Even when the compressor is not running in cooling mode and just the fan is spinning it is producing a musty smell. Where could the smell be coming from and how can I clean it? This unit does not have a tank, it re-distributes the water in cooling mode.
What would cause a musty smell from the portable A/C unit
hvac
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Best Answer
What I have found is the drain has gotten plugged in tha back outside section, dust builds up and plugs the hole , the other thing I have found that causes portables to smell musty is when they are installed level. There is supposed to be a tilt to the back so the condensate will run to the back and drain outside. There are special cleaners for AC systems make sure to use non acid based cleaners and flush with clear water. Acid based cleaners are very hard on the cooling fins and can start corrosion that will shorten the units life. I would want to flush my unit if musty and make sure it is draining completely or the smell will come back after cleaning .