E04
Clearwater Low Voltage / Power Supply Fault

E04 appears and the display backlight may flicker; unit may reset randomly.

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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

Defective Clearwater AC adapter, Loose low-voltage connector at control board, Shared circuit with heavy loads causing voltage drop, Internal power supply fault on main PCB

How to Fix / Troubleshooting

Safety first: Unplug the power adapter from the wall before inspecting wiring. Do not work on live electrical parts.

  • Check outlet: Plug a lamp or tester into the same outlet to confirm it has stable power.
  • Inspect adapter: Verify you are using the original Clearwater 24V (or model-specific) adapter. Check for damage, frayed cable, or a warm/burnt smell. Replace if suspect.
  • Secure connections: Remove the control head cover and ensure the low-voltage plug from the adapter is fully seated on the Clearwater control board.
  • Avoid shared heavy loads: Move the adapter to a dedicated outlet not shared with pumps, freezers, or large motors that can cause dips.
  • Reset controller: After securing power, unplug for 2 minutes, then reconnect. If E04 persists, the internal power supply on the board may be failing.

Board-level repairs should be done by a professional; in most cases the Clearwater main control board is replaced as a unit.

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Repair Difficulty

Medium 3/5

Required Part

Clearwater AC power adapter
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