Boiler shows A15; condensate fault, unit shuts down.

Safety: Switch off power. Condensate is mildly acidic; wear gloves and eye protection.

• 1. Inspect condensate pipe: Check the plastic condensate discharge from the Brötje boiler to the drain. Ensure it is not frozen, kinked, or blocked.
• 2. Clean condensate trap: Remove the trap under the boiler, empty it, and rinse with clean water. Remove any sludge or debris.
• 3. Check slope: Ensure the pipe runs continuously downhill to the drain with no upward loops that can trap water.
• 4. Level sensor: If your model has a condensate level sensor, inspect and clean it. Replace if corroded or not switching.