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To force it into defrost, there is a 3 wire (black, blue & brown) connection plug on the mother board on the back of the unit.
Unplug the fridge, unplug the connection from the mother board, jumper the brown & blue of the female connection, plug the fridge back in. Given a good heater and a closed defrost bi-metal, it should defrost. This unit has a glass heater that you can usually tell if it is bad just by looking at it -- blackened like a bad light bulb...
This unit also susceptible to bad connections at the heater and a bi-metal susceptible to moisture (popping open). Between the heater, the connections to the heater, and the bi-metal.
I did not find a manual but there are manuals for sale at:http://www.pcappliancerepair.com/book.shtml
Hope this helps!
Let me know if you need more assistance or if you have any questions.
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