3 sourced reports, with what to check before you buy. Each one links to the page it was reported on.
Costly or dangerous
Mainboard replaced, drive-wheel frame broke, then 'Unit temperature protection' error — Estonian consumer regulator upheld refund
An official Estonian Consumer Complaints Commission decision (case 19-1/25-07524, 25.08.2025).
What to check. This is a regulator decision, the strongest source type. The unit needed a mainboard replacement, then the drive-wheel frame broke, then the battery drained fast and the robot threw a 'Unit temperature protection' error and disconnected from the dock/app. The commission ordered the seller to refund the full €1219. Expect multi-week service turnaround (five weeks each visit) and recurring faults that can end in full refund rather than repair.
Recurring water leakage from the bottom, plus charging error — Turkish owner complaint
Turkish complaint site Şikayetvar, S8 Pro Ultra water-leakage category.
What to check. A Turkish owner reports water leaking from the unit two weeks after purchase, followed by a charging error, and four service visits that returned the unit unrepaired. This is a documented water-leakage failure mode in the TR market with poor service resolution.
Error 1 tied to the LDS laser unit — German owner forum
Galaxus (German) question-and-answer thread for the S8 Pro Ultra.
What to check. A German owner got Error 1 within about a month of ownership; the fix discussed is manually rotating the top laser unit and restarting. This is a known, usually recoverable fault, but it can recur and points to the LDS turret as a weak spot.
These reports come from the pages linked under each item: owner forums, repair guides and workshops. They are not a diagnosis of any one unit, and a careful check of the one you are buying still applies.
Text from the Kriko Robot vacuums catalog, version 0.1.2, under the CC-BY-SA-4.0 license.
