After I got done printing something, I turned off my printer. I turned it back on and when I went to print something else, I got a A.B temp error. I restarted my printer and then it read -15 Celsius. I turned it on again a few hours later and I set it to preheat pla. It went up to 60 Celsius and then after a few minutes popped up with the same error message. Someone please help 