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HomeRepair HelpLennox Central A/C RepairLennox Central air conditioner leaking at furnace or air handler Repair
Lennox Central air conditioner leaking at furnace or air handler
Is your Lennox central air conditioner leaking water at the furnace or air handler? The most likely cause is an evaporator coil that is not tilted toward the drain outlet. When the coil is level or angled incorrectly, condensation can miss the drain opening and overflow. A cracked evaporator drip tray is the next likely cause, especially if water is leaking without the tray overflowing. A cracked condensate drain pan can cause the same ac condensate leak and may leave water under the furnace from the AC. Less commonly, a clogged condensate drain tube or drain trap backs up water from the evaporator drain pan and causes the air handler to leak. Turn off power to the unit before inspecting or clearing the drain, and use caution around electrical components. Replacing a drain pan (also called a drip tray) is generally a manageable DIY repair, but correcting coil positioning or working on the sealed refrigerant system requires a licensed HVAC technician with EPA 608 certification. Enter your Lennox model number to find the exact replacement drip tray, condensate drain pan, or other central air conditioner part for your specific unit.
01 - Evaporator Coil Not Tilted Toward Drain
To help the condensate water to flow towards the drain outlet in the pan, most installers will tilt the evaportor coil slightly towards the drain hole. If the evaporator coil is not level, or tilted incorrectly, water will not flow to the drain hole and may overflow the pan.
Common
02 - Lennox Central Air Conditioner Drip Tray
The evaporator is normally tilted slightly towards the drain hole to help the water to drain properly into the drip tray. If water is leaking from the drip tray but the tray is not overflowing, the drip tray is likely cracked and will need to be replaced.
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Common
03 - Lennox Central Air Conditioner Drain Pan
The evaporator is normally tilted slightly towards the drain hole to help the water to drain properly into the drain pan. If water is leaking from the drain pan but the pan is not overflowing, the drain pan is likely cracked and will need to be replaced.
Common
04 - Clogged Drain Tube or Drain Trap
When the air conditioner is running, condensation forms on the evaporator coil and drips into a drain pan. From there the water is directed through a pipe with a trap to a floor drain or condensate pump. If the drain tube or trap gets clogged, the water will back up and overflow the drain pan. If water is leaking from the evaporator pan, it is likely the drain tube or trap is clogged and will need to be cleared to allow the water to flow normally. Be sure to shut off the power to the unit before attempting to remove the clog.
Less Common
Frequently Asked Questions
Why is my Lennox air conditioner leaking water at the furnace or air handler?
How do I fix an air conditioner condensate leak from a clogged drain tube or trap?
How can I tell whether the Lennox evaporator drain pan or drip tray is cracked?
Can I replace a Lennox evaporator coil if it is causing the air conditioner to leak water?
How do I find the correct Lennox drain pan or drip tray replacement part?
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