E11
Poolworld External Control / Communication Fault

Heater displays E11; may occur when using external automation or remote control

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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

Incorrect wiring to pool automation system, Faulty RS-485 or remote interface module, Loose low-voltage connections, Incompatible control protocol

How to Fix / Troubleshooting

Safety first: Turn OFF power to both the Poolworld heater and any connected automation system before working on low-voltage wiring.

  • Verify wiring: Compare the low-voltage wiring between the heater and automation panel to the Poolworld wiring diagram. Ensure polarity and terminal assignments are correct.
  • Check connections: Tighten all low-voltage terminal screws and reseat plug-in connectors for the communication module.
  • Test in local mode: Disconnect the external control wires and operate the heater from its local keypad. If E11 disappears and the heater runs normally, the issue is with the external control system or wiring.
  • Update settings: Confirm that the heater is configured for external control in its menu (if applicable) and that the automation system is set to the correct heater type.

Warning: Incorrect low-voltage wiring can damage communication ports. If unsure, consult a pool automation specialist.

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Repair Difficulty

Medium 3/5

Required Part

Communication Interface Module
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