In the one indoor unit, he said the air filter was so clogged that it was blocking the airflow.
It was quite a few years back when we had our ductless mini split air conditioner installed. The HVAC professionals back then were asking if we wanted to enroll into their air conditioner service plan which would cover all tune-ups, cleanings, and air filter washes. I decided to pass on the air conditioner service plan because I thought we would be able to handle everything just fine. Well, we kept up with regular air filter cleanings in the beginning, but then started slacking. The HVAC continued to work over the years, until one of our indoor units quit working altogether. We couldn’t deal with this sort of problem, so I called for HVAC service. The HVAC professional said that we not only were supposed to keep the air filters clean, but we also had to replace them after a few years. He explained the air filters were entirely filthy and also too torn up to continue to use. In the one indoor unit, he said the air filter was so clogged that it was blocking the airflow. That inturn caused the fan motor to burn out, so that had to be replaced. We had a very expensive repair bill when everything was completed, but at least we had our air conditioning working again. The guy this time asked if I would like to enroll in their air conditioning service plan because it would be highly beneficial. I couldn’t pass up this time, because I didn’t want any more costly repair bills down the road just because I was being careless with the HVAC maintenance.