Check the following line in your Configuration.h and see what it's set at:
#define HEATER_0_MAXTEMP 275
275 looks to be the default but it's possible that's set lower for your firmware, especially if it was preconfigured by someone for you. It's also possible that 230 is the limit of your thermistor and beyond that it goes to a state that your electronics doesn't understand. What is the specific error you are seeing?
#define HEATER_0_MAXTEMP 275
275 looks to be the default but it's possible that's set lower for your firmware, especially if it was preconfigured by someone for you. It's also possible that 230 is the limit of your thermistor and beyond that it goes to a state that your electronics doesn't understand. What is the specific error you are seeing?