Perhaps there is some confusion RE: the switch being “off vs on” & the red light being “lit vs unlit”? My water heater is propane only so what I’m saying here may not apply but when I put the water heater switch in the on position (after ensuring that the tank is full), the red light in the switch illuminates. Once the water in the tank reaches its preset temp, the light goes off even though the switch is still in the “on” position. The water heater does periodically cycle “on” when the temp drops out of the preset range AND the red light is lit when the burner is active.
I’d consult the (I’m guessing Suburban) User Guide for the dual mode WH specifics. I would think that when the electric mode is off, the WH would function the same as the propane only models. When the electric mode is on, the propane mode should be disabled and the switch by the sink would control whichever mode the WH was in. I can’t really imagine why anyone would bypass the switch! But stranger things are done.
If you're not livin' on the edge, you're takin' up too much space!
2007 Shadow Cruiser x210, 2004 RAM 2500 4x4 QuadCab SLT 5.9L CTD, Factory Tow Pkg (3.73 axle), HaulMaster WDH