Daikin high-efficiency furnace is leaking water around the base or inside the cabinet.

Safety: Turn off power before working around water and electrical components. Dry any standing water promptly.

Steps to check:

• Locate source: Remove the furnace panels and observe where water is originating—secondary heat exchanger, collector box, or external drain tubing.
• Clean trap and line: Remove and flush the condensate trap and drain line with warm water and a small amount of bleach or vinegar to clear slime and debris.
• Check connections: Tighten hose clamps and push-fit connections on the condensate outlets and pump (if used).
• Verify slope: Ensure the drain line slopes continuously downward to the drain and is not sagging.

If the collector box or heat exchanger appears cracked or leaking, shut down the furnace and have a Daikin technician inspect and replace the damaged parts.