FWIW ... my '03 has small relays and fuses on the panel in front of the PS chair. The relays enable the HWH control panel based upon ignition key being in "Accessory" or "Run" position. Yours might be different but IIWMI'd check that panel before replacing the board.
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Bob Bowers (Surprise, AZ)
2003 Alpine Coach 40' FDTS
2014 Jeep Cherokee Lattitude
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