Dometic RV Water Heater Not Working on Electric Troubleshooting Guide

Discovering your Dometic RV water heater not working on electric can be a frustrating setback, especially when you’re hoping for a hot shower after a long day on the road. Many RVers rely on the convenience of electric heating to conserve propane and avoid the noise of a running generator. When the electric element fails to heat, it’s time to troubleshoot, not despair. The issue of your Dometic RV water heater not working on electric isn’t always a complex problem; often, it’s a simple fix that you can handle yourself with a bit of knowledge and patience.

Common Culprits Behind Electric Water Heater Failure

Several factors can contribute to a Dometic RV water heater refusing to heat water on electric. Let’s explore some of the most common reasons:

• Tripped Circuit Breaker: This is the most common and easiest to rectify. Check your RV’s circuit breaker panel and look for a tripped breaker labeled “Water Heater” or similar. Reset it and see if the problem resolves.
• Blown Heating Element: The electric heating element itself can burn out over time due to sediment build-up, corrosion, or simply reaching the end of its lifespan.
• Faulty Thermostat: The thermostat regulates the temperature of the water. If it malfunctions, it may not allow the heating element to activate.
• High-Temperature Cut-Off (ECO): This safety device trips when the water temperature exceeds a safe level. It’s usually a manual reset button located near the thermostat.
• Wiring Issues: Loose connections, corroded wires, or damaged wiring can interrupt the flow of electricity to the heating element.

Step-by-Step Troubleshooting

Here’s a methodical approach to diagnosing why your Dometic RV water heater isn’t working on electric:

1. Check the Circuit Breaker: As mentioned earlier, this is the first and easiest step. Ensure the breaker is properly reset.
2. Inspect the High-Temperature Cut-Off (ECO): Locate the ECO reset button (usually behind an access panel on the water heater) and press it firmly.
3. Test the Heating Element: Use a multimeter to check the resistance of the heating element. A reading of infinity (open circuit) indicates a blown element. A low reading (close to zero) can indicate a short. The correct resistance reading will vary depending on the wattage of the element (typically around 11-13 ohms for a 1440 watt element).
4. Examine the Thermostat: A faulty thermostat is harder to test without specialized equipment. However, you can visually inspect it for signs of damage or corrosion. If in doubt, replacement is often the best course of action.
5. Check Wiring Connections: Carefully inspect all wiring connections to the heating element, thermostat, and ECO for looseness, corrosion, or damage. Tighten any loose connections and clean any corroded terminals.

Replacing a Heating Element

If your testing reveals a blown heating element, replacement is necessary. Here’s a simplified overview (always consult your RV’s manual and follow all safety precautions):

1. Turn off the power and water supply to the water heater.
2. Drain the water heater completely.
3. Remove the access panel covering the heating element.
4. Disconnect the wires from the heating element.
5. Use a specialized water heater element wrench to unscrew and remove the old element.
6. Apply Teflon tape to the threads of the new heating element.
7. Screw in the new heating element and tighten it securely.
8. Reconnect the wires.
9. Replace the access panel.
10. Refill the water heater and turn the power back on.

Remember to always consult a qualified RV technician if you’re uncomfortable performing any of these tasks. Working with electricity and water can be dangerous if not done properly.

Preventative Maintenance for Your RV Water Heater

Regular maintenance can significantly extend the life of your Dometic RV water heater and prevent unexpected breakdowns:

• Drain and Flush Regularly: Drain and flush your water heater every 6 months to remove sediment build-up.
• Inspect the Anode Rod: The anode rod is a sacrificial metal rod designed to corrode instead of the water heater tank. Replace it annually or as needed.
• Use a Water Softener: Hard water can accelerate corrosion and sediment build-up. A water softener can help prolong the life of your water heater.