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Noisy Fujitsu aircon unit - Bethlehem Tauranga

One of my two Fujitsu AOTR12LFC outdoor aircon units has become generally noisier – from 66 decibles to about 80 decibles. It's not clear what's causing the increase in noise, but it sounds more like a diesel compared to a petrol engine. The unit is about 8 years old with average use, mostly heating.