Unless you like trying to get your duct cleaning company to pay for a blown furnace circuit board, make sure you keep your condensate line clear and check it often after you get your ducts cleaned.
We had our ducts cleaned at the end of April, which they do by cutting holes in the ducts near the plenum chamber and running a vacuum to pull everything from the vents back to those access ports. What they are supposed to do is to put an inflatable pillow behind the access port so dust and debris doesn’t get pulled back into the chamber and settle on the A-coil.
Well, these guys didn’t do that. We had about a month of cool weather following the cleaning where we didn’t need to run the air conditioner, so it just sat there until the first hot day. In the morning, the air was blowing nice and cold, but by afternoon it was just blowing warm air through the ducts. When I got a service technician in, he noticed a thick slurry of dust and debris plugging the condensate line. The water had overflowed and dripped throughout the furnace, shorting out the control board and leaving a nice big black scorch mark.
It was a $600 repair, and the duct cleaning itself was around $650. I’m currently working with the duct cleaning company to get reimbursed for the repair — I don’t think they’re going to see much profit out of this particular job.











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