Please visit this link and to download the user manual and follow the steps.
Firstly, you have to make sure the using coils are a temp-sensing material such as Stainless steel, Titanium, Ni200, NiFe or at least has one of these material within the coils. Secondly, if it is not the coils issue, please contact us for an examination.
You can download it at Evolv's official website https://www.evolvapor.com/