display cooler display cooler display cooler power plug > remove the freezer air duct grating > and find the arc under the evaporator The defrost heater under the aluminum plate is > the two hooks of the fixed heater are opened at an angle, and the defrost heater is taken out. Some models can take out the defrost heater without the fixed hook. Installation is the reverse process of disassembly. [Note] During the process of disassembling the defrosting heater, the round aluminum plate must not be damaged, otherwise the defrosting water will drip onto the defrosting heater, damaging the defrosting heater, and even burn out the inner tank of the display cooler display cooler has been used for two or three days to cool normally, and then the cooling effect will decrease. Find the two wiring plugs of the defrost heater and unplug it. You don't need to remove the defrost heater wire, and directly measure the resistance of the two plugs. The normal value should be 320Q-500Q. Infinity is an open circuit. For on-site maintenance without a multimeter, you can only remove the defrosting heating wire to observe the internal metal wire. If the inside is white or broken, it means it is damaged.