Condensate water backing up or dripping from inside the Ferroli condensing furnace.

Safety: Condensate is mildly acidic; wear gloves and eye protection when handling. Turn off power before opening the trap.

Steps:

• Check external pipe: Ensure the condensate pipe outside is not frozen or blocked. Thaw gently with warm (not boiling) water if frozen.
• Clean trap: Remove the Ferroli condensate trap (usually a plastic cup) and flush thoroughly with clean water to remove sludge.
• Reassemble and test: Refit the trap, ensuring seals are in place, then restore power and run the unit, checking for leaks.

Professional help: Persistent condensate issues may require rerouting the drain or checking the heat exchanger for internal blockage.