Extruder won't heat up. Immediate failure.

When I start up extruder I get the error below almost immediately. Nothing alarming happened on the last print other than it failed to heat properly and ended the print. Mind you I have never had a successful print on this machine yet so it seems that there is a setting that needs tweaking somewhere that I know nothing about. If anyone can provide some guidance that'd be great.

Error:Heating failed, system stopped! Heater_ID: 0
Error:Printer halted. kill() called!

This is a Prusa mk2 i3 build btw. I don't know much about all of this so if you need more info to help please let me know.

Thanks

Check your thermister on the hot end, and the connection to the board.