reverse engineer New Model Fan-tastic fan rain sensor?

My old 3-speed, temperature sensing, rain sensing fantastic fan was so great I bought the exact replacement model. The problem is they redesigned the rain sensor. The old model closed with moisture and opened when the sensor dried. In practical terms this meant a light sprinkle might close the fan for 10 minutes, a heavy rain for an hour, at which point the fan opens and if it's still raining it closes again.

Pretty brilliant and my absolute favorite feature of the fan, since it's our only cooling source.

The new fan looks the same except when the slightest bit of moisture gets on the rain sensor it just closes forever. 11pm, 3am, the fan doesn't come on again until you get up and flip the switch (I purposefully and intentionally avoided the remote control).

I emailed fan-tastic about the problem and they basically said "we changed the design".

So now I'm stuck with a brand new, freshly mounted fan-tastic vent that I need to reverse engineer to be like the old one. The worst part is I gave my old fan away because someone with a base model wanted to upgrade the sensors etc.

So- does anyone know how to reverse this design flaw and have it reopen automatically after the sensor dries?

Is there wiring I can change or a component to swap? Which part of the fan controls this behavior? I know I can swap parts with an older model (if I can find one) I just need to know which part/parts to look for.

Obviously if I can soldier, jump or wire something differently that would be easier.

Please let me know any ideas on un-fixing this vent fan!