It could be an ice buildup. A bad defrost heater or thermostat most likely. Remove the ice maker and back panel and look for ice. Typical failed defrost:
If you see ice like on the left then you have either a failed timer or defrost control OR a failed heater OR a failed heater termination thermostat commonly known in the appliance repair world as a terminator. The most popilar generic terminator is the 25f close and 50f open type, In other words when the ice box is below 25f the termination thermostat is open for business and will allow the heater to commence defrost when powered up by the timer or electronic control to do so. Since the defrost duration is 21 minutes long we need to shut down the heating element to prevent damage to the ice box. So what goes wrong? Look for a failed terminator or a failed defrost heater. If both are fine then the control will be the problema. If it is defrost timer simply advancing the timer forward manually can kick it into defrost and turning it manually several turns and sometimes frees it up, if it is electronic you will have to post a model number for further assistance.
If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61
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