carl_m1968 wrote:amaterov wrote:carl_m1968 wrote:Your thermistor wires are exposed and shorted together or one or both is shorted to the heat block. A thermistor works on the principal that as its temp goes up its resistance goes down. The cpu interprets this drop in resistance as an increase in temp. If the thermistor is shorted eternally or internally then it will be near zero which the CPU would read as a temp that is off the chart and give you the over temp error.
Thank you so much for such a quick response
Just checked the resistance on the heat-end wire, seems fine. I'll be checking the thermistor right now, I remember the wires being somewhat exposed, perhaps while putting it back in and applying the silicone made them touch. I don't believe the silicone I am using is conductive. Its Permatex red RTV high temp Silicone Gasket Maker 
I think I might of exposed them while trying to remove it from the extruder.
The heater wires would cause a complete different problem. The body of heat block (that part the heater and thermistor are in) is electrically grounded. So if one of the thermistors wires is touching the body of the heat block without insulation it will appear to the CPU that there is little or no resistance and as I said the CPU will see this as the temp being way to high and give you the over temp warning which is what that code is. The wires could also be touching each other as well.
Heat block/nozzle made of brass? There's definitely wires being exposed on the thermistor, not sure if they are touching the heat block or each other however, its hard to pin point. How do you prevent them from touching anything, they are so small.
I was able to slide the insulation back on the exposed wire. Again I think during the removal of the thermistor I must of pulled the insulation back a bit and caused the wires to expose. Geez, anyone ever trying to clean these things, be vary cautious when it comes to removing the thermistor.