If your RV water heater is not working on electric but works on propane, you’re dealing with one of the most common RV water heater problems. The electric side of an RV water heater is a separate system with its own switch, breaker, and heating element, so a failure on electric mode doesn’t necessarily mean the water heater itself is bad.
This guide explains why an RV water heater won’t heat on electric, what symptoms to look for, and what you can safely check before calling a professional.
Safety Notice: This article is provided for informational purposes only. RV systems may include electrical, propane, plumbing, and mechanical components that can pose serious safety risks. Always follow manufacturer guidelines and proper safety procedures. When in doubt, seek assistance from a qualified RV technician.
Common Symptoms of This Problem
You may be experiencing this issue if:
- Hot water works on propane but not on electric
- Water stays lukewarm or cold on electric mode
- The electric water heater breaker trips
- No error codes are displayed
- Everything else in the RV has power
These symptoms usually point to a power supply issue or a failed heating element.
How RV Water Heaters Work on Electric
On electric mode, an RV water heater uses a 120-volt heating element controlled by a thermostat and protected by a breaker and internal safety switches.
The basic flow is:
Shore power → breaker → water heater switch → heating element → thermostat → hot water
If power is interrupted anywhere along this path, the electric heating mode will not work.
1. Electric Water Heater Switch Is Turned Off (Very Common)
Most RV water heaters have two switches
- One inside the RV
- One on the water heater itself (outside behind the access panel)
If either switch is OFF, electric mode will not work.
What to check:
- Inside control panel switch
- Exterior water heater switch
- Labels such as “Electric” or “120V”
This is one of the most common causes after service or storage.
2. Tripped Breaker Supplying the Water Heater
The electric heating element requires a dedicated breaker.
Check:
- The RV’s AC breaker panel
- A breaker labeled “Water Heater” or “Appliances”
- Reset the breaker fully OFF, then back ON
If the breaker trips repeatedly, stop troubleshooting and investigate further.
3. Burned-Out Electric Heating Element
Heating elements can fail over time, especially if they are powered on without water in the tank.
Signs of a failed element:
- Breaker does not trip, but water never heats
- Propane mode still works normally
- No visible damage outside
Dry-firing the element is one of the fastest ways to destroy it.
4. Water Heater Is Not Full of Water
The electric element will not heat properly if the tank is empty or partially full.
This often happens:
- After winterization
- After draining the tank
- When bypass valves are set incorrectly
Check by:
- Opening a hot water faucet
- Waiting for a steady stream (not air)
- Confirming bypass valves are set to “normal use”
Never turn on electric mode unless the tank is full.
5. Tripped High-Temperature Reset Switch
Most RV water heaters include a manual reset safety switch.
What to do:
- Turn off power to the RV
- Remove the exterior water heater access panel
- Locate the reset button near the thermostat
- Press firmly to reset
If this switch trips repeatedly, there may be an underlying problem.
6. Faulty Thermostat or Control Board
If power reaches the water heater but the element never turns on, the thermostat or control board may be faulty.
Symptoms include:
- No breaker trips
- No heat on electric
- Normal operation on propane
These components usually require replacement rather than repair.
7. GFCI or Outlet Feeding the Water Heater Has Tripped
Some RVs route water heater power through a GFCI outlet.
Check:
- Bathroom GFCI outlet
- Kitchen GFCI outlet
- Exterior GFCI outlet
A tripped GFCI can silently cut power to the heater.
When to Stop Troubleshooting and Call a Professional
Contact an RV technician if:
- Breakers trip repeatedly
- Wiring appears burned or damaged
- You suspect a control board failure
- You’re unsure how to safely test components
Electric water heater components operate at household voltage and should be treated carefully.
How to Prevent Electric Water Heater Problems
- Never turn on electric mode with an empty tank
- Verify bypass valves after winterization
- Reset breakers gently, not repeatedly
- Inspect wiring during annual maintenance
- Use propane mode if unsure
If your RV water heater is not working on electric, the most common causes are a turned-off switch, tripped breaker, burned-out heating element, or an empty tank. By checking these items in order, you can often identify the issue quickly and restore hot water without unnecessary repairs.
Related articles you may find helpful:
Hot Water Heater Doesn’t Work on Propane
Written by Dan Harvickson, RV troubleshooting specialist