E30 error, often associated with condensate or flue system problems on condensing models.

Safety: Turn off power and gas. Risk of flue gas leakage if flue is compromised.

• Check condensate trap: Remove and clean the trap, ensuring the internal baffles are clear. Refill with clean water before refitting.
• Inspect condensate pipe: Ensure the pipe is not frozen, kinked, or blocked. Thaw gently if frozen and improve insulation or routing.
• Verify flue installation: Confirm that the flue has the correct fall back to the boiler as per Chaffoteaux instructions. Incorrect slope can cause condensate pooling.
• Dry combustion chamber: If water has entered the combustion area, dry components and identify the source of ingress.