Air heat pump is not heating, but the hot water works

Am I entitled to have someone share the additional costs?

However, it would certainly be helpful to know what is broken. Regardless of that, I would hold your contractual partner liable under the warranty and announce that you will charge the additional costs. However, it certainly will not be a huge amount.

First post, second sentence.

So far, none of the technicians and craftsmen who were on site have been able to tell me what the issue actually is.

Summary is:
01.10. - Problem reported to the sanitary company.
02.10. - Sanitary technician on site, could not solve the problem but read the error "min overheated" and handed it over to the technician from Tecalor.
08.10. - Technician from Tecalor was on site and said that the expansion valve of the outdoor unit was defective. Apparently, he did not even notice that the heating is not running and only focused on the error "min overheated". Later on the phone, however, he told me that in emergency operation both hot water and heating should be running. If not, I should inform the sanitary company again. Heating does not run even in emergency operation and the sanitary company has already been informed by me.

In any case, the Tecalor technician will only come on 15.10. to install the new valve. I have serious doubts whether the heating will work then.

According to the description, no. I would get a third plumber who is specialized in heat pumps and have them take a look. Or, as already mentioned, just check it yourself. Ownership comes with responsibilities, and you should know how your own heating system works. In the [Rosa Forum], you will certainly get help faster than with all the plumbers and technicians. Although you can continue to rely on the duties of the construction company, which you are probably right about, your place won't get warm from that.

The system seems to be running now...

The heating engineer did not bleed the system and did not check the whole thing last week either. He filled it with water but did not bleed it. Due to the large amount of air in the system, it has permanently affected the expansion valve of the outdoor units and caused it to fail.

It can be that simple and stupid. The plumber is not coming into my house anymore.

Regards

System is apparently running now...

The heating engineer had not bled the system and also did not check it last week. He topped up the water but did not bleed it. Due to the large amount of air in the system, this has eventually affected the expansion valve of the outdoor units and caused it to fail.

It can be that simple and stupid. That plumber will never come into my house again.

Regards

Ok, and who services your system annually?