What to do if Maquet Heater shows “TEMP >= 40°C” alarm?
- SscottrobertsonAug 18, 2025
If the Maquet Heater displays the message “TEMP >= 40°C” and you can't acknowledge it with the “Alarm Off” key, it could be due to several reasons. First, the water tank might be empty, so refill it with water. Second, there might be insufficient heat dissipation; avoid operating the unit continuously for more than one hour without the tubes and oxygenator. Third, the ambient temperature could be too high; allow the unit to cool and observe the maximum ambient temperature. Finally, there could be a sensor short circuit T2, in which case you should contact customer service.