Ok yes it should work on Gas or Electric or both
now there are indicator lights. Either in the switch or near them for Gas and Electric. Does the light for Electric come on? (if not use a test light or volt-meter.. On my RV the light did not work...because the bulb burned out.. I installed an LED indicator. that worked and was not nearly as annoying (Bright)
No if the light comes on.. Next stop is a black box on the "Back"side of the water heater(Inside the RV) it should be fed by a ROMEX cable.. got 120 VAC..NO. problem found YES.. Look for 12 volt to the relay.. Got 12 v to the relay>> Did it close (if not problem found) Follow the wires from the relay to the heat element... Good chance a resistance check will show open circuit (should be around 10 ohms give or take a couple)
Suggested if it's the element get a 1500 watt 240 volt element .. this will drop the heater's current from 12.5 amps to 3.125 and help to prevent the click of darkness on 30 amp sites.. Takes a bit longer to heat but .. not normally a problem if you need how that fast.. Add gas.
