Suburban Water Heater Not Working on Electric
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The Short Answer: If your Suburban heats on propane but not on electric, the tank is fine and the problem is on the 120-volt side: no shore or generator power, a tripped coach breaker, the electric switch off, a tripped high-limit, or a failed element or thermostat. The most common trigger is turning the electric element on while the tank was empty, which burns the element out.
Dual-fuel basics
Suburban’s DE-series heaters (such as the SW6DE and SW10DE) have a gas burner and a separate 120-volt electric element of about 1,440 watts. Each side has its own switch and controls. The element side includes a thermostat and a high-limit switch with a manual reset that opens if the water overheats. Because the sides are separate, “gas works, electric does not” points straight at the 120-volt path.
Most likely causes
| Situation | Likely cause |
|---|---|
| Electric was switched on before the tank was refilled after winter or draining | Element burned out, high-limit tripped |
| Nothing else on 120 volts works either | No shore or generator power, main breaker off |
| Other outlets work, water heater does not | Coach breaker for the water heater tripped, or switch off |
| It worked, then stopped mid-trip, water was very hot first | Thermostat stuck, high-limit tripped |
| Works on a strong pedestal, not on a weak one | Low voltage at the campground |
| Electric worked last season, nothing changed | Element or thermostat failure with age |
What you can check
- Power to the coach. Confirm the pedestal breaker and your coach’s main breaker are on, or that the generator is running. Check that other 120-volt outlets work.
- The water heater breaker in the coach’s panel. Reset it once if it is tripped. If it trips again, leave it off; that suggests a shorted element or wiring.
- The electric switch. Depending on the model and the coach, it may be inside on a control panel or on the heater behind the outside door. Make sure it is on.
- The tank is full. Open a hot faucet until water runs steadily. Make sure the bypass valves are in the normal (not winterized) position. If you find the tank was empty with the switch on, leave the electric side off; the element has probably failed.
What the technician will check
An RV technician will disconnect power, then check for 120 volts at the heater, test the element for continuity and for a short to the tank, and check the thermostat and the high-limit. They will reset the high-limit only after finding why it tripped. A burned-out element is a common, inexpensive part; replacing it involves draining the tank and disconnecting the wiring. The thermostat and high-limit are also replaceable parts. None of these failures means the tank needs replacing.
If the high-limit keeps tripping on a full tank, the thermostat may be stuck closed; repeat resets risk scalding water and damage. See how to reset a Suburban water heater for what the reset is and when it is appropriate, and RV water heater not working on electric for other brands.
Frequently Asked Questions
Q: Can I run gas and electric at the same time? A: On dual-fuel Suburban models, yes. Running both speeds up recovery. The electric side still needs a full tank before it is switched on.
Q: Will a weak campground pedestal stop the element? A: Low voltage reduces the element’s output and slows heating. It rarely stops it completely. If heating is slow only at certain parks, check the pedestal voltage with a plug-in monitor.
Q: Does a burned-out element mean something else is wrong? A: Usually it means the element was powered without water around it, often right after de-winterizing. If the tank was full, the technician should also check for scale on the element and for a thermostat that is not switching off.
Manuals and supporting references
These links distinguish general safety information from model-specific documentation. A manual directory helps you locate your unit’s instructions; it does not establish that every model uses the same parts, codes, or test values.
- Suburban: service and support (opens in a new tab)Identify the appliance behind the RV badge and obtain its operating instructions.
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