Reset an electric water heater
The shower runs cold, you check the breaker, and it hasn't tripped. On an electric water heater, the next suspect is a red reset button hidden behind a small panel on the side of the tank. It's a safety cutoff, and pressing it often brings the hot water back within the hour.
What's actually going on
Electric water heaters have a high-limit switch that cuts power to the heating elements if the water gets too hot. When it trips, the heater goes silent until someone presses the reset. It usually sits behind the upper access panel, tucked under insulation, just above the upper thermostat.
A single trip can happen after a power surge or a very long hot shower. If it keeps tripping, the button is telling you something else is wrong, usually a failing thermostat or heating element.
Why it happens
Storms and brief outages can trip the high-limit switch. One reset and it's fine.
A thermostat that sticks on keeps heating past the safe limit, and the reset trips to stop it.
A damaged element can overheat the water even with the thermostat off.
A loose connection at the thermostat heats up and can trip the switch. You may see discolored wire ends.
| What happens | What it means |
|---|---|
| Click, and hot water within an hour | It was a one-off trip. You're done. |
| No click | It wasn't tripped. Check the breaker and any wall disconnect switch. |
| It trips again within days | A thermostat, element or wiring fault. Call a plumber or electrician. |
| Hot water, but only a little | The lower element may have failed. |
Reset it safely
- Turn off the powerSwitch off the water heater's breaker. It's usually a double breaker marked water heater or WH. This heater runs on 240 volts, so this step isn't optional.
- Open the upper panelUnscrew the small metal cover on the side of the tank, near the top. Fold the insulation back gently. Don't pull it out.
- Test for powerHold a non-contact voltage tester near the wires and the thermostat. It should stay silent. If it beeps, the wrong breaker is off.
- Press the red buttonPress the red reset button above the thermostat firmly until you feel or hear a click. If there's no click, it wasn't tripped.
- Close up and waitPut the insulation back, screw the cover on, and turn the breaker back on. Give it 30 to 60 minutes to heat a full tank.
Still not fixed?
No click and still no hot water? Go back to the breaker, and check for a separate disconnect switch on the wall near the heater.
Gas water heater? There's no reset button. Check the pilot light instead, following the lighting steps printed on the tank.
What a pro charges: A plumber or electrician typically charges $150–$400 to replace a water heater thermostat or heating element, parts included.
Common questions
Where is the reset button on an electric water heater?
Behind the upper access panel on the side of the tank, under the insulation, just above the upper thermostat. It's usually red.
Why does my water heater keep tripping the reset?
A thermostat stuck on, a shorted element, or a loose wire. Repeated trips need a repair, not more resets.
Do gas water heaters have a reset button?
Not like electric ones. Some have a reset on the gas control, but most problems come down to the pilot light.
Is it safe to reset a water heater myself?
Yes, if you turn off the breaker first, test for power, and only press the button. Don't touch the wires, terminals or elements.