How to switch from propane to electric for heating water & inside of 2016 North Trail 26LRSS Caliber. Want propane for only gas stove top & oven. Steps taken: filled water heater tank 1st, hooked up electricity, inside rv toggled KIB DSI / FLT Water Heater Electric switch on (lights up), inside rv on Coleman Mack thermostat moved temperature know to 75 degrres, System know to Heat & Auto High, checked WFCO Converter with Distribution Panel Model WF-8955PEC 129 15 AMP A/C & Furnance, & outside rv did not see on ATWOOD Automatic Water Storage Model GCAA-19E Gas/Electric Drawing & Connections for a switch, pin or reset button to switch from propane to electric. Should manufacturer have set this. Is it on the back side of three Atwood? Can I do this & not void warranty? Thanks.