Boiler condensate pipe drips or gurgles loudly, with occasional lockouts in cold weather.

Safety: Condensate is mildly acidic; wear gloves when handling.

• Check for freezing: In cold weather, inspect the external condensate pipe for ice. Thaw gently with warm water and lag the pipe to prevent recurrence.
• Verify pipe fall: Ensure the condensate pipe slopes continuously downward to the drain with no sags.
• Clean trap (engineer level): Remove and clean the Thermona condensate trap and refill with water before refitting.
• Re-route pipe (engineer level): If the external run is long or exposed, consider re-routing internally or increasing pipe diameter as per Thermona guidelines.