What is the reason for the slow or inability of the shrinking machine to rise to a higher temperature (above 160 degrees Celsius)?

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The circuit of the heater is that the main power line passes through a magnetic switch and then to the electric heating tube, so it is necessary to first check whether the contacts of the magnetic switch are normal. If the line does not pass through one of the phases, the above phenomenon will occur. If the magnetic switch is normal, you can check the electricity meter again to see if the ohmic values of each phase are the same as those of the machine. If normal, it should be a short circuit. If all phases are connected but the circuit or heating tube is still abnormal, the heater needs to be replaced.