Thanks for the response Frank. I will check the thermistor type. I also sent the question to AO support and I got the following response. I wanted to post it in case it is useful for someone else. I have not yet tried what they suggested. I wanted to brush up a little on PID controllers before I did.
Sorry about these temperature issue. Yes there is a bit of a temperature offset, it’s like a set of values so that your hotend knows how much power it needs to reach specific temperatures and they are called “PID settings.” Normally our printers are shipped with accurate PID settings, but if it is showing to be off we can adjust them.
Allow your hot end to cool to room temp. In the terminal in Cura, send the following command: M303 S230 if extruding ABS at 230. Change the number in the command to reflect the temperature at which you normally extrude. The M303 SXXX command will tune the extruder. Use M303 E-1 SXXX to tune the bed. The hot end will then heat up and finally cool, while logging the temperature. When completed, similar values will be displayed:
bias: 101 d: 101 min: 145.48 max: 154.02 Ku: 64.06 Tu: 29.67 Clasic PID Kp: 38.04 Ki: 2.35 Kd: 147.63
Enter that information into your Start Gcode in Slic3r using the following format, with your values substituted appropriately:
M301 P38.04 I2.35 D147.63 or for the heated bed: M304 P38.04 I2.35 D147.63
Enter the following command to save the PID settings to EEPROM.
Reslice your model. Your temperature fluctuations should be lessened and more consistent.
I hope that helps. If there is anything else we can do to assist in the meantime please let us know.