If you can get a replacement control board for $35, that's pretty much a no-brainer. Super easy to swap out: usually just a handful of screws and the thing just unplugs. Plug new board in, reassemble enough to test before reassembling everything. If it acts like it should for a few minutes, you're good to go. Unplug the unit, reassemble everything, should be good to go for a long time. While you're in there, you could add a little bit of surge protection if you want.
Rigging a control isn't too difficult, but it depends on a lot of other factors. Mainly, how much is your time worth? The re-rigged unit might not look or act the same as the original control. If the original board isn't completely fried, the brawny parts (relays, sensors, power supply, buffer chip, etc.) can be reused to a certain extent. Deciphering the original design, configuring the thing to do what you want, and debugging the rig takes time and expertise that you may not want to invest on a small appliance.
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