Waking up to a freezing cold shower is the worst way to start a Sydney morning. If your Rheem hot water system is not working, you want answers and you want them fast. As a family-owned plumbing business servicing the Northern Beaches, North Shore and Eastern Suburbs, we see hot water emergencies every single day.

At Hardie & Co Plumbing, our mission is to change the bad reputation of plumbers. That means showing up ready, communicating clearly, and giving you honest advice before we even pick up a wrench. This guide will help you understand exactly what is going wrong with your Rheem unit, what you can safely check yourself, and when it is time to call in a licensed professional.

Quick Diagnosis: What Are Your Symptoms?

Before you panic, take a minute to look at what your system is actually doing. Finding the exact symptom is the first step to getting your hot water back on track.

• No hot water at all? This usually points to a power issue, a blown heating element, or a pilot light that has gone out.
• Water is only lukewarm? Your thermostat might be failing, or your system is too small for your household demand.
• Is the system leaking? A leak from the top or side valves is often a cheap repair. A leak from the bottom of the tank usually means the unit needs replacing.
• Hearing strange noises? Banging or popping sounds often mean sediment has built up at the bottom of your tank, or the water is boiling due to a faulty thermostat.

Depending on your specific issue, jump to the relevant section below to start troubleshooting.

Rheem Gas Hot Water System Not Working

If you have a Rheem gas hot water system not working, there are a few simple things you can check safely before calling a tradie. However, it is crucial to remember that under NSW Fair Trading rules, all gas fitting work must be performed by a licensed professional. Never try to repair or modify gas lines yourself.

Safe DIY Checks for Homeowners:

• Check other gas appliances: Turn on your gas stove or heater. If they are not working either, the problem is with your main gas supply, not just your hot water unit. Contact your gas provider.
• Check the gas isolation valve: Ensure the yellow handle on the gas pipe leading to your hot water system is turned parallel to the pipe (which means it is open).
• Check the pilot light: For older storage units, the pilot light may have blown out in high winds. Follow the exact instructions on the inside of the access panel to safely relight it. If it keeps going out, you likely have a faulty thermocouple.

When to call a plumber: If the pilot light will not stay lit, you smell gas, or your continuous flow digital controller has no power, turn off the gas supply immediately and call our emergency plumbing team.

Rheem Electric Hot Water System Not Working

Electric hot water systems are incredibly common across northern Sydney. If your Rheem electric hot water system not working is causing you grief, the issue is almost always electrical.

Safe DIY Checks for Homeowners:

• Check your switchboard: Go to your home electrical box and look for the hot water circuit breaker. Has it tripped? If so, flip it back on.
• Monitor for repeat tripping: If the breaker trips again immediately or after a few minutes, do not keep resetting it. This is a clear sign of an electrical short, a burned-out heating element, or a failed thermostat.
• Check your off-peak meter: If your system runs on an off-peak tariff, your power provider might have a localized fault preventing the system from heating overnight.

When to call a plumber: Do not ever open the electrical panel on your hot water tank. Water and electricity are a deadly combination. Call a licensed plumber to safely test and replace faulty elements or thermostats.

Rheem Hot Water System Leaking

Finding a puddle of water around your tank is stressful. If you have a Rheem hot water system leaking, where the water is coming from tells us exactly what needs to be done.

Step 1: Emergency Shutoff

If water is gushing out, you need to stop the flow to prevent property damage. Look for the small tap (isolation valve) on the pipe feeding cold water into the bottom of the tank. Turn it clockwise until it stops. Next, turn off the power at the switchboard or turn off the gas supply valve.

Step 2: Find the Leak

• Leaking from the Pressure Temperature Relief (PTR) valve: This valve sits near the top of the tank and has a small pipe running down the side. It is completely normal for this to drip slightly as the water heats and expands. But if it is constantly running or gushing, the valve is jammed or broken. This is a very common and affordable repair.
• Leaking from inlet/outlet connections: Sometimes the pipes connecting to the tank become loose or the seals wear out. A plumber can tighten or replace these fittings easily.
• Leaking from the bottom of the tank: This is the worst-case scenario. If water is pooling from the base of the cylinder itself, the internal steel tank has rusted through. There is no way to patch an internal tank leak. The entire system will need to be replaced.

Common Rheem Fault Codes

If you have a Rheem continuous flow (tankless) system, it will likely flash an error code on the digital controller when something goes wrong. Here are the most common codes we see across the Northern Beaches and North Shore:

• Code 11: Ignition failure. The system tried to light but failed. Check if your gas supply is turned on.
• Code 12: Flame failure. The flame lit but went out. This often points to a dirty flame sensor or a gas pressure issue.
• Code 14: Overheating switch activated. The system got too hot and shut itself down for safety.
• Code 29: Heat exchanger issue. Often caused by scale build-up restricting water flow.

If clearing the code by turning the hot water tap off and on does not work, you will need a licensed plumber to diagnose the internal components.

Repair vs Replace: Making the Right Call

When your hot water system breaks down, the biggest question is whether to fix it or upgrade it. At Hardie & Co Plumbing, we believe in upfront pricing with no hidden costs, so we will always give you a straight answer.

As a general rule, a quality Rheem hot water system will last between 10 and 15 years. If your system is under 10 years old and has a blown element, a faulty thermostat, or a broken PTR valve, repairing it is absolutely the most cost-effective choice.

However, if your system is over 10 years old and is experiencing major faults or internal tank leaks, replacing it is the smarter financial decision. Pumping money into an old, rusting tank is a false economy. Upgrading also allows you to take advantage of the NSW Energy Savings Scheme rebates, which can significantly reduce the cost of installing a highly efficient heat pump or solar hot water system.

When to Call a Plumber (And How We Can Help)

If you have run through the basic checks and your hot water is still not working, it is time to call the experts. Plumbing, electrical, and gas work are strictly regulated by NSW Fair Trading for your safety. Attempting unlicensed DIY repairs will void your Rheem warranty and put your home at risk.

At Hardie & Co Plumbing, we have over a decade of experience fixing hot water systems across the northern suburbs of Sydney. We are a 5-star rated, fully licensed and insured team that prides itself on doing the job right the first time.

We offer:

• $0 call-out fee
• 24/7 emergency service (we offer same-day service for urgent hot water jobs)
• Upfront pricing so you know the cost before we start
• Lifetime labour warranty on all our workmanship
• $50 discount for locals

Frequently Asked Questions

Why has my Rheem hot water stopped working?

The most common reasons are a tripped electrical circuit breaker, a blown heating element, a broken thermostat, or a blown-out pilot light on gas models. Age and sediment build-up also play a huge role in system failures.

How do I reset my Rheem hot water system?

For electric systems, you can reset the unit by checking your main household switchboard and flipping the hot water circuit breaker off and back on. For continuous flow gas systems, turn off the hot water tap, turn off the power to the unit at the wall switch, wait 30 seconds, and turn it back on. Never attempt to reset internal safety switches on the tank itself.

How long do Rheem hot water systems last?

With regular maintenance (like replacing the sacrificial anode every 5 years), a standard Rheem storage tank will last between 10 and 15 years. Continuous flow gas units can last up to 20 years if serviced regularly.

Is a leaking hot water system dangerous?

Yes, it can be. A leaking electric hot water system poses a severe risk of electrical shock. A leak can also cause scalding hazards and massive water damage to your property. Always turn off the water and power supply if you discover a significant leak.