Model compatibility has not been independently verified
Earlier archive data contained suggested model or series names. Without a clear model/code table in a manufacturer manual, these names are no longer displayed as verified matches.
This is general brand/device guidance; check the model label and official manual.
Open manufacturer sourceWhat does this code mean?
Overheating fault
Meaning and code checked against an official manufacturer source; model-specific applicability still requires confirmation.
Official manufacturer documentBaymak E03 is not the same on every model
Luna Avant 24/31 Fi: E03 denotes an overheating fault according to its official user manual. Brötje Novadens Extra: E03 can refer to a central-heating NTC sensor fault according to its separate official user manual. These meanings must not be combined into one universal diagnosis.
Do not open the appliance or replace a sensor based solely on the error code.
What you can check safely
- 1. Record E03 and the full model label (Luna Avant 24 Fi, Luna Avant 31 Fi). The published meaning applies to the manufacturer-described model family, not every boiler of this brand.
- 2. If you smell gas, do not touch switches, plugs or controls; move to safety and call the local gas emergency number from a safe location.
- 3. If there is no gas smell, observe the external pressure display and any visible warning indicators. Never open the casing, fan, flue, gas valve or electrical connections.
- 4. Check only items expressly permitted by the manual for that specific model. If the fault relates to combustion, gas, a sensor or electronics, leave diagnostics to authorized service.
- 5. If the manufacturer manual explicitly allows a reset, try it only as instructed. Do not repeatedly bypass a safety lockout.
- 6. Tell service the code, model, pressure reading, onset and other symptoms. Qualified staff should confirm the cause by measurements.
What a technician should confirm
Qualified service must use the model-specific service documentation and suitable measurements. Gas, flue, electrical, heating and refrigeration repairs are not safe do-it-yourself tasks.
Verification after service
After manufacturer-authorized inspection, check that E03 no longer appears during ordinary operation. If the warning returns, stop and contact service again.
Listed model family
Luna Avant 24 Fi, Luna Avant 31 Fi
A code may mean something different on another model. Check the complete model identifier before acting.