What is the best way to overheat the miner to check if it will shut down at 80C?
Blocking or unplugging the fan in my mind, could be voiding a warranty. My test was to simply disconnect my internet - which is a real life occurrence (failed internet service). It might take a few minutes for the current information to finish its hashing and start beeping, but it will.
Why would no internet connection cause it to overheat?
Oops... I made an assumption, that the way my S5's and Opentoe's are working, that will do it. When there is no internet, there is no new information coming in to the miner to hash. What at least the 2 of us have seen, is when it's not hashing, it heats up. I would try that first, so that if you have any hardware failure from overheating, no internet access is a regular problem that should be planned for (the other options mentioned, are not normal operating conditions expected for the miners - just my opinion).
