How do you reset a water heater when it stops working?

To reset a water heater that stopped working, restore safe power and use the unit’s built‑in reset based on whether it’s electric, gas, or tankless. Most shutdowns are caused by a tripped breaker, a high‑limit safety switch, or a gas control lockout after the burner failed to light. If the reset trips again, it’s flagging an underlying issue like a bad thermostat, failed heating element, or sediment overheating the tank; that needs diagnosis, not repeated resets. We routinely help homeowners across the Phoenix Valley, including Tempe.

Try these basic resets by type:

• Electric: Turn the breaker OFF/ON, then press the red “reset” button behind the upper access panel if accessible.
• Gas: Turn the gas control to OFF, wait 5 minutes, then follow the lighting instructions to relight or power-cycle the control to ON.
• Tankless: Power the unit OFF/ON at the switch and breaker, or use the control menu’s reset if provided.

If you smell gas, see scorch marks, or water is leaking, stop and call a licensed pro immediately.

Updated: 2026-11-12

Need help in Tempe, AZ? Call (602) 899-0899 or book online. “We were so pleased with how fast Deer Valley Plumbing & Air Conditioning was able to get out and replace our old hot water heater.” — Lynda M.