Inverter Cooling Fan Noise

It is only discussed beeping sound or alarm sounds but my inverter makes swooshing noise getting louder then getting completely silent like a fan operated by regulator whether it is cooling fan if any that is inside.
Inverter cooling fan noise. Integrated noise damping system a virtually silent fan and compressor for super quiet performance. Inverter cooling fan noise not sure what the history on the fan has been but you may need to clean out dust and fur like cleaning the coils under a fridge. If so why it comes only sometimes that too only during charging when mains are on. But it has a very noisy cooling fan and the whole point of the cabin is to get a little peace quiet.
Streamline floor ceiling inverter air conditioning systems 48000btu 210 500 00. As soon as the increased fan activity is able to cool down the inverter the circuit automatically steps back to state 2 and later to the calming state 1. The fan isn t a problem during the day but at night when things are quiet it is really noticeable if you were using it to say just power a light.