My refrigerator won't go into defrost mode. I have replaced the bi-metal thermostat with no luck. The evaporator freezes up solid after about 2 months and won't allow the air to flow through it to cool the fridge side. The freezer is fine. I don't have any guide for entering diagnostics. The heater ohms out fine. How can I manually defrost this unit? and What should I try next? There doesn't seem to be a defrost timer. I don't want to throw a $150 main PWB in to find out it didn't fix it.

Thanks

I think you hold the on button and water reset button for adout 3 secouds or so. then you can advance it by pressing the water reset button. I think its when you get to four or five that it goes into the defroost mode. then just keep pressing the water reset button till it back to normal run.

I tried that and it never went into diag. I unplugged and tried also within 13 seconds as suggested on another post.

There isn't any paperwork in the front or back. I looked last week and just now rechecked where you said. I'm going to pull the back lower cover off again to recheck.

Is there a control board in the back of the fridge behind the panel that covers the compressor mounted on the left side?