Question: During use, the temperature in the packaging machine is not rising. How can this be resolved?

Answer: First, check if the fuse is faulty. Then, check if the relay is faulty. You can use a multimeter to test this, or you can use a voltage tester as an alternative. If everything is fine with the fuse and relay, check if the heating rod wire is loose or detached. If everything is secure, measure the resistance of the heating rod wire. If the resistance is too high, it means the heating rod is damaged.

Another possibility is a faulty thermocouple. This issue is easy to identify. Either the temperature controller will display a "1" on the left side, or the temperature readings will continuously fluctuate significantly. Simply replacing the thermocouple should resolve the issue.