Boiler displays E13; may be related to a condensate system malfunction.

Safety: Condensate is mildly acidic. Wear gloves and eye protection when handling.

Steps:

• Inspect condensate trap: Remove the condensate trap from the bottom of the Attack boiler. Empty and flush it with clean water to remove sludge.
• Check condensate pipe: Follow the plastic pipe to its discharge point. Ensure it is not frozen, kinked, or blocked. Thaw gently with warm (not boiling) water if frozen.
• Reassemble and test: Refit the trap securely, ensuring seals are in place. Restore power and reset the boiler.

Technician: If E13 persists, a service engineer should check for internal condensate leaks or sensor faults.