It’s in overheat mode. Did you apply thermal paste? Try setting voltage and frequency to defaults, save and restart
#Bitaxe Supra hashing terribly after ICE cooler tower 'upgrade'. Not overheating, though… Could I have damaged the ASIC while installing it with those pink thermal pads?
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Discussion
Does it stay in that mode even after unplugging? Because now the BitAxe doesn't even get warm in the first place as the ASIC doesn't really 'get going'. Yes, I switched back to thermal paste for the Supra & Ultra and the Ultra is hashing nicely. Also switched the Supra to version 2.1.1 but still doesn't really start hashing.

Yeah, overheat mode sets the hash frequency and voltage to the lowest levels to prevent any more overheating. That will persist until you change it back in AxeOS.