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Old 01-17-13, 02:38 AM   #7
BradC
Apprentice EcoRenovator
 
Join Date: Dec 2010
Location: Western Australia
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Here's your users manual as a start.

http://products.geappliances.com/Mar...=981130016.PDF

That PCB looks like it is just a switch mode power supply and some logic. The board has a pair of opto-isolators on it. Follow the wires from the 4 terminals that connect to the indoor unit and see if two of them connect to the optos (IC9 & IC10) at the bottom left of the board.

My theory is two of those wires supply power to the indoor unit, and the other two signal back. I'd expect something dumb like (A)Compressor & (B) Reversing valve.
I'd have thought the indoor unit has no requirement for any fancy comms to the outdoor unit. The outdoor unit may have some thermistors and other control gadgetry that assist in managing defrost & condenser fan speed.

Have you got access to high resolution scanner? Some scans, or even high res photos of the back of the board, and some labelling to tell us which wires go to what devices from the plugs on the front might help us figure it out.
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