I have a whale 8 liter heater in my 2015 Elddis 304 that's not heating water on gas or electricity .Ive checked the trip switch and fuses and for power at the board there is gas going to the other appliances. The led on the switch board is flashing 5 times I rang whale who were very helpful and suggested switching it on and off to reset it . but it is still not working . Would the temperature sensor stop the unit from heating on gas and electric ?