Atwood Electric Water Heater Not Working

The Short Answer: An Atwood (now Dometic) RV water heater on electric needs 120V shore power or a generator, a full tank, the bypass valves in winterize-off, and a reset ECO. If it was fired empty, the high-limit is open. Reset once. If it trips again or you have no 120V at the element, stop and hire an RV tech or licensed electrician.

Search Intent & The Real Problem

You are on shore power. The switch is on. The tank is silent. Gas may still work, which fools people into thinking the whole heater is fine. Electric and gas are separate circuits on these 6- and 10-gallon boxes. Electric is a 120-volt element (typically ~1400 W) behind a thermal cutoff. The usual killers: winterization (empty tank + switch on), bypass valves left in bypass, a popped ECO, or a park pedestal that is only putting out 105 volts.

What other guides get wrong

Generic troubleshooting pages often jump to a part or a reset before identifying the unit, fuel, and failure sequence. Start with the model label and the safest outside checks. If the fault involves gas, combustion, pressure, or 240 volts, stop at that boundary and call a licensed professional.

Step-by-Step Troubleshooting

Step 1: Confirm the tank is full and not in bypass

• What to look for: Bypass valves (usually three valves near the heater) in the “normal” path so city/pump water actually fills the tank. A dry tank after winterizing. Water at the hot tap that goes cold in seconds (you are seeing the residual in the lines, not tank water).
• Required tools: Flashlight, the plumbing diagram in the cabinet.

Open a hot faucet until you get a steady stream with no sputtering before you ever hit the electric switch.

Step 2: Prove 120V actually reached the heater

• What to look for: Other 120V appliances alive, GFCI in the bathroom/kitchen tripped, converter/inverter not passing through, generator not running. The inside switch illuminated but the park pedestal breaker tripped.
• Required tools: Receptacle tester at a nearby outlet, then — only if you are qualified — voltage at the heater’s 120V board with the cover off and power on is a tech step.

No 120V at the coach is not an Atwood problem.

Step 3: ECO / high-limit reset

• What to look for: Red or black reset button on the back of the thermostat/ECO, often behind the exterior door. A heater that was switched on with no water, or after a dry camp, almost always has this open.
• Required tools: Finger, cold tank, power off then on.

Reset once. If it clicks off again within minutes, the thermostat is welded, the element is grounded, or you still have no water. Do not hold the button in.

Step 4: Element and thermostat

• What to look for: No heat with 120V present and ECO set. Element open (infinite ohms) or shorted to ground (any continuity from a screw to the tank). Thermostat not closing.
• Required tools: Multimeter, power verified dead, element wrench.

Replacing an element in an RV tank is straightforward if you can drain it. Replacing a heat-damaged board or a melted wire nut is a licensed/RV-tech job.

Step 5: Switch, board, and the gas side red herring

• What to look for: Interior switch failed, analog board on older Atwoods with a blown fuse, or a dual-fuel unit where someone diagnosed “bad heater” because gas was also in lockout (separate DSI issue).
• Required tools: Manual for SW6DE / SW10DE / GE6 / similar Dometic numbers.

If gas works and electric does not, stay on the 120V path. Do not start replacing the gas valve.

When DIY Ends: Calling a Licensed Pro

Stop if the ECO will not latch, you smell burnt insulation, the park pedestal trips when the element kicks in, or the tank is leaking at the element threads into the cabinet. 120-volt work on a wet RV is not a YouTube element swap if the wiring is brittle. A mobile RV tech or a licensed electrician will load-test the pedestal, megger the element, and replace the ECO/thermostat as a pair when the tank was dry-fired.

Frequently Asked Questions

Q: Why is my Atwood water heater not working on electric but gas is fine? A: They are independent. Electric needs 120V, a full tank, bypass off, and a closed ECO. Gas working proves the tank can hold water — nothing else.

Q: Where is the reset button on an Atwood RV water heater? A: On the thermostat/ECO behind the exterior access door, on the tank jacket. Power off, tank full, press once. If it pops again, stop.

Q: Can I run the Atwood electric element on a 30-amp pedestal? A: Yes if the pedestal and cord are healthy — ~12 amps at 1400 W. If the pedestal is weak or shared, the element brown-outs and the ECO can nuisance-trip. Have the pedestal tested.