If it's a glass heater you can look at it,if it's all black change it out,i've checked heaters that read good but it still needed to be replaced,like i said pull it out and do a visual look at it,if your machine has a timer,advance the timer by spinning the knob on the timer until you hear a click,when it clicks it's in defrost,if the heater doesn't come on check the defrost thermostat on top of the coil,depending on your machine,some have plug in connectors on the t-stat.you can unplug the thermostat and send power dirrectly to the heater bypassing the thermostat,if the heater comes on then the thermostat is bad,if you don't have the plug in connectors you can cut the wires and bypass the thermostat and see if the heater comes onyou'll have to cut them anyway and then wire nut them together if the thermostat's bad , also you can look at the thermostat,if it's bulgging on the top it's bad,also when you look at the heater,if it's black inside the glass change the heater and the thermostat together.you have to melt out all the ice off the coil before you close up the back wall,if there's a board in your machine there's a white sensor on the top coil,it looks like a bullet, i think the part number is wr55x10025,the older sensors are white but they have a black ring around them near the end of the bullet part,the new sensors are all white, it's a good idea to change that out also.let me know what you find,next time send the model number
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