First start is take some good clear Macro pictures of both sides of the Circuit board & post here.

Vic41 wrote:

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Is this any good ?????  Bit hard to see though;

https://www.google.com.au/#q=fantastic+vent+wiring+diagram 

More diagrams on this link too;

https://www.google.com.au/search?q=fantastic+vent+wiring+diagram&tbm=isch&tbo=u&source=univ&sa=X&ei=IV4uU-TSA8eKkgXjyoHQAg&ved=0CDwQ7Ak&biw=1067&bih=496 

 Thanks for the reply, I have already been thru those.

 

Kevin

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03_troopy wrote:

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Can you post a closeup view of the component side of the board. Although if you are looking for a schematic of the board, it sounds like you know enough to check the most common components likely to cause a problem. With products like this, it's fairly unlikely you'll get a schematic unless someone has sat down and traced out the board.

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I'll try to get a photo up. It's got a couple of NAND Scmidt triggers 4 transistors and a voltage regulator to reduce 12v down to about 10v for the motor. There a no open/closed switches it appears to sense a rise in motor current at open/closed position to turn off. There are no relays.

Kevin