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if there is no obvoius damage visible which can be fixed easily then I recomend to talk to your retailer

can you can check the probe plug?

the housing can be opened easily, maybe you see that a cable is not connected any more

what should this help?

if there is a hardware damage - either ProfiLux port or probe connector - it will not recover after waiting a few hours

is it plugged in correctly? means deep enough?