On my classic TAZ Pro, I recently received a E1 Error (Thermistor problem). I restarted the print and received yet another E1 Error about an hour later. Strange since it worked just fine for about half of the first print and then again on the second print until the error reoccurred.
Upon removing the dual printhead I discovered that the Thermistor wires entering the probe head had the white insulation material partially missing and cracked. Perhaps I wondered, that while the printhead moved about, those wires might arc and thus provide the E1 error. I needed a high temperature glue. I found that J-B Weld Epoxy had a reported high temperature of 550F (288C) after curing for 24 hours. After mixing the epoxy, I used a pin to insert it in and between the wires. I waited 48 hours to insure it was completely cured.
Upon startup, I slowly increased the temperature settings at 10-degree intervals starting at 180C. The only outward physical sign was that of some smoke once I was beyond 200 C, which quickly dissipated. I restarted my original print, and it is working great! No need to replace the Thermistor though I have one in my parts box…
You don’t always have to replace parts as sometimes you can indeed fix things after thinking it over for a while!