Could be an input error:
If it's a 2-wire RTD a jumper between terminals 3-4. If it's a 3-wire RTD the 2 wires of the same color go between terminals 3-4. The lone color wire goes on terminal 1. Check resistance of RTD.
What kind of output is it? 4-20MA, AC Triac, etc. Only a current output can detect an open loop. Above response is valid if using PID mode. Has no effect if in Ramp/Soak mode.
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