Keep bugging the support, if you're lucky, they might provide an useful answer.
Do you have the app installed for this device on your mobile phone? Does it provide better info about the issue that you're facing?
After a minute you say...
Does the fan work? Could be internal overheating, maybe?
Hepa filter issue? Or if any of the air quality sensors are troubled which this device might have according to the shiny website of the product?
Did your second-hand device exhibit this behavior from the start when you got it or is this new behavior?
No lucky with the support unfortunately
The phone app doesn’t find my Heatbit
Fan goes on but dies shortly and then 101 code appears
It has been working for the previous owner
Everything is clean No filter issues
I have been doing some digging about Heatbits Trio hardware and it looks like they are using a modified Antminer S9 controlled by Orange Pi Zero 3 maybe this will clarify some things for some of you perhaps this is a S9 error code or Orange Pi?