Detailed instructions on how to troubleshoot temperature errors on Haitian injection molding machines.
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Troubleshooting on the screen: If the actual temperature is lower than the set temperature but the system still shows that it is heating (the percentage of power is displayed), it indicates a problem with the control system or heating components.
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Motherboard Inspection: The technician will guide you through checking the TR1 signal pin on the motherboard to see if it’s receiving 24V. If the board is faulty, the video will show you how to reset the software to switch to a redundant pin (e.g., from section 1 to section 6) and change the actual signal wire connections on the board.
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Check the Solid State Relay (SSR): Measure the 24V input control voltage and the 220V output AC voltage from the SSR. If there is input voltage but no output voltage, the SSR is faulty and needs replacing.
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Check the heating ring and sensor wire: The final step is to check the resistance of the heating ring and the tightness of the temperature probe wire. In the specific case of the video, the fault was identified as a loose temperature probe wire (section 1) . After securing it, the temperature stabilized.