F15
Thermeau
External Control / Communication Fault (Remote or BMS)
Display shows F15; heater may start but then shuts down with no obvious mechanical issue.
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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 of external thermostat or automation to Thermeau terminals, Shorted remote control cable, Incompatible control signal, Faulty communication port on control board
How to Fix / Troubleshooting
Safety first: Turn off power before changing any wiring connections.
- Check external control wiring: Locate the remote/automation terminals on the Thermeau control board. Verify that wires are connected according to the installation manual and that there are no shorts between terminals.
- Temporarily disconnect remote: Remove external control wires and configure the heater to local control mode. Restore power and see if F15 clears and the heater operates normally.
- Inspect cable: If F15 only occurs when the remote is connected, inspect the cable for damage or water intrusion.
- Verify compatibility: Ensure the automation system is configured to send the correct type of signal (dry contact vs. voltage) expected by the Thermeau heater.
- Board port check: If wiring and remote are good but F15 persists, the communication port on the control board may be defective and require board replacement.
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Repair Difficulty
Medium
3/5
Required Part
Thermeau Control Board
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