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Gday Peter
If it was heating vs cooling, i would also swap the polarity on the TEC unit first. It might be the processor that controls it wont start the fan unless it detects it is cooling????
Andrew
Edit
Looking at the other piccies on FleaBay, it appears to be a Willhi model WH7106K
if so, Googling "willhi WH7016K controller" gets links to operating docs.
not marvellous, but it explains the basics
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