Why does my electric water heater keep tripping the reset button?

Why Does My Electric Water Heater Keep Tripping the Reset Button?

Tired of taking freezing cold showers because your electric water heater keeps tripping the reset button? This frustrating issue is actually a built-in safety mechanism warning you of a severe electrical or temperature hazard. This blog post explains exactly why your high-limit switch keeps tripping and provides the solutions to restore your hot water safely.

What Causes the High-Limit Switch to Trip?

A failing thermostat or a shorted heating element is almost always the reason your water heater reset button trips. The reset button acts as an Energy Cut-Off (ECO) switch that instantly cuts power if the water temperature dangerously exceeds 180 degrees Fahrenheit. If a broken thermostat fails to turn off the heat, this emergency switch trips to prevent the tank from boiling over or bursting.

Can a Shorted Heating Element Cause This?

Yes, a damaged heating element that has split open and shorted out against the metal tank will constantly trip your system. When the protective outer casing of the element corrodes, the live electrical wire inside makes direct contact with the water. This creates an uncontrolled, continuous heating cycle that forces the safety limit switch to trip repeatedly to prevent a fire.

What Do the Ontario Codes Say About Water Heaters?

The Ontario Electrical Safety Code (OESC) mandates strict dedicated circuit rules and proper wire sizing for all electric water heating equipment. The code also requires a dedicated electrical disconnect switch located within sight of the water heater for safe maintenance access. Attempting to bypass a tripping high-limit switch directly violates these safety regulations and drastically increases the risk of a catastrophic tank explosion.

How Common Are Water Heater Electrical Failures?

Water heaters are one of the most heavily used appliances, accounting for roughly 19% of a Canadian home’s energy use. Consequently, aging components and electrical faults in water heaters contribute to approximately 11% of home heating fires annually. Replacing a faulty thermostat or element immediately is the best way to keep your home completely safe from these preventable disasters.

What Are the Expert Insights on Troubleshooting?

As a designated master electrician, I strongly warn homeowners to never just keep pushing the reset button hoping the problem goes away. Continually resetting a tripped high-limit switch forces a broken system to overheat, which can easily melt wires or destroy the tank. The safest approach is to use a digital multimeter to test both thermostats and heating elements for proper electrical continuity while the power is completely off.

Contact Us

If you are dealing with a faulty water heater, having a designated master electrician inspect your electrical system is the safest course of action.

Are you noticing any of these brighter lights flickering or humming, or is the brightness constant? Call us at 416-838-9006 or visit our contact page — we will be happy to help.