Rheem Instant Hot Water Trouble Shooting

Rheem: A Household Name in Australian Water Heating

Rheem has become synonymous with quality and reliability in the Australian water heating market. Renowned for their durability and backed by extensive after-sales support, Rheem is a brand that we use and recommend

Power Outages Will Stop Your Hot Water

Rheem’s tankless water heaters, predominantly gas-powered with electronic ignition, require a minimal amount of electricity to operate their control panels, sensors, and ignition systems.
In the event of a power outage, these units will cease to produce hot water, as the electronic components necessary for initiating the heating process are without power.

Initial Checks: Gas Supply and Electrical Connections

The First Step in Fault Diagnosis

Encountering issues with your hot water system can be daunting. The first thing is to check the supply and electrical connections as your initial troubleshooting steps.
If you have a gas hot water or gas heating appliance and notice a flashing digital monitor, the first step is to check if the gas supply is turned on at the gas meter or gas LPG cylinders. Additionally, ensure that the electrical supply is turned on. These basic checks can help determine if the fault is related to the gas or electrical connection.

Understanding the Roots of Hot Water Faults

Hot water system faults can arise from a variety of issues beyond just gas supply and electrical problems. Recognizing signs such as a flashing digital monitor, which could hint at pilot flame pressure drops or other specific fault conditions.
Knowing where to start can simplify the troubleshooting process.

Deciphering Rheem Error Codes for Efficient Troubleshooting

Rheem tankless water heaters use error codes to help diagnose issues, making troubleshooting more straightforward for homeowners and professionals alike. These codes display on the unit’s LCD screen, providing valuable information on what may be causing a problem. Here’s a summary of common error codes for Rheem instant hot water systems and their potential solutions:

  • Error Code 1L: Indicates a buildup of limescale in the heat exchanger, affecting water flow and temperature. The recommended action is descaling the water heater.
  • Error Code 05: Suggests there might be a blockage or improper installation of the air supply pipe or exhaust vent. Checking for obstructions and ensuring correct installation could resolve this issue.
  • Error Code 11: Points to the gas shutoff valve not being fully open, which could restrict gas flow to the main burner. Fully opening the gas shutoff valve and checking for obstructions in the gas supply should address this problem.
  • Error Code 12 and 13: Error 12 indicates insufficient gas supply, while 13 suggests poor or improper combustion. Ensuring an uninterrupted gas supply and checking the air intake and exhaust venting for correct installation and function are advised.
  • Error Code 29: Involves a clogged condensate neutralizer, necessitating contacting a technician for assistance.
  • Error Code 31, 32, 33, and 34: These codes relate to issues with various thermistors (inlet, heat exchanger temperature, outlet, and ambient air, respectively), often due to faulty wiring or dirt/debris. Checking and cleaning the wiring can help reset these errors.
  • Error Code 65: Indicates a water volume control fault, which could be due to a defective wire connection or a faulty water control assembly. Checking water flow through the unit and inspecting voltage readings might be necessary steps.
  • Error Code 76: Suggests a communication fault with the remote control, requiring a check of the remote control wiring or potentially a faulty capacitor.
  • Error Code P1: This code is triggered by insufficient water flow to activate the unit. Cleaning the inlet filter or adjusting the flow rate might resolve the issue.

For more specific issues such as Error Codes E5, E4, and beeping sounds, these often indicate high flow rates, flow meter sensor issues, and general operational faults, respectively. Ensuring proper flow rates, checking sensor operations, and a general reset of the unit can often clear these errors.

Resetting the Rheem tankless water heater is a common first step in troubleshooting, involving turning off the device and waiting about 20 minutes before turning it back on. If the error persists, consulting the owner’s manual or contacting a professional is advisable, especially for complex issues or when unsure of the correct action to take​​​​​

Beyond Error Codes: Other Common Rheem System Issues

Other troubleshooting areas not covered by error codes.

  • Mineral Buildup: Affects water flow and heating efficiency.
  • Gas Supply Issues: Can prevent ignition or sustained flame.
  • Venting Problems: Disrupt the system’s operational capability.
  • Electrical Faults: Lead to system failure.
  • System Overload: Causes shutdowns or failure, underlining the importance of adhering to the system’s capacity.

Remember, while some issues can be resolved with basic maintenance, others may require the expertise of a professional. Always prioritize safety, especially when dealing with gas and electrical components.

Rheem’s Stature in Australian Homes

Rheem’s commitment to delivering high-quality, innovative, and efficient water heating solutions has made it a preferred choice among Australian consumers. The brand’s extensive product range, combined with exceptional customer service, has solidified Rheem’s reputation as a leader in the water heating sector.

Conclusion: Navigating Troubleshooting with Expertise

Troubleshooting a Rheem instant hot water system involves understanding the nuances of the system’s operations and recognizing when professional help is necessary.
Downie Pluming and Gas delivers expert plumbing advice and installations and we are well versed is fixing the common issues that can go wrong with a Rheem hot water system.
See more about our gas hot water systems and installation.


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