Outdoor heat pump very loud - options? Silent mode? Effects?

What I find strange is that the device runs almost all day and all night.

Well, on the one hand that's optimal, but on the other hand, there will be nothing left to throttle in terms of performance. Then perhaps 's suspicion after all.

What I find strange is that the device runs almost all day and all night. Despite the buffer storage.

Perfect. But remove the night setback. It is counterproductive. Better to let it run slowly than to catch up on the temperature lost overnight at full blast (= loud) in the morning.

Do you have a photo of the conditions?

It's perfect. But take out the night setback. It is counterproductive. Better to let it run slowly than to have to catch up the temperature lost overnight at full power (= loud) in the morning.

Does the night setback even help? I have disconnected the ERR. The room temperature on the heat pump is set to 20 degrees during the day and 18 degrees at night.

Night setback can help to use a bit more own photovoltaic electricity. You have to look at it closely.

do you have a photo of the conditions?

Unfortunately, the conditions are unfavorable. The device is hanging towards the neighbors, as the supply lines come from the right.

The neighbor has his window 3 meters behind the fence. However, the device was already there when he started building. Also without a fence at that time.

If we hang the device under the lamp, I am afraid we will hear it even louder.