RV Mobile Medics Repair & Service

You turn on your RV water heater and have plenty of hot water when it’s running on propane. Switch over to electric and…nothing.

Or maybe yours is doing exactly the opposite.

When an RV water heater works on one heat source but not the other, that difference can provide an important clue about what’s going on.

Gas and Electric Modes Don’t Work Exactly the Same Way

Many RV water heaters are designed to heat water using either propane or 120-volt electricity. Although both modes heat the same tank of water, they don’t use all of the same components to do it.

The electric mode uses an electric heating element, while propane operation relies on a burner and ignition system. Depending on the water heater, the two modes can also share certain controls and safety components.

That’s why it’s possible for one mode to continue working normally when there’s a problem affecting the other.

It Works on Propane but Not Electric

If you’re getting hot water on propane but nothing happens when you switch to electric, the fact that the propane side still works helps narrow down where the problem may be.

The issue could involve the electric heating element, electrical power to the water heater, a relay, wiring or another component involved in controlling the electric mode.

It doesn’t automatically mean the heating element is bad.

Proper testing is the best way to determine where power is being lost and which component is actually causing the problem before parts are replaced.

It Works on Electric but Not Propane

If the electric mode heats the water normally but the propane mode doesn’t, the problem may involve the propane supply, ignition system, burner assembly, gas valve or one of the controls or safety components that allows the propane side to operate.

You may notice that the burner tries to ignite but doesn’t stay lit, or the water heater may go into a fault or lockout condition.

Again, the symptom gives you a starting point, but it doesn’t necessarily tell you which part has failed.

What If Neither Mode Works?

When neither propane nor electric operation produces hot water, the problem may involve something used by both modes rather than two separate failures.

Depending on the make and model, that could include the water heater’s power supply, controls, thermostat or safety circuitry.

This is another reason diagnosing the system before replacing parts matters. It’s also where DIY troubleshooting can get expensive. It’s easy to assume a certain part has failed based on the symptoms, replace it, and discover that wasn’t the problem at all. Proper testing by an experienced RV technician can pinpoint the actual cause before you start spending money on parts you may not need.

A Working Propane Side Doesn’t Mean the Whole Water Heater Is Fine

It’s easy to assume that if the water heater works on propane, the water heater itself must be okay and the electric side just needs a new element.

Sometimes the problem may be fairly straightforward. Other times, the component preventing electric operation isn’t the heating element at all.

The same applies when electric operation works but propane doesn’t.

Knowing which mode works and which one doesn’t is useful information when troubleshooting begins, but testing is what determines what’s actually wrong.

If your RV water heater has stopped working on propane, electric or both, RV Mobile Medics Repair & Service can diagnose the problem and determine what needs to be repaired.

Mobile RV service is available throughout Fort Worth and surrounding areas.