: The LED display is highly visible for real-time monitoring of both measured and set values.
| Problem | Possible Cause | Fix | |---------|---------------|-----| | No display | No power | Check supply voltage | | Temp not stable | Wrong PID values | Run auto-tune | | Output always on | Relay stuck / wrong mode | Check control mode (PID vs ON/OFF) | | Wrong reading | Wrong input type | Set InP parameter correctly | xmtd-2201 manual