First time camping with a water heater I have 2008 jayco w4 ft turned on gas for hot water it heated just fine but later the water was cold does it turn itself on to heat water or do I have to turn it off and turn on for it to heat up again
Check for the DSI light by the switch if its lit, reset your switch.
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If it's DSI and your heating with gas, you need to leave the switch on until your ready to turn it off. Should cycle on and off to keep your water hot. If it's not, check fuel, brush the igniter/fuel jet tubes and make sure it dry.