Sanyo side by side door fridge is not defrosting, what to do?

Bonjour,
Trouble comes in 3's
If there is never any water in the drip pan under the refrigerator it is not defrosting and the evaporator drain line may be stopped up. Side by Side refrigerators cool the freezer first and send a small amount of cold air to the refrigerator side. To start defrost the defrost timer stops the compressor and all fans. Next it turns on the defrost heater. This melts the ice/frost off the freezer coils. The water drips down the drain line to the drain pan under the unit. If the defrost heater raises the temperature too high the defrost termination thermostat turns the heaters off. When the defrost timer finishes it turns off the heaters and turns the compressor and fans back on. If the drain line clogs with food the water does not drain out and when the compressor starts again the water freezes. If this keeps happening the ice gets higher and bigger until it clogs the coils and the freezer does not get cold. If the defrost termination thermostat turns off the defrost heaters too soon all the frost is not melted from the coils. And the coils soon clog and the freezer gets too warm. No defrost usually means either a bad defrost timer, a clogged drain line, a bad defrost termination thermostat or some combination of the three.
If the drain line is not stopped up you can try this.
Remove all food from freezer and refrigerator, open the doors and unplug the cord. Wait 30 hours for all the frost to melt.
Keep the doors open and the cord unplugged the whole time. Empty the drain pan to keep it from over flowing. After 30 hours plug it back in and wait for 1/2 cup of water to turn to ice in the freezer. Then you can put the food back in. The problem can return if the unit is not defrosting. Or you can call a service technician.