Water leaking around the base of a high-efficiency Trane furnace

Safety: Turn off power before working near water and electrical components.

Steps to check:

• Inspect drain tubing: Locate the PVC or vinyl condensate drain lines from the furnace and secondary heat exchanger. Check for kinks, sags, or disconnections.
• Clear trap: Remove the condensate trap (if accessible) and flush with warm water to remove slime and debris.
• Flush drain line: Use a wet/dry vacuum at the drain termination to pull out clogs, or flush from the furnace end with water.
• Check slope: Ensure drain lines slope continuously downward to the drain.

When to call a professional: If the condensate collector box is cracked or leaks persist, a technician should replace damaged components and verify proper venting and drainage.