Heater shows E15; unit may not respond to control commands or remote signals.

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.

Possible Causes

Incorrect wiring to external control terminals, Shorted communication bus, Incompatible automation system connection, Faulty external control module

Safety: Turn off power before modifying any control wiring.

Steps:

Isolate external controls: Disconnect any external thermostat, BMS, or pool automation wiring from the Fairland control terminals.
Test standalone: Power the unit and attempt to operate it using only the built-in control panel.

If E15 clears when external controls are removed:

Review the Fairland wiring diagram and the automation system manual to ensure correct connection and signal type.
Replace or reconfigure the external control module if it is causing bus errors.

Medium 3/5

External Control Interface / Communication Terminals

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