Melbourne 2013 29D - mystery switch

[LewLou]

We just purchased a Melbourne and went through the walk through but have an unlabeled switch in the bathroom. We think it might be an interior on/off switch for the tankless water heater.... There is a switch on the heater itself outside so not sure... when we checked at dealers they weren't sure.. they called Jayco and they said it was the tank heater, but that is in another place! So here is a picture of the panel in the bathroom... photo is sideways so the mystery switch is the one on the right....

thanks! LewLou

[Rustic Eagle]

Could it be for the water pump?

Bob

[msturtz]

Our Greyhawk has a switch like this. It controls the light in the shower.

[hknight]

I have a 2013 Melbourne 29D also and when I first tried to turn on the Exhaust Fan in bathroom it would not work. Contacted Jayco and was told that the lower switch also controls the exhaust fan. Turned it on, then turned on switch in the exhaust fan and sure enough it came on. Why two switch is beyond me. Hope this helps

[@K6GAD]

We have the exact same switch in our Greyhawk 31DS. It is labeled "tank heater".
Is there a second water heater in these units? If I flip the switch it lights up...but nothing happens...

[msturtz]

Originally Posted by @K6GAD

We have the exact same switch in our Greyhawk 31DS. It is labeled "tank heater".
Is there a second water heater in these units? If I flip the switch it lights up...but nothing happens...

That switch controls the UltraHeat tank heaters. You should not turn on the tank heaters without liquid the tanks it can cause damage. The tank heaters are intended to be used below 40F.

[JasonVideo]

It heats your grey and black tanks when the weather is cold.