What is the reason the shrinking machine heats up slowly or cannot rise to a higher temperature (above 160 ℃)?

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