All Thermor error codes
This page brings together Thermor error codes sorted by type of failure: what each code means, its likely causes, and what you can safely check before calling a professional.
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The Thermor codes on this page, grouped by type of failure.
Temperature sensor — Thermor
These codes indicate a sensor that’s no longer returning a consistent value. The issue almost always comes from the sensor itself or its connector, rarely from the unit.
Code E09Medium severityair-to-water
Water temperature too hot (> 80 °C)
Possible causes
- Water temperature too high in the tank
Models affected: Aéromax 5, Aéromax 6, Aéromax Premium
This issue requires a qualified technician. Do not open the unit.
All Thermor codes published on the site
This list updates automatically whenever a new guide is added.
Technical information provided for guidance only, based on manufacturer documentation and field feedback. It does not replace the diagnosis of a qualified professional. Found an error on this page? Report it.