I had a '99 Bounder for several years with a similar issue. As I recall there was a test switch located separate, but near the Intellitech board, that allow me to go manual to test the system. Both were located above the fridge alongside the DC fuses and AC breakers. Both of these items were separate from the thermostat board located in the Kitchen/dinning area. Hope this helps, it has been awhile since I had that coach.
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'04 Newmar MADP, 1100w of solar, Rubicon toad
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