The heat will be coming from the transformer and probably from the heatsinks used to cool the microchip. Had this problem on the Autopilot, and it was fixed by adding a fan internally.
If you can find the amps used to supply the transformer, this will give you an idea of the heat being generated. On the PoolPilot it eaquates to a 200 watt bulb inside the control unit.
Hope this helps.
Pat
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