Anyone familiar with the electric heating element control thermostat? I had hot water with no issues a week ago. I left coach for 7 days and returned. Turned on 110 heat switch at 1 am, green light comes on as usual so I went to bed figuring it will be toasty warm for morning. At 4 am it was in the mid 30s I was kind of cold so I turned the furnace on ( not Aquahot)...