Replaced silicone cover on hotend. now the temp reads -14 degrees on info screen and 0 degrees on Cura screen for nozzle. attempts to preheat result in Min Temp error.
Hello @Punimals …! 
Welcome to the Creality Forum…! 
On some of the hot ends there are very delicate wires for the thermistor which measures and controls the temp for the hot end. Check to see if they are in place and not broken…
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