Boiler shows E14; condensate may be present around the base; burner shuts down.

Safety: Isolate power. Condensate is mildly acidic; wear gloves and eye protection when handling.

• Check external pipe: Inspect the external condensate discharge pipe from the CTC boiler. In cold weather, look for ice blockages. Thaw gently with warm (not boiling) water or a warm cloth.
• Inspect condensate trap: Remove the boiler front cover and locate the condensate trap. Place a container beneath and carefully remove the trap. Empty and rinse with clean water to remove sludge.
• Check hoses: Ensure internal condensate hoses are not kinked or blocked. Refit securely to prevent leaks.
• Reassemble and test: Refit the trap, restore power, and reset the boiler. Observe for normal operation and absence of leaks.