Second on electrical problem
Parked, parking brake on, motor running. Level coach. Have your significant other on the telephone, looking at the panel on the HWH control box (it is probably next to the HWH pump). It has lots of bright LEDs on it. Press the extend button. A LED or two should light up on the control box. The pump should run. Press the retract . Another LED or two should light up and the pump should run again. If it does, and the slide isn't moving, then the problem is in the HWH system. If the LEDs don't change, then the problem might be in the wiring from the switch to the Control Box. The HWH web site has pretty good documentation about which LED on their control board functions with which valve, which may help your troubleshooting.
Jim and Valerie, 2005 Winnie Adventurer 37B, 2014 Subaru Forester Toad, hitches, brakes, anti-sways, autopilot, gourmet food on a Social Security budget.
"Wave as you go by."