Omron SYSMAC C200H-TC Operation Manual page 72

Error Detection
Temperature Control Not
Performed
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The connecting cable is disconnected.
The connecting cable is broken.
A circuit in the Data Setting Console is defective.
A circuit in the Temperature Control Unit is defective.
After determining the cause of the error, correct the problem or replace the Unit.
Temperature control will not be performed in either one of the following cases.
SW203-5 on the rear panel is set to ON and the CPU Unit is in PROGRAM
mode.
The Stop Bit (word n+2, bit 06 for loop 1 and bit 04 for loop 2) is ON.
Change to proper settings.
Section 5