E11
Aquaflow External Communication / RS-485 Error

Display shows E11 and pump cannot be controlled from external automation system

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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 polarity on RS-485 terminals, Broken communication cable, Incorrect baud rate or protocol settings, Shorted data lines

How to Fix / Troubleshooting

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

  • Verify wiring: Check that the RS-485 A/B (or +/–) wires from the automation system are connected to the matching terminals on the Aquaflow control board. Correct any reversals.
  • Inspect cable: Look for cuts, kinks, or water damage along the communication cable. Replace if damaged.
  • Check termination: Ensure that termination resistors are installed only where required by the system design.
  • Confirm settings: In the Aquaflow menu (if accessible), verify that the communication address and protocol match the automation controller's configuration.

After correcting wiring and settings, restore power and clear E11. If the error persists, the communication interface on the control board may be faulty.

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Repair Difficulty

Medium 3/5

Required Part

Aquaflow control board assembly
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