Rheem Hot Water System Not Working? Try This Guide

You listened to the marketing hype and decided to “Install a Rheem”? Good choice to keep that hot water coming on “Steady, hot and strong” – but what happens when yours stops working and you’re left with cold water after a long, hot day? Don’t worry, because like any appliance, they’re not perfect. But what do you do when your Rheem is no longer steady, hot and strong? Answer: Do some Rheem hot water system troubleshooting!

Introduction to Hot Water Systems

Hot water systems are a cornerstone of modern comfort, providing the hot water we rely on for showers, cleaning, and daily routines. Whether you’re running a bath or washing dishes, a dependable hot water system like a Rheem hot water system ensures you always have hot water when you need it. There are several types of hot water systems available, including electric, gas, and solar models, each designed to efficiently heat water for your household. Understanding how your hot water system works, and knowing what to do when your Rheem hot water isn’t performing as expected, can help you keep your home running smoothly and avoid the inconvenience of cold water. With the right knowledge, you can ensure your Rheem hot water system continues to heat water reliably, keeping your household’s hot water steady, hot, and strong.

Safety First: Precautions Before Troubleshooting

Before diving into fixes, always remember:

• Switch off power at the circuit breaker before touching an electric unit.
• For gas models, turn off the gas supply and ensure good ventilation.
• Valves may release very hot water under pressure – handle carefully.
• Never attempt electrical or gas repairs unless you’re licensed.

When in doubt, stop and call a professional plumber. For complex issues, error codes, or repairs involving heating elements, thermostats, or control boards, seek professional help. Only an approved plumber or licensed electrician should perform electrical work or repairs beyond basic maintenance to ensure safety and compliance.

Electric Hot Water System Components

Electric hot water systems, such as those from Rheem, are built around a few essential components that work together to deliver reliable hot water. The heating elements, usually found at the bottom and sometimes the top of the tank, are responsible for heating the water inside the unit. The thermostat monitors and controls the water temperature, ensuring your hot water is always at the right level for comfort and safety. To protect your system, the pressure relief valve automatically releases excess pressure, preventing potential damage or safety hazards. Regular maintenance is key to keeping your electric hot water system running efficiently—this includes checking the anode rod to prevent corrosion, inspecting for loose connections, and flushing the tank to reduce sediment buildup. By understanding these components and performing basic maintenance, you can extend the life of your hot water system and enjoy consistent, trouble-free hot water.

Gas Rheem Troubleshooting: Pilot Light & More

Gas systems have their own quirks:

• Check the pilot light – An extinguished pilot light is a common cause of no hot water in your Rheem gas hot water heater. Rheem provides a video guide on relighting safely. The pilot light ignites the burner, which then heats the water.
• Gas supply issues – Ensure your gas valve is in the “on” position and check the natural gas supply. Always follow safety precautions when handling natural gas.
• Thermocouple faults – If the pilot won’t stay lit, this part may need replacing.
• Flue blockages – Can cause poor ignition or system shutdown. Clearing blockages is essential for proper operation.

General Troubleshooting Steps

• Check error codes – Continuous flow Rheem units flash codes when something’s wrong. Look for display error codes or fault codes on the controller or indicator lights. Refer to the manual or Rheem site to identify what each code means for your specific model.
• Read the Rheem Troubleshooting Guide for official solutions.
• Check for leaks – Some dripping is normal during heating cycles, but constant leaks indicate valve faults. Persistent leaks may require necessary repairs by a professional.
• Fix temperature fluctuations – Ensure water-saving taps aren’t hindering flow. Also, check water flow and water pressure, as issues with either can cause inconsistent temperatures.

Read the Rheem Troubleshooting Guide: This guide covers a wide range of issues across the whole Rheem HWS range, not specific to a particular model or type.

Rheem Hot Water Troubleshooting by Model

Every type has its own common faults, and different Rheem models may display unique error codes or require specific troubleshooting steps. Always consult the user manual for your specific Rheem model to ensure correct procedures.

• Continuous Flow: Error codes help you diagnose ignition, flame failures, overheating, or other issues with the Rheem system.
• Storage Electric: Heating elements and thermostats most often fail, disrupting the heating cycle and affecting the amount of stored hot water available.
• Gas Storage: More likely to have pilot light, gas valve, or thermocouple issues in the hot water unit, which can prevent proper heating water.
• Heat Pumps: Look for controller light error codes, airflow issues, odd sounds, or thermistor temp faults that may trigger error codes.
• Solar: Shading, pump faults, or booster problems are the main culprits.

Rheem Error Code Reference Chart

Some key codes for Rheem continuous flow units include:

• 11 – Ignition failure
• 12 – Flame failure
• 14 – Overheating

Rheem units display error codes and fault codes on the digital display or through flashing indicator lights. On heat pumps, flashing lights indicate different faults depending on the model. Always consult your Rheem manual or owner’s manual for detailed explanations of display error codes and fault codes, as well as troubleshooting steps.

Solar Rheem Systems: Common Problems and Solutions

Solar hot water systems have their own unique issues:

• Check for shading on solar collectors.
• Check the pump is working.
• Inspect the booster (gas or electric).
• Look for glycol leaks (closed-loop systems).

Do you have a Heat Pump?

Rheem heat pumps are energy-efficient but will also show controller flashing codes when a problem occurs. Different models like the 310L and 325L may have slightly different codes, so always refer to the manual.

How to Reset Your Rheem Hot Water System

Often, a reset fixes minor problems:

1. Turn off power.
2. Wait 30 seconds.
3. Turn it back on and let the system reheat. Note: Reset methods vary by model, check your manual.

For LPG users experiencing ignition or flame failure, first close the hot tap, cycle power to the unit, check the propane bottle level to ensure there is sufficient gas, and then open the hot tap to attempt a reset. Always consult the user manual for model-specific reset instructions.

Hot Water Systems and Energy Efficiency

The energy efficiency of your hot water system can have a big impact on your household’s energy bills. Rheem hot water systems are engineered with energy efficiency in mind, featuring advanced insulation and smart heating controls to minimize heat loss and reduce running costs. To get the most from your hot water system, consider adjusting your thermostat settings to the recommended temperature, installing flow restrictors to limit unnecessary hot water use, and keeping up with regular maintenance to prevent issues like sediment buildup that can reduce efficiency. Choosing an energy-efficient Rheem hot water system tailored to your household’s size and hot water usage can help you save money while ensuring you always have hot water on demand. By making smart choices and maintaining your system, you’ll enjoy lower energy bills and reliable hot water for years to come.

Rheem Repair Costs in Australia

Here’s what you can expect for common repairs:

• Thermostat replacement: $150–$300
• Heating element: $200–$400* Pressure relief valve: $150–$250
• Pilot light/ignition: $150–$350
• Full tank replacement: $1,200–$2,500+

Keep in mind that scheduling a service call or booking a service call for professional repairs may incur additional charges.

Repair or Replace? Deciding on Your Rheem

• Repair if: Unit is under 8 years old, costs are minor and no tank damage. Necessary repairs, such as fixing malfunctioning burners, noisy or leaking systems, or issues with heating elements or thermostats, should be carried out by a professional to ensure safety and restore proper function.
• Replace if: Unit is 10–12 years old, tank is leaking or repairs are over 50% of replacement.

Check Your Rheem Warranty

Before you book a repair, always check:

• Find your model and serial number.
• Call Rheem on 1300 556 036.
• Check what’s covered (tanks 7–12 years, components 1–3 years).
• Understand how to lodge a warranty claim.

DIY Rheem Maintenance: Monthly Check

Simple checks can extend the life:

• Exercise the relief valve.
• Check anode rod every 3–5 years.
• Flush a few litres every 6–12 months for sediment removal.
• Keep the area clear of clutter.

If your temperature is inconsistent, you’ll need a hot water plumber to do any modifications or to check the tempering valve.

Rheem Maintenance Schedule

For system longevity:

• Every 6 months: Test relief valves.
• Every year: Have a plumber service the system.
• Every 3–5 years: Replace anode rod.

Compliance and Legal Requirements

In Australia:

• Only licensed plumbers can work on valves, fittings and any part of the system connected to mains.
• Only licensed gas fitters can service or repair gas heaters.
• Electrical wiring must be done by a licensed electrician.

Rheem Hot Water FAQs

• Why is my water warm? Thermostat or booster issue. If adjusting these does not restore hot water flowing, check for other faults or contact a professional for troubleshooting.
• Why does my pilot light keep going out? Thermocouple or draft issue.
• Why is my unit noisy? Sediment in the tank.
• Why is water leaking? Relief valves can drip but steady leaks need repair.

Installation & Warranty

• Installation – Simple changeovers $300, complex jobs $800+.
• Warranty – Tanks 12 years, labour 12 months, components 1–3 years.
• Always use a licensed plumber to keep your warranty valid.## Save Energy: Rheem Tips & Rebates
• Call Rheem 1300 556 036 to check your warranty

Save money and get more efficiency:

• Insulate pipes to reduce heat loss.
• Set thermostat to 60°C.
• Fix leaky taps and dripping showers.
• Use cold water for laundry.
• Check government rebates: solar and heat pump installations may qualify for STCs (Small-Scale Technology Certificates) and state-specific rebate programs.

Watch & Fix: Rheem Video Tutorials

Rheem has videos on their support site and YouTube channel. Tutorials cover:

• Relighting gas pilot lights, including troubleshooting and relighting the pilot light on a Rheem hot water heater.
• Resetting continuous flow models.
• Basic maintenance. Watch before you try to save time and avoid mistakes.

When to DIY and When to Call a Pro

• DIY: Relight pilot lights, reset the system, adjust thermostats, or check for leaks.
• Call a Pro: Electrical, gas or major component repairs.

Call Rheem: Support and Hours

Still not fixed? You can always call:

• Customer Support: 1300 556 036

Website: www.rheem.com.au/contact-us

Rapid Service Plumbing: Your Hot Water Hero

Your Rheem is reliable but it’s still a complex piece of technology. Hopefully our Rheem hot water systems troubleshooting guide has fixed the issue but if not or you’re sure something more serious is going on, call the friendly team at Rapid Service Plumbing. We’re available 24/7 in emergencies, we offer no obligation quotes and upfront pricing and we guarantee our workmanship – forever! Our plumbers service the greater Sydney areas including Canterbury-Bankstown, City of Sydney, Eastern Suburbs, Hills District, Inner West, Sutherland Shire, North Shore, and Northern Beaches. Not only that, our Melburnian neighbours can now experience high-quality plumbing services as we have expanded to Melbourne! Rapid Service Plumbing is only ever a single call away for advice and a rapid response, so don’t hesitate to get in touch.