I have worked as a appliance repair tech before and am now doing HVAC. I normally post in the Technical forum.
I have a Hotpoint refrigerator that I've owned for a few yrs. now.
Once before the defrost quit working. I checked for a defrost timer and found this unit is controlled by a circuit board in the back. Didn't know how to send it into defrost to check the operation. But was able to determine the heater was bad. I replaced the heater and defrost thermostat.That worked fine a couple of yrs. ago.
Now my rerigerator is not defrosting again. Probably the same problem. I will check the heater again once I melt all of the ice.
Any suggestions on how to send it into defrost to check voltage at the heater?