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"Zy-8068" sewing machine instructions"Zy-8068" user guide PDF"Model ZY-8068" manual download| Problem | Possible Cause | Solution | | :--- | :--- | :--- | | Display shows "---" or "EEE" | Sensor failure or loose connection. | Check the sensor probe connection. Ensure the probe is not submerged in water beyond the waterproof limit (if applicable). Replace the sensor if damaged. | | Device powers on but load does not turn on. | Incorrect Mode setting. | Check the HC parameter. If using a heater, ensure it is set to H. If using a cooler, ensure it is set to C. | | Temperature reading is inaccurate. | Calibration needed. | Use the P parameter in the advanced menu to offset the temperature. Compare with a trusted thermometer. | | Output switches on and off too frequently. | Hysteresis is too low. | Increase the d (Hysteresis) parameter. A value of at least 1.0°C or 2.0°C is recommended. | | Screen is blank. | No power. | Check wiring of L and N terminals. Verify the power source is active. Check internal fuse if applicable (some models have a replaceable fuse). | Zy-8068 Manual Pdf
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