Yeah absolutely degrees C. Idk why it says F must have mistyped.Degrees F. ? F? Your printer isn't really calibrated in F is it? I've never seen any that were. Are you sure you're not trying to print at 190°c ?
Because 190F probably wouldn't melt the PLA.
2nd:
Look at the gCode. Do you see the lines for it turning off the heating? Just delete them. gCode is just a text file. My favorite editor is Notepad++
Also if its a "heating runaway" error that's a little different. If it doesn't heat the nozzle fast enough, there is a safety concern that the reading is wrong and you're in a runaway state that will burn it all up, so it shuts down. Is your parts cooling fan *ON* the nozzle instead of *just below* the nozzle on the extruded plastic? You will have a hard time maintaining temp if there is a constant cooling blow on it.
I assume you ahve a silicone sock on the heat block to help retain heat.
Also check the grub screw holding the heating cartridge in place. If the cartridge has a loose fit its not transferring heat well.
I do have my silicone sock on my extruder and during printing, the tempt remains stable, so it's not having trouble maintaining temp except during the autohome. I will check that fan level but I don't think that's the issue. And I checked all my screws to no avail. I guess I will have to look at the gcode. Boo! I hate reading code - makes my head hurt.