Furnace indicates condensate fault, may lock out during wet or freezing conditions

Safety: Turn off power before removing the condensate trap. Condensate is mildly acidic; wear gloves and eye protection.

• Check external pipe: Inspect the external condensate discharge pipe for freezing or blockage. Thaw gently with warm (not boiling) water if frozen.
• Clean trap: Remove the Baxi condensate trap, empty contents, and flush with clean water. Ensure the internal baffle is clear. Refill with water before refitting to maintain the seal.
• Verify pipe fall: Ensure the condensate pipe slopes continuously downward with no sags. Adjust supports if necessary.
• Insulate external run: In cold climates, insulate or increase the pipe diameter externally to reduce freezing risk.