I have been troubleshooting our ender 6 for the last week or so. Last week we had a clogged hot end. I replaced that with little issue and had a 2 fantastic 18 hr plus prints after doing so. I set a larger (over 30 hr) print to do over the weekend. I came back in to it frozen right after the raft layer with a heating failure. The bed heated up just fine but the hot end would not heat up at all. One of the screws from the heating cartridge had somehow fallen off also. I fixed the cartridge and unplugged the heat wire and plugged it back in. The hot end finally did heat up and I was able to run a benchy, which came out fine. I tried to run another larger print last night and had the same heating error. After closer inspection this morning it looks like there is some fraying on the heating wire. Would this be the issue, and a simple replacement is all we need? After unplugging and replugging the wire it heats up again.
Thanks in advance. I tried to give as much context as possible to see if I messed something up in the process.