Vaillant · ecoTEC plus Boilers
The boiler's internal electronics are overheating, possibly due to external factors or an internal component failure.
Click steps to track your progress.
Press the reset button on the boiler display up to three times to try and clear the fault.
Ensure that the boiler's ventilation openings are clear and not obstructed, allowing for proper airflow.
Check for any external heat sources (e.g., other appliances) near the boiler that might be causing the electronics to overheat.
If the fault persists, contact customer service, as the internal electronics might be defective.