Another Liebherr freezer bites the dust
12 August 2025
When you invest in what's supposedly premium laboratory equipment, you expect reliability. What you don't expect is the third freezer to die in just 2½ years. This time it was our Liebherr LGex3410 Mediline Spark Free upright freezer, which was a mere 2½ years old.
The Familiar Pattern of Failure
The incident occurred at 11 pm during my holiday, when the freezer was operating normally at -18.8°C. What happened next was disturbingly familiar: complete electrical failure, identical to our previous small underbench Liebherr Mediline freezer. No warning, no gradual decline – just death. Again, some useful information comes from the temperature recording system:
22:15: Normal operation at -18.8°C (failure occurs shortly after)
00:23: Alert threshold reached at -15°C (monitoring system triggered)
2 AM: -13.4°C
4 AM: -11.6°C
6 AM: -9.9°C
9 AM: -7.4°C when contents were finally rescued
© RudolphLAB, 2025
The larger upright model held its temperature marginally better than the smaller underbench unit during the failure. However, it is important to note that even short power interruptions of 2-3 hours (such as those required for routine electrical maintenance) cause very significant temperature increases in these units. Any power interruptions, if planned, needs to be communicated and carefully planned so that the affected freezers can be moved to a safe location so that sample integrity can be maintained.
The Silent Treatment: Liebherr's Design "Feature"
One engineering failure of these Mediline units is that when these freezers suffer complete electrical failure, they don't provide any audible alert via a backup alarm system. The machine simply appears to be switched off, offering no indication to casual observers that thousands of pounds worth of samples are slowly warming to destruction.
We checked the socket and plug fuse – both in perfect working order. The freezer itself had simply died, exactly as our other Mediline model. Without our temperature monitoring system, this failure would have gone unnoticed until I would have returned two weeks later, with the entire content being entirely ruined.
A Team Response
Fortunately, this time our monitoring system caught the failure and issued an alert when the temperature reached -15°C. While I was asleep at 00:23 (as one tends to be at that hour), the morning brought both the bad news and the opportunity for our technical team to shine. Massive credit to Rooban and Helen, who responded immediately when I alerted them to the situation. Their rapid action meant that while the -10°C threshold had been breached, the contents were still safely frozen at -7°C when they moved everything to our backup freezer.
The Liebherr "Quality" Experience: A Reassessment
I used to believe that Liebherr represented quality engineering and reliability in laboratory equipment. Three failures in 2½ years have comprehensively disabused me of that notion. When a 2½-year-old freezer develops exactly the same fault as another unit it is very tempting to assume that this isn't bad luck, but a pattern.
For the foreseeable future, our laboratory will be steering well clear of Liebherr products. There are other manufacturers who understand that laboratory equipment needs to be both reliable and designed with appropriate fail-safes. When equipment failure is inevitable, the very least we should expect is adequate warning systems that don't require expensive third-party monitoring to prevent sample loss.
While our monitoring system and team response turned this potential disaster into a manageable incident, the underlying problem remains: laboratory equipment that fails silently and frequently is simply unfit for purpose. I believe Liebherr has produced very good units in the past. Perhaps these failures are a glitch. But I do not think so. Perhaps it's time for Liebherr to remember the quality they are known for.