Thermocoupler Daughter Board Fault Light

[zerogee]

My thermocoupler connection on the daughter board is not working, and I'm getting is the 2000c error reading. In addition the "fault" light is lit on the daughter board. I could not find any documentation on the "fault" light. can someone tell me what it means. I also unconnected all wires to the daughter board turn on the main board and the daughter board fault light remains "on" with no wires connected. I reset the main board a number of time and re-seated the daughter board but the fault light on the daughter board will not go out. suggestion???

[dc42]

The fault led will illuminate if the thermocouple is not connected or it is shorted to something else.