There’s nothing worse than stepping into the shower only to be met with a blast of cold water. If your hot water system has stopped working, don’t panic—there are a few things you can check before calling in a professional.
At Swish Plumbing, we’ve seen it all when it comes to hot water issues. In this guide, we’ll walk you through the common signs your system’s on the fritz, what to check depending on whether you’ve got gas or electric, when it’s time to call a plumber, and how to keep your hot water flowing with regular servicing.
Let’s get your system back on track.
Common Signs Your Hot Water System Isn’t Working
If your hot water has disappeared, or you’ve noticed any of the following, your system could be on its way out:
Inconsistent or lukewarm water
If your hot water runs out faster than usual or never gets properly hot, there could be a thermostat issue, sediment build-up, or a failing element.
Strange noises from the tank
Popping, banging, or rumbling sounds are usually caused by sediment build-up inside the tank. Not dangerous at first, but it does mean your system’s working harder than it should.
Rusty or discoloured water
Brown or rusty water coming from your hot taps? It could be corrosion inside your tank, especially if the anode rod has worn out.
Leaks
A small puddle might not seem like a big deal, but any leak around your system can quickly turn into water damage or a complete breakdown.
No hot water at all
Whether it’s a blown fuse, a pilot light that won’t stay on, or a full system failure, this is the most obvious sign something’s wrong.
What to Check If Your Hot Water Isn’t Working
Before you call a plumber, there are a few basic checks you can do yourself.
For Electric Hot Water Systems:
- Check the power supply
Is the switch on? Head to your switchboard and look for the dedicated hot water circuit. If the breaker’s tripped, try resetting it. - Reset the system
Some systems have a thermal safety switch that cuts out if it gets too hot. Look for a small red reset button—press it and see if that restores power. - Check the timer or off-peak settings
If your system is set to heat overnight, it might just not have kicked in yet. Double-check your settings.
- Look for obvious leaks
Water pooling under the tank could mean a burst pipe or internal damage—if you spot this, switch the system off and call a plumber.
For Gas Hot Water Systems:
- Check your other gas appliances
If your cooktop or heater isn’t working either, you may have a gas supply issue. - Look at the pilot light:
If it’s gone out, follow your system’s instructions to relight it (usually found on the front panel). If it won’t stay lit, you could have a faulty thermocouple.
- Listen for strange sounds
Rumbling or hissing noises from your unit? That could be a blocked burner or sediment build-up.
Electric vs Gas: Troubleshooting Tips
Still unsure what’s going on? Here’s a quick comparison.
Electric hot water systems often stop working due to issues with the heating element or thermostat. They’re commonly found in homes without natural gas and can take longer to reheat if there’s been a power interruption.
Gas systems, on the other hand, frequently run into problems with the pilot light or burner blockages. They also rely on proper ventilation and benefit from regular servicing. One advantage of gas systems is their faster recovery time compared to electric units.
No matter which system you’ve got, we’re experienced with all makes and models—so we can help you troubleshoot and fix the issue quickly.
When to Call a Professional Plumber
While it’s worth checking the basics, some hot water issues are better left to the pros. Here’s when to give us a call:
- There’s no hot water after basic checks
- Your system is leaking or making loud noises
- You smell gas or suspect an electrical fault
- The pilot light won’t stay on
- You’ve got rusty or discoloured water
- Your system is over 10 years old and acting up
We’ll assess whether your system can be repaired or if it’s time for a replacement. And if a new system’s needed, we’ll help you choose one that suits your household size and water usage.
Preventing Future Hot Water Issues
Want to avoid the drama next time? Regular servicing is the best way to keep your hot water system running smoothly and spot issues before they turn into expensive repairs.
At Swish Plumbing, we recommend a professional service every 1–2 years. Here’s what we check during a routine service:
Anode rod condition
The anode rod protects your tank from rusting. Over time, it corrodes to protect the tank lining, but once it’s used up, your system becomes more vulnerable to corrosion. We’ll check its condition and replace it if needed to extend the life of your unit.
Sediment build-up and flushing
Minerals in your water can settle at the bottom of your tank, creating a thick layer of sediment. This can reduce efficiency, make your system noisy, and even cause overheating. If there’s significant build-up, we’ll flush it out to keep things running efficiently.
Valve function, including the TPR valve
The temperature and pressure relief (TPR) valve is a crucial safety feature. If it’s faulty or leaking, it needs to be replaced to prevent potential pressure build-up. We’ll test all the valves to make sure they’re working properly.
Heating element and thermostat performance
If you’ve got an electric system, we’ll check the heating elements and thermostat to make sure they’re heating water to the correct temperature and functioning safely.
Signs of leaks, corrosion or pressure issues
We’ll inspect all fittings and the body of the tank for any early signs of rust, leaks, or pressure problems—so we can catch small issues before they turn into big ones.
A bit of maintenance now can save you a whole lot of hassle (and cash) later. If it’s been a while since your last check-up, give us a call—we’ll make sure everything’s working the way it should.
No More Cold Surprises
If your hot water system has stopped working, don’t stress. Sometimes it’s a simple fix—other times, you’ll need a plumber to step in. Either way, Swish Plumbing is here to help.
We’ll take the time to find the real issue, talk you through your options, and make sure you’re never left out in the cold.
Need help fast? Call Swish Plumbing at 0402 547 293 or book online today. We’ll have your hot water flowing again in no time.
