Locate the condensate drain, which is usually on the rear or side of a Lennox furnace.
Disconnect the drain from the condensate pan. Hold an empty pan under the drain to catch any water once the drain is disconnected.
Run a small metal wire up into the drain to clear out any debris.
Empty out the drain pan and reconnect the drain to the condensate drain pan.
Tighten the drain connection with a wrench to prevent leakage from a loose drain tube.
Things You Will Need
- Empty pan
- Metal wire
- Contact Lennox for assistance if the furnace still leaks after draining the condensate pan.