A damaged drain pan can cause basement flooding when it melts due to furnace overheating, which typically results from poor airflow caused by a clogged evaporator coil combined with a faulty high limit switch that allows the system to overheat; proper HVAC maintenance including regular coil cleaning and high limit switch replacement prevents this type of damage.
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This Drain Pan MELTED and Flooded the Basement!Added:
The drain pan literally melted and flooded the entire basement.
This customer called us because they had water everywhere, but nothing was making it into the condensate pump.
The drain pan was completely warped and melted, letting all that water pour straight into the furnace.
This doesn't just happen overnight.
This was years in the making.
Most likely caused by a poor airflow from a heavily clogged evaporator coil combined with a faulty high limit switch that allowed the system to overheat.
So, here's what we did.
First, we removed the coil and gave it a full cleaning to restore proper airflow.
Then we installed a brand new drain pan and slid the evaporator coil back into place.
The high limit switch had already been replaced over the winter, so that issue was taken care of.
After that, we brazed the coil back in with a new filter dryer, flushed nitrogen through the system, and pulled a vacuum to make sure everything was clean and leak-free.
We got everything sealed back up, and now it's draining exactly how it should, straight into the condensate pump. No more flooding.
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