I had a similar problem in the past. Pump motor would not activate, all you get is a click. My problem was a broken wire inside one of the solenoids mounted on the back of the pump motor. With the help of an HWH Tech, key in ACC, DW pressing on one of the manual jack down switches on the control panel, I grounded out every terminal on both solenoids til I hit the one that completed the ground circuit and the pump motor came to life. I replaced the bad solenoid and fixed the problem. The HWH trouble shooting guide, available for download from their web site, and the led's on the control panel will pretty well isolate the problem for you. In that era, the pump relay and motor relay HWH was using were prone to internal corossion problems. The Trombetta replacement is a much more reliable product.
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'07 Winnebago Journey 34H, ISB-02, MH2500
Toad - '08 Ford Taurus X
Blue Ox, Aventa
US Gear UBS
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