ᐅ Air-to-Water Heat Pump: Icing Up, Noisy, Continuous Operation?

Hello,

I am new to this topic and have a few questions:
We are currently in the final phase of building our house and have received our heating system (still connected to construction power). The building is currently being "dried out."
Points that I am not satisfied with at the moment:

1. Unfortunately, the outdoor unit was installed on the house wall and not decoupled as discussed (the plan was to place it on the garage or in front/next to the house). What can still be done to fix this? As is often the case: nothing was documented in writing.

2. What I have noticed: the side vent of the outdoor unit is partially frozen at 8-13°C (46-55°F) or completely iced over at the moment, with temperatures of 6°C (43°F) or lower down to -5°C (23°F). I have not yet seen the defrost function "in action," but I am only on site for a few hours to talk to the contractors or ventilate. In the settings (which I have only briefly looked at), I only see "99% load" and the second heat source is "active" continuously. Is that normal? The room temperature is currently set to 24°C (75°F), and it is around that temperature as well.

3. I find the outdoor unit very loud and I am worried that this might cause issues with my neighbor. For example, I can feel vibrations throughout the house, I can hear the outdoor unit upstairs, and it is not very quiet outside either. The fan runs almost continuously at a high level, and the system rarely slows down. It is annoying.

The plumber has already come and adjusted something (I don’t know what exactly), and the manufacturer’s service has also been on site. So far, it has not helped much.

House information:
KFW55 city villa, 140 sqm (1,507 sq ft), detached, 24cm (9.5 inch) lightweight concrete with 18cm (7 inch) external thermal insulation composite system (ETICS), decentralized ventilation (Inventer), air-to-water heat pump (Weishaupt WWP L 7 AERS with 200-liter (53 gallons) domestic hot water tank), underfloor heating throughout, outdoor unit directly next to the utility room.

I hope you can provide some guidance, as I have been following this forum for a while.

If a drying program is running, it probably operates at maximum power. Wait until normal operation begins and then decide if it is still bothersome.

Thanks in advance.
I’m just concerned (and wanted to point it out early) that when the heating system ramps up later, it might be the same. Currently, sleeping or working isn’t possible due to vibrations in the house and noise levels.
Is icing really normal even at high outside temperatures?
The heating has been running for weeks now... Interior work is scheduled to start in calendar week 49 (tiling, etc.).
So far, only a few issues have come up; the work seems to have been done well overall, mostly with branded products and local craftsmen.
I think it’s still advisable to have a specialist involved for the final inspection (after the blower door test in February), right?

Everything should be fine, but get ready for the electricity bill...

Later on, the system will rarely operate at full capacity... then it will be quieter...

Still, you can expect the fan to run occasionally, so the system will be audible.

If you want it decoupled, you’ll need to talk to your contractor, who can do this for an additional charge.

The icing is normal... it’s basically a reversed refrigerator...

I have also realized this with dismay... And the construction power (which is said to be cheap according to Bt) is 10 cents more expensive than the regular electricity... So I’ll wait and see...

The fact that your outdoor unit is so loud would bother me a lot. Our Vaillant with a Papst fan is even discreet and quiet at full power... No vibrations at all!?