D.S.I. fault light
On my switch panel, my D.S.I. fault light comes on (red light) when I turn on the electrical heater. I only have the RV hooked up to 110 volt power. The water heater does work electrically. It only comes on when the hot water heater is turned on. I think I remember it coming on also hooked up to 30 amp service but not sure. It may have done this since new but do not remember. Is this normal? If not, where do I begin troubleshooting. I have a Flagstaff ultra light 5th wheel.
Edited to add: I did have the switch panel off and replaced the water pump switch. The light was not working on the switch. I am positive all wires were put back as before.
Flagstaff 8528 ckss fiver
2008 Ford f350 dually 4x4 desiel