Hot water switch lamp is red
My 1998 2570 model which has been virtually problem free for over 12 years now has a problem with the hot water heater. When you press the switch to turn on the heater it starts right up and runs until the water is hot, but when it shuts off the switch lights up red showing there is some sort of problem. You can turn the swith off and the light will go out which is normal, and then turn it on again and the heater will come on and run. When the water is hot the heater turns off and the red light comes on again. Any idea on where to start looking? Thanks in advance for your help.
1998 Solaris T-2570/Tow vehicle 1999 F350 PSD