Short answer is: It fails because of bad design. Is it worth it to replace with a new one or used? NO.
Long answer is: Nissan LEAF made between 2011-2013 used Eberspächer High-Voltage PTC heater, which is fitted under the 12V battery. As you probably already found out, this is most unreliable heater ever used by Nissan. Some of them failed in first few years of usage, some managed to survive till this day. But don't get excited if yours is still working. It will fail sooner or later. Why? Because of faulty design. First lets have a look why they fail ...
When I first got Leaf and bought a Type 2 to Type 1 extension cable, I have been surprised when nothing happened after connecting it to tethered charging station. Only after a bit of research I figured out why it's not charging and what's the reasons of making different connectors. I though it was only me who didn't know about the differences. But after seeing hundred times of same question asked "why its not charging?" in different places and helping to answer some of them again and again, I decided to make a post about it and share the link next time same question will be asked ...
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