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Drain Problems on American Standard A/C and Heat pump

\015 I have 18 month old 15 seer A/C Unit. I cleared the drain line that goes from the unit inside my garage to the outside. I have cleaned the drain pan and cleared anything the might clog the drain holes. Problem is it is still overflowing the water onto the floor of garage. The coils have been cleaned also just in case that might be the problem. I have run out of answers.\015

Answers :

You have a plastic condensate pan and you could have developed a crack in it. But most likely, there is still something that is clogging the drain. You may need to run a snake through it instead of using air. If you ran a snake through then it's probably a crack. Sometimes the crack can be at the outlet where something might have hit the pipe. Also, if the unit has a "draw through" coil, then there needs to be a p-trap installed on the unit to keep water from being drawn back into the unit while it is running. If it is a "blow through" coil and a p-trap is installed then remove it. The p-trap can restrict the flow of water leaving the unit and the least bit of debris can cause the unit to overflow. Draw through means the blower motor is pulling air over the coils and sits over top of the coil. Blow through means that the blower is pushing air into the coils and sits down below the coil. Hope this helps.

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