Just got back to Florida for winter. All works except water heater. Won't lite on lp or electric. Worked fine when we left in spring. In Sunnybrook Sunset Creek trailer. When I flip switches for either elecgtric or lp light comes on but then DSI/FLT light comes on and nothing works. Took board off and had tested at RV dealer and they said board is ok. Have scheduled service call, but any ideas of what might be wrong? Tank was flushed, and new anode put in drain hole.. I had replaced the ECO/THERM just last year. Need help soonest, before they show up to fix ($100 to just get here)