

24 VAC Power Transformer
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