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Problem: Why is water leaking on my floor with the air conditioner on? My service man says I need a new evaporator coil.

troubleshooting air condtioners and heat pumps

Problem: Why is water leaking on my floor with the air conditioner on? My service man says I need a new evaporator coil.

Answer: Thanks so much for your interest in our website! Most of the time when water leaks from an air conditioner on the floor the drain line is stopped up. I use compressed air or a wet vac to try and unstop the drain line. Please click here if you would like to see the Wagner Swoosh CO2 drain line cleaner we sell. Water leaking can also be caused by a leaking coil drain pan. The evaporator coil sets in a drain pan. If the pan rusts out and gets holes in it, it will leak. You or the service man would need to inspect the coil to see if the drain pan is leaking. This can be difficult and time consuming since the coil is usually covered up with sheet metal and you need to look under the coil bottom. This may be why your service man says you need a new coil. The coil drain pan is hard to repair and you usually have to take the coil completely out to repair the leak. Water on the floor can also be caused by a coil that freezes up or forms ice. This condition is usually cause by a low refrigerant charge, but can also be caused by a stopped up filter, dirty blower, dirty coil or a motor that is dragging (going bad) and not producing enough air flow. A weak motor run capacitor could cause a motor to not run up to speed. Please click here if you are interested in seeing the capacitors we sell. I hope this helps you in find the problem. Below we have a two real good YouTube videos which show how to clean out an air conditioner condensate drain. Thanks to the Submarine Guy and pcsforpeople1 from making these videos. If you have any questions please feel free to email us: support@arnoldservice.com or comment in our comments section below.  God bless you and your family.

2 thoughts on “Problem: Why is water leaking on my floor with the air conditioner on? My service man says I need a new evaporator coil.

  1. we have a ac unit 3 yrs old a trane, it is leaking water inside from unit channeling all out of the floors, under baseboards and in hallway, front room and kitchen, i had the plummer come out and did a leak dectector test for pipes on house, it wasnt that, dont understand how much water can come out, omg the wooden flooring has to come all out and dried. what a nightmare….

    1. So sorry to hear that you are having this water leak problem! Leaks for air conditioner coils most of the time come from a stopped up condensate drain line or a frozen evaporator coil. I would recommend you have a safety over-flow drain pan installed under the furnace so the pan will catch any water leaks in the future. They sell alarms that can be installed on the drain pans to warn if the pan is getting full of water. Hope you can quickly find and fix what is causing the leak! Steve

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