You really need to actually fault find with the aid of a multimeter. Check the element with mm on ohms. Make sure resistance is ok. Then with mm on ac voltage check if power is supplied to heater. If not work your way back. Follow wire from heater to next connection. Probably the thermostat. If power is ok on one side of thermostat but not coming out the other side- replace the thermostat. If no power in then follow it back probably to the control board. Is power supplied at the wiring plug on the Board? The turbidity sensor will not stop the heating. You should also Google search for that model number wiring diagram. If you can locate one it would help. Don't go buying parts randomly in the hope that you strike it lucky. So many people waste their money doing that and may as well of paid for a service person in the first place.
Lincoln Appliance NZ, June 2017