1REPLACES PART NUMBERS: WR51X10055 defrost heater replaces part numbers are WR51X10030 AP3183311 PS303781 WR51X10030. WR55X10025 temperature sensor replaces part numbers are 914093 AP3185407 WR50X10027, WR50X10034 WR50X10055 WR50X10067 WR55X1002 WR50X10068 defrost thermostat replaces part numbers are PS1017716 1170024 AP3884317 WR50X10015 WR50X10017 WR50X10018 WR50X10028 WR50X10051 WR50X10052 WR50X10053 WR50X10054 WR50X10068. 2PACKAGE INCLUDES: 1pc refrigerator defrost heater WR51X10055, 1pc refrigerator temperature sensor WR55X10025, 1pc refrigerator defrost thermostat WR50X10068, complete set of refrigerator defrost replacements. 3FUNCTION: No need to worry about food becoming not fresh, WR51X10055 this part can melt ice and frost around the coil to keep food better. WR55X10025 the aim of sensor is to send the present temperature reading towards the control board. WR50X10068 this part would shut off and cut off the defrost's electricity when the temperature reached a degree. 4DURABLE: To ensure your safety and health, the refrigerator replacement parts are made of durable aluminum alloy materials, ensuring long service life. 5FIX SYMPTOMS: Fridge too warm. Freezer not defrosting. Freezer section too warm. Frost buildup. Please cut off the power supply before installation.