Compressor broken after 6 years (Ecoforest ground heat pump / well construction Heth)

After 6.5 years, the compressor of our ground source heat pump is broken.

The lifespan of such compressors is stated to be 25-30 years.

Has this ever happened to anyone else?

Was the heat pump possibly installed incorrectly or what caused the damage?

In addition:
The installing company Brunnenbau & Erdwärme Heth from Lorsch refuses to carry out the repair, citing a shortage of skilled workers.

Overall, no official Ecoforest partner could be found to perform the repair; a local climate and refrigeration company will now take over the repair.

It is an Ecoforest geothermal heat pump (Model C3 3-12KW HTR EH) with a Copeland Scroll compressor ZPV36K1E-1E9-130.

Was the 12kW heat pump perhaps oversized for our house ([Es laufen 190 qm Fußbodenheizung und das Warmwasser für 5 Personen über die Erdwärmepumpe]. The house is almost KfW-55 standard: final energy demand: 21.4 kWh/(m^2*a) / primary energy demand: 51.4 kWh/(m^2*a) / energetic quality of the building envelope: 0.25 W/(m^2*K))?

what caused the damage?

Sometimes things just break. That's bad luck - nothing more, nothing less. It's just a technical device.
The lifespan is not determined by years, but the years are calculated based on average usage. If you now have a heat pump that starts up 56 times a day (this is called cycling), then the average usage for you might already be reached after 6.5 years.

Only the specialist company carrying out the repair can tell you exactly what is defective and why.

Yes, bad luck is an option.

I understand that a device with a lifespan of 25-30 years can also last only 15-20 years or sometimes 35-40 years.

But only 6.5 years is very little and very annoying.

The display of the [Erdwärmepumpe] shows:
Hours: 19672
Starts: 57579
Starts/hour: 35.596

The suspicion of oversizing comes from the specialist company. Let's see how it goes.

With a runtime of 2 minutes per start, probably more is wrong than just the sizing

Yes, that is really bad.
Maybe it was incorrect settings or problems with the hydraulics like ERR closing too often, etc.
And definitely also oversized.

Hello,

Something doesn’t add up in your values. Has a comma been misplaced somewhere?

The display of the ground source heat pump shows:
Hours: 19672
Starts: 57579
Starts/Hour 35.596

6.5 years are about 57,000 hours. That would give you a start/hour (which I also think is way too high). And a running time per start of 1/3 h = 20 minutes per start.
What does the "Starts/Hour 35.596" mean then?

Best regards,

Andreas