Boiler condensate trap overflows or water drips from bottom during operation

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

• Step 1 – Inspect drain line: Follow the condensate hose from the trap to the drain. Straighten any kinks and ensure proper downward slope.
• Step 2 – Check for freezing: In cold areas, look for ice in the line. Thaw gently and insulate or heat‑trace the line.
• Step 3 – Clean trap: Remove the condensate trap per Navien instructions, empty it, and rinse out debris. Refill with clean water before reinstalling to maintain the water seal.
• Step 4 – Verify drain connection: Ensure the end of the condensate line is not submerged in standing water, which can cause backpressure.

Do not operate the boiler with a disconnected or leaking condensate system; corrosive condensate can damage surrounding materials.