E12
AquaFlo External Communication / RS-485 Bus Error

Pump shows E12 and cannot communicate with external automation system (e.g., pool controller).

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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

Reversed RS-485 polarity, Broken communication cable, Incorrect AquaFlo address or protocol setting, Faulty automation interface port

How to Fix / Troubleshooting

Safety first: Turn off power to both the AquaFlo pump and the automation system before working on low-voltage wiring.

  • Verify wiring polarity: Check the RS-485 or communication terminals on the AquaFlo control and the automation panel. Ensure A/B (or +/–) are matched correctly and that shield/ground is connected as specified.
  • Inspect cable: Look for cuts, kinks, or water damage along the communication cable. Replace if any damage is found.
  • Check address and mode: Enter the AquaFlo setup menu and confirm the communication address and protocol match the automation system requirements.
  • Test point-to-point: Temporarily connect the pump directly to the automation panel with a short known-good cable to rule out wiring issues.

If E12 persists with correct wiring and settings, the communication interface on the control board or automation panel may be defective.

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Repair Difficulty

Medium 3/5

Required Part

AquaFlo Automation Interface Board
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