Yesterday my heat pump showed an error: A9. A search in the manual showed that I would definitely need to contact the specialist company.
Great…
Time-wise, the whole thing was after any support times.
So I researched on the Internet. However, I didn’t really get anything out of it, except for one article that suggested an old IT trick:
Switch off, switch on.
No sooner said than done. And lo and behold, it’s been running smoothly ever since.
(I can’t say whether that was really the best solution.)