Post By Admin
May 26, 2026When your hot water suddenly disappears, it’s easy to jump to conclusions. You might assume your water heater has broken down completely or, worse, that you’ll need to replace it. But in many cases, all you really need to do is reset the water heater.
This guide is designed for electric water heaters. If you have a gas hot water system, you may need to relight a gas water heater instead of performing a reset.
If you’d rather skip the troubleshooting and have someone handle it for you, you can always book a professional through our hot water services.
What Is the Reset Button on a Water Heater?
Before you open anything or press any buttons, it helps to understand what the reset button on water heaters is actually for.
Most electric water heaters come with a high-limit switch, which is a built-in safety feature. This switch monitors the water temperature and turns the power off if the water gets too hot.
The reset button on water heaters gives you a chance to restart the system once things have cooled down or the issue has been fixed.
However, if you find yourself resetting your water heater repeatedly, that’s not normal. The reset button on water heaters is not designed to be a routine fix. It’s a warning that something might be wrong inside the unit.
On many Australian electric units, the high-limit switch will trip when water temperatures exceed approximately 80–90°C. This safety feature helps prevent overheating and potential damage to the system.
The reset button is designed to protect your hot water system if a thermostat fails or temperatures rise beyond the correct temperature setting. For Australian homes, outlet temperatures are generally limited to a maximum of 50°C under AS/NZS 3500 requirements.
Why Does the Reset Button Trip?
Before learning how to reset a water heater, you need to understand the common reasons why it needs resetting. Usually, it helps to fix common hot water issues, such as:
- Overheating: The water gets hotter than it should, often due to a malfunctioning thermostat.
- Faulty thermostat: If the thermostat doesn’t shut off the heating element at the right time, the water can overheat.
- Defective heating element: Sometimes, the heating element itself fails, creating a short or continuous heating.
- Electrical issues: Loose wires or power surges can trip the reset switch.
- Sediment buildup in your water heater: Mineral deposits can accumulate inside the tank, reducing efficiency and causing uneven heating.
So, while the reset button might get your hot water back for now, it’s also worth paying attention to these underlying issues. You may need to service the hot water system regularly to prevent future disruptions.
Things to Check Before Resetting a Water Heater
Before you hit that reset button, it’s always a good idea to do a quick safety check. You definitely don’t want to accidentally make a small issue worse!
- First, just take a look around the base of the unit. Do you see any puddles, leaks, or even just a bit of moisture? Since water and electricity are a dangerous combo, you’ll want to get to the bottom of any damp spots before doing anything else.
- Next, use your eyes and nose and watch out for any scorch marks, melted plastic, or weird burning smells. If you notice any of these, it’s a huge red flag that something is wrong internally.
- Finally, go check your electrical panel to see if the circuit breaker for the water heater has tripped.
If anything looks sketchy, damaged, or just unsafe, don’t try to reset it yourself. Play it safe and call in a licensed professional to take a look.
Step-by-Step: How to Reset Your Water Heater
Let’s walk through the process of how to reset a water heater. This will work for most electric water heaters that have a visible reset button, but if you’re dealing with a gas unit, your steps may differ slightly. You may want to read more about how a gas hot water system works.
Step 1: Turn Off Power at the Circuit Breaker
Water heaters operate at high voltage, and touching the internal components while it’s powered can be extremely dangerous.
Go to your home’s switchboard and locate the circuit breaker for the water heater. In many homes, this is a double-pole breaker labelled “Hot Water” or “Water Heater.”
Switch it to the OFF position before continuing.
Step 2: Open the Access Panel
Most electric water heaters have two thermostat panels: an upper and a lower one. The reset button on water heaters is typically located behind the upper access panel.
Use a standard screwdriver to remove the panel screws. Once open, you’ll likely see a layer of insulation inside. Gently pull it back to reveal the thermostat and reset button.
What you’re looking for is a small red button, usually near the top of the thermostat.
Step 3: Press the Reset Button
Now that you’ve found the button, press it firmly with your finger. You may feel a soft click as it resets.
If the button pops right back out or won’t stay in, that’s a sign that the water heater is still detecting a problem. Don’t try to force it. The reset function is designed to reject unsafe operation.
Note: Before pressing it, check the insulation carefully. If it feels damp or wet, stop immediately. Damp insulation often indicates an internal leak, and the unit should be inspected by a professional before being reset.
Step 4: Put Everything Back in Place
Once you’ve pressed the reset button, replace the insulation you moved aside, then screw the access panel back onto the unit.
It’s important not to leave this panel off. The insulation helps regulate the internal temperature and prevents any electrical contact.
Step 5: Restore Power and Wait
Return to your circuit breaker and switch the power back on. The water inside the tank needs time to heat up again. Depending on your tank size, this may take:
- 30 to 45 minutes for smaller tanks
- 60 to 90 minutes for standard-sized tanks
- Up to 2 hours for large-capacity units
Avoid running hot water taps during this time. You’ll get the best result if the tank has time to heat undisturbed.
Step 6: Test Your Hot Water
After the wait, turn on a hot tap at your kitchen sink or bathroom. The water should gradually heat up. If the water is still cold, or if the reset button trips again soon after, then something else is going on inside the system.
You may be dealing with a thermostat that’s no longer accurate or even a heating element that’s malfunctioning. It’s also possible that sediment build-up is affecting the efficiency of your tank, making the water heat unevenly.
How Long Until Hot Water Returns?
After resetting an electric water heater, the waiting time depends on the size of the tank.
Typical heating times include:
- 50L tank: Approximately 45–60 minutes
- 80L tank: Approximately 60–90 minutes
- 125L tank: Approximately 90–120 minutes
- Large-capacity systems: Up to 2 hours or longer
If you’re wondering why your system is taking longer than normal, read our guide on how long it takes to heat up.
When to Call a Plumber Instead
Sometimes a reset solves the problem. Other times, it simply reveals a bigger issue.
Contact a professional if:
- The reset button keeps tripping within hours or days.
- You still have no hot water after waiting more than two hours.
- The insulation inside the unit is damp or wet.
- There is visible water pooling around the tank.
- You notice burning smells, scorch marks, or signs of electrical damage.
- The system is more than 10 years old and problems are becoming more frequent.
These symptoms often point to larger common water heater problems that require professional diagnosis.
If you need help, Neighbourhood Plumbing provides 24/7 emergency assistance and professional hot water services across Melbourne. You can also learn more about who to call for water heater repairs if you’re unsure where to start.
Frequently Asked Questions About Resetting Water Heaters
If you’re still unsure about whether resetting your water heater is the right move, these frequently asked questions will help clear things up:
Is it safe to reset my water heater?
Yes, as long as you follow proper safety steps, especially turning off the circuit breaker first. That part can’t be overstated.
The reset button is a built-in safety feature, so pressing it is part of standard maintenance.
However, if you find yourself resetting it often, it’s not safe to keep doing so without investigating the cause.
Do I have to turn off the breaker before resetting it?
Yes, always turn off the power before touching anything inside the heater. Even if the unit seems inactive, the electrical components inside can still carry a dangerous charge. Never assume it’s safe unless the breaker is off.
Why does my water heater reset button keep tripping?
A reset button that trips repeatedly usually indicates an underlying problem such as a faulty thermostat, damaged heating element, wiring issue, or overheating condition. It should not be ignored.
My water heater has two access panels. Do I need to reset both?
No. The reset button is typically located behind the upper access panel. Most homeowners only need to access the upper thermostat assembly.
What does it mean if the reset button won’t stay in?
If the button immediately pops back out, the unit is detecting an active fault. Continuing to press it is unlikely to solve the problem and may create a safety risk.
What might a water heater repair cost?
Repair costs vary depending on the fault. Replacing a thermostat is generally less expensive than replacing heating elements or the entire system. A professional inspection is the best way to determine the exact cause and repair requirements.
Conclusion
Knowing how to reset a water heater is useful, especially if it’s a quick fix and you may not need professional help.
You can also learn more about how long water heaters typically last so you can plan ahead for replacements if needed.
However, if your heater keeps needing a reset, or if hot water isn’t coming back as expected, resetting is only masking a larger issue.
In that case, your next best move is to bring in a licensed plumber. There are many reasons, like troubleshooting the thermostat, replacing a heating element, or checking if the hot water pressure has gone low, that may cause hot water issues.
If you’re ready to get your system checked or serviced, Neighbourhood Plumbing offers reliable, local plumbing service you can count on.
Explore more at Neighbourhood Plumbing, or contact us today!
About the Author
From unclogging the toughest drains to repairing leaking toilets, Ricky is a seasoned plumber who has brought his craftmanship to homes across Melbourne. He is passionate about sharing plumbing tips just as much as he is about fixing your plumbing issues. So, when your taps or pipes begin leaking, you know who to call.
