Vaillant · ecoTEC plus Boilers
The temperature of the boiler's electronic components has become too high. This could be due to external heat effects or a defect within the electronics itself.
Click steps to track your progress.
Ensure the boiler area has adequate ventilation and is not obstructed by objects.
Check for any external heat sources near the boiler that might be causing it to overheat.
If the error persists, contact a qualified service technician as this may indicate a fault with the internal electronics.