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Reasons:
1. The fuse of the electric loop is burn out or break;
2. Thermocouple break or wire is broken;
3. The thermocouple style and the interior transmitter don’t match;
4. The use range of thermocouple hasn't been settled.

Solutions:
1. Change fuse and examine the loop;
2. Change the thermocouple;
3. Set the type of the thermocouple as to the reference instructions;
4. Reset the parameter of the temperature controller.