Thank you for the suggestions.

After further tinkering, we figured that we were probably running ours too 
hot (400C+), and it has some sort of thermal protection. This doesn't 
explain the behavior I described, though ("actual temp" display/"element on" 
indicator not changing despite the heating element cooling down).

Anyway, it works just fine at 300C+, which should be plenty for our 
application. It looks like we just need a different nozzle to desolder the 
ICs.

Vitaliy 

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