Error 92 appears on condensing Rinnai models and means that the neutralizer has reached the end of its life or is clogged. The neutralizer is responsible for treating acidic condensate before it’s drained away.
There’s no quick DIY fix for this—neutralizers need to be inspected and replaced by a technician to prevent condensate damage to the system or plumbing.
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This is a limescale warning. It means the heat exchanger has built up scale from hard water, which can reduce performance, raise energy use, and eventually lead to failure.
While the unit might still function, you should act promptly. A descaling treatment will restore efficiency. This must be done by a qualified technician using proper equipment.
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SE stands for “System Error” and usually indicates a communication failure between components—such as between the water heater and a controller.
Check the connection cable if your controller is wired, or move closer if it’s a wireless controller. If the error persists, a technician will need to inspect for faults in the circuit board or communication wiring.
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Error 41 means the ambient temperature sensor has failed. This sensor helps the unit adapt to surrounding environmental conditions, especially in cold weather.
There’s no way to bypass or reset this error manually. The sensor will need testing and likely replacing by a licensed technician.
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Error 11 is a common ignition fault. It means your water heater failed to light. Causes may include no gas supply, a faulty igniter, or issues with flame sensing.
You can do a basic check yourself: Open a hot water tap and listen—do you hear the fan start, gas valves clicking, and the igniter clicking? If you don’t smell any gas or hear ignition clicks, there may be no gas supply or a valve issue. If you hear ignition but no flame lights, the igniter or flame rod could be at fault. Either way, Error 11 requires professional attention.
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This error indicates a fault with the gas modulating valve. This component controls the amount of gas sent to the burner based on your hot water needs.
You may notice inconsistent water temperatures or ignition failure. Unfortunately, this is not something that can be tested without proper tools. Book a service with a qualified gas fitter.
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This code means ignition started, but the flame was lost. It’s often caused by low gas pressure, a faulty flame rod, or issues with the gas valve.
If this error happens repeatedly, it usually indicates a more complex fault. Check that your gas supply is active and isolation valves are fully open. If gas is flowing and the error continues, contact a licensed professional.
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Error 61 signals a fault with the combustion fan. This fan expels combustion gases and draws in fresh air to keep the unit running safely.
Check the area around the flue for any debris, nests, or obstructions. If it’s clear and the error persists, the fan may be worn out or electrically faulty. You’ll need a professional to test and replace it if necessary.
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Error 14 signals that the over-temperature sensor or thermal fuse has been triggered. This usually means the unit is overheating.
This isn’t something that can be fixed without technical skills. The system may still operate briefly but will shut down again for safety. Do not attempt to reset or bypass this yourself—it needs inspection by a qualified technician.
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Error 65 indicates that the water flow control valve isn’t functioning correctly. It may not be adjusting the flow rate as needed, or could be stuck.
If you’re experiencing irregular water flow or temperature, this valve could be the culprit. Unfortunately, it’s an internal component and not something you can safely access or service yourself.
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Error 16 means the water heater has detected that the water temperature has exceeded safe limits. It’s a high-temperature warning designed to protect the unit and your household.
This one should not be ignored. While the unit may still work intermittently, persistent overheating is a serious issue. It could be related to scale buildup, a faulty thermostat, or sensor problems. A licensed technician will need to inspect and test the components.
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This code signals a problem with the bypass valve, which works alongside the main flow control to maintain consistent water temperature.
Bypass valve faults usually result in fluctuating temperatures or sudden cold water bursts. This component needs to be tested and potentially replaced by a qualified technician.
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Error 19 indicates an electrical earth connection fault inside the unit. It can be triggered by moisture, corrosion, or component wear.
There are no safe DIY fixes for this one. Electrical issues within the unit require licensed professionals to test, isolate, and repair the fault.
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Error 70 points to a fault in the unit’s internal microprocessor—essentially the brain of your water heater. This could be due to a surge, moisture, or hardware failure.
You can try resetting the system by turning it off at the power point for 30 seconds, then switching it back on. If the error reappears, the control board may need servicing or replacement.
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This error means the internal settings of the water heater don’t match the actual installation. It’s often due to incorrect dipswitch or programming settings during install or servicing.
Resetting dipswitch settings or reprogramming should only be done by a licensed technician. In most cases, the error won’t clear until the settings are corrected to match your heater’s setup.
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Similar to Error 70, this code also refers to a microprocessor fault—often related to signal irregularities or internal circuitry problems.
As with Error 70, try a full power reset. If that doesn’t resolve it, professional diagnostics are needed to determine if the PCB (printed circuit board) has failed.
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This error typically relates to a condensate drain fault in condensing models. It means the condensate produced during operation isn’t draining correctly, potentially causing system shutdowns.
Check around the base of the unit for any obvious drain blockages or kinks in the hose. If there’s visible water pooling or evidence of overflow, don’t try to fix it yourself—water and electronics don’t mix.
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This error points to a flame detection circuit fault. The system isn’t able to verify the flame during ignition, even if the burner is operating.
It may be caused by carbon buildup on the flame rod, wiring issues, or a faulty sensor. Cleaning or replacing the sensor is typically required—this is a job for a licensed gas fitter.
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Error 32 means the outgoing water temperature sensor isn’t reading correctly. This could be caused by sensor failure, loose wiring, or temperature drift.
There’s nothing safe to check as a homeowner here—temperature sensors need testing and replacement by a qualified technician. If the error appears repeatedly or shuts the unit down, book a service.
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Error 33 points to a fault with the heat exchanger outlet temperature sensor. This sensor monitors the water as it exits the heat exchanger to ensure it doesn’t overheat.
This is a component-level fault that typically requires sensor replacement or testing of the wiring. There are no safe DIY fixes for this one—leave it to the professionals.
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Error Code 03 typically occurs when there’s a power disruption during a bath fill cycle. It prevents the unit from resuming operation automatically once power is restored, as a safety precaution.
Try resetting the unit by turning off all hot water taps, waiting a few seconds, then turning the unit off and on again at the controller (if fitted). If this doesn’t clear the error, you’ll need a licensed technician to inspect and reset the system properly.
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This error means the combustion temperature sensor has detected abnormal temperatures. It could be due to blocked airflow, excess heat, or a sensor fault.
First, check for any obvious obstructions near the flue or air intake. If everything looks clear, the issue is likely internal. Don’t attempt repairs yourself—faulty combustion can be dangerous.
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Error Code 10 indicates a problem with airflow—usually a blocked or restricted flue or air intake. This means your unit isn’t getting enough oxygen to operate safely.
Check the area around your unit’s air intake and flue outlet for any obstructions like leaves, dirt, or debris. Clear away anything that could be restricting airflow. If the error persists, internal inspection by a licensed gas plumber is required.
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Error Code 71 indicates a fault with the “Gas Solenoid Valve” on your Rheem Continuous Flow Water Heater. This valve controls the supply of gas to the burner, and a malfunction can cause ignition or operational issues.
For your safety, immediately switch off electrical power and close the gas supply valve. Gas valve faults pose serious risks and require immediate professional attention. Contact Hilton Plumbing urgently to inspect and repair your unit safely.
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Error Code 72 signifies a fault with the “Flame Sensing Device” in your Rheem Continuous Flow Water Heater. This sensor confirms proper ignition and operation of the burner. A malfunction may cause operational shutdowns or ignition failures.
Immediately turn off the electrical supply at the isolation switch and shut off the gas supply valve. Due to the importance of flame detection in ensuring safety, this issue requires professional diagnosis and repair. Contact Hilton Plumbing urgently to safely resolve this fault.
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Error Code 73 on your Rheem Continuous Flow Water Heater indicates a malfunction in the “Burner Control Circuit.” This involves internal electrical and gas components essential for proper burner operation and safe ignition.
Turn off the electrical supply at the isolation switch and ensure the gas supply valve is closed immediately. Burner control circuit faults involve critical internal components and pose safety risks if not handled professionally. Contact Hilton Plumbing to arrange an immediate, safe inspection and repair.
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Error Code 75 indicates an “Internal Control System Fault” on your Rheem Continuous Flow Water Heater. This typically points to an issue within the internal electronic components controlling unit operations.
For safety, immediately switch off the electrical supply at the isolation switch and close all hot water taps. Due to the internal electronic nature of this fault, professional diagnosis and repair are essential. Contact Hilton Plumbing promptly to inspect and correct this issue.
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Error Code 35 signifies an “Improper Thermistor Connection” on your Rheem Continuous Flow Water Heater. This indicates a wiring or connection fault involving the unit’s internal temperature sensors.
Immediately switch off the electrical power at the isolation switch and ensure all hot water taps are closed. Because this fault involves critical internal wiring and sensor connections, professional expertise is essential. Contact Hilton Plumbing urgently for a safe and thorough inspection and repair.
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Error Code 79 indicates a “Fan Motor Current Detection Failure” on your Rheem Continuous Flow Water Heater. This fault suggests the combustion fan motor is experiencing issues, preventing proper airflow and safe operation.
Immediately turn off electrical power at the isolation switch and close all hot water taps. Fan motor faults involve critical internal components necessary for safe combustion. Therefore, professional inspection and repairs are required. Contact Hilton Plumbing promptly to address this issue safely.
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Error Code 51 indicates a “Gas Valve Fault” on your Rheem Continuous Flow Water Heater. This error signifies a malfunction or improper operation of the internal gas control valve, preventing safe ignition or operation.
Immediately turn off the power at the isolation switch and shut off the gas supply valve. Due to the nature of this fault involving gas components, do not attempt any repairs yourself. Contact Hilton Plumbing urgently for a safe, professional inspection and repair.
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Error Code 80 on your Rheem Continuous Flow Water Heater means “Gas Cut-Off Defective.” This fault occurs when the gas cut-off mechanism, crucial for safe operation, malfunctions or fails to operate correctly.
Immediately switch off both electrical power and gas supply at their respective isolation points. A faulty gas cut-off mechanism poses serious safety risks and should never be repaired by homeowners. Contact Hilton Plumbing urgently for professional diagnosis and repair.
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Error Code 52 indicates a “Gas Modulating Valve Fault” on your Rheem Continuous Flow Water Heater. This valve controls the gas flow precisely for efficient heating. A fault can lead to improper operation or system shutdown.
Turn off electrical power at the isolation switch and ensure the gas supply valve is closed immediately. Gas modulating valve issues require professional evaluation due to safety risks. Contact Hilton Plumbing promptly to have the unit safely inspected and repaired.
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Error Code 82 indicates a “Functional Problem on Gas Type Circuit Board” in your Rheem Continuous Flow Water Heater. This fault suggests an internal issue with the circuit board that manages gas type and combustion control.
Immediately switch off electrical power and gas supply at their respective isolation points. Because this error involves sensitive electronic and gas components, professional evaluation and repair are necessary. Contact Hilton Plumbing promptly to arrange a safe and comprehensive repair.
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Error Code 56 on your Rheem Continuous Flow Water Heater indicates a “Bypass Valve Fault.” This fault relates to the internal valve controlling water flow within the unit, affecting normal hot water operation and efficiency.
Immediately turn off the electrical supply at the isolation switch and close all hot water taps. A bypass valve fault requires internal inspection and repairs by a professional technician. Contact Hilton Plumbing promptly to resolve this issue safely.
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Error Code 90 indicates a “Decrease in Fan Motor Ventilation” on your Rheem Continuous Flow Water Heater. This issue signifies reduced airflow, potentially caused by fan malfunction, blockage, or dirt buildup, impacting the heater’s efficiency and safe operation.
Turn off electrical power at the isolation switch immediately. Reduced fan ventilation can pose safety risks due to incomplete combustion. Do not attempt to use the unit until professionally inspected. Contact Hilton Plumbing to arrange an urgent assessment and safe resolution.
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Error Code 61 signifies a “Combustion Fan Fault” on your Rheem Continuous Flow Water Heater. The combustion fan helps remove gases safely and maintain proper airflow. A malfunction affects safety and performance.
For your safety, immediately turn off the electrical supply at the isolation switch and stop using hot water. Combustion fan faults must be handled by trained professionals due to potential hazards. Contact Hilton Plumbing urgently for a safe and thorough inspection and repair.
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Error Code 99 signals a critical issue: “Decrease in Fan Motor Ventilation (Operation Stop). This means the Rheem Continuous Flow Water Heater has detected significantly reduced airflow from the combustion fan, triggering an automatic safety shutdown.
Immediately switch off power at the electrical isolation switch and cease all hot water usage. Error Code 99 involves a critical fan ventilation failure, posing potential safety hazards from improper combustion or exhaust. Contact Hilton Plumbing immediately for professional inspection and urgent repair.
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Error Code 65 on your Rheem Continuous Flow Water Heater indicates a “Water Flow Control Fault.” This fault suggests an issue with the valve or components controlling water flow within the unit, potentially impacting hot water delivery and system performance.
Immediately turn off the electrical supply at the isolation switch and close all hot water taps. Due to the complexity and internal nature of water flow control faults, professional inspection and servicing are essential. Contact Hilton Plumbing promptly to ensure safe and thorough repairs.
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Error Code 66 signifies a problem with the “Water Bypass Valve” inside your Rheem Continuous Flow Water Heater. This valve helps regulate proper water flow and temperature control. A malfunction can lead to inconsistent hot water or shutdown.
Turn off power at the electrical isolation switch immediately and close all hot water taps. Issues involving the water bypass valve require professional intervention to address safely and effectively. Contact Hilton Plumbing to arrange urgent and safe repairs.
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Error Code 31 indicates an “Inlet Thermistor Fault” on your Rheem Continuous Flow Water Heater. This error signifies a problem with the sensor that measures incoming water temperature, essential for proper system operation.
Immediately switch off power at the isolation switch and close any open hot water taps. Because thermistor faults involve electrical components and precise temperature controls, this issue requires professional inspection. Contact Hilton Plumbing to safely diagnose and repair this fault.
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Error Code 32 indicates an “Outlet Thermistor Fault” on your Rheem Continuous Flow Water Heater. This error means the sensor responsible for measuring the outgoing water temperature is faulty or disconnected, affecting proper water temperature regulation.
For your safety, switch off the electrical power at the isolation switch immediately and close any open hot water taps. Because thermistor faults involve electrical components, professional diagnosis and repairs are necessary. Contact Hilton Plumbing promptly to safely resolve this fault.
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Error Code 33 indicates a “Heat Exchanger Thermistor Fault” on your Rheem Continuous Flow Water Heater. This sensor measures the temperature within the heat exchanger and ensures safe, efficient heating. A malfunction can disrupt normal operation.
Immediately isolate power to the unit at the electrical isolation switch and close all hot taps. Given the sensitivity and safety implications of heat exchanger temperature faults, professional intervention is required. Contact Hilton Plumbing for urgent and safe repairs.
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Error Code 34 on your Rheem Continuous Flow Water Heater indicates an “Ambient Air Thermistor Fault.” This sensor monitors air temperature around the unit, and faults can cause inefficient performance or improper heater operation.
Switch off power to the water heater at the isolation switch and close all hot water taps. Due to the electrical nature of thermistor faults and the importance of accurate sensor readings, professional service is necessary. Contact Hilton Plumbing promptly to address this issue safely.
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Error Code 11 on your Rheem Continuous Flow Gas Water Heater (874, 876 Series A12-A26) indicates a failure to ignite, a lack of gas supply, or the appliance failing to detect the flame after ignition attempts. This is a common issue often linked to gas supply problems or ignition system faults.
Firstly, safely check that your gas supply is turned on and gas isolation valves are fully open. If the gas supply is normal, but the issue persists, switch off power to the appliance at the isolation switch, and close all hot water taps. Because Error Code 11 involves gas and ignition components, it’s important to have the unit professionally inspected and serviced. Contact Hilton Plumbing to safely diagnose and resolve this issue.
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Error Code 12 on your Rheem Continuous Flow Gas Water Heater (874, 876 Series A12-A26) means that the unit has ignited successfully but then lost the flame. This usually indicates insufficient gas supply or issues with gas pressure stability.
Ensure your gas isolation valves are fully open and confirm the gas supply is stable and operational. If this doesn’t resolve the issue, immediately switch off power to the water heater at the isolation switch, and close all hot water taps. Due to the nature of gas-related issues and potential safety risks, a professional inspection is essential. Contact Hilton Plumbing to safely address and repair this issue.
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Error Code 03 on your Rheem Continuous Flow Water Heater indicates an EZ Link communication fault. This occurs when there’s a communication failure between two units linked together for increased capacity.
First, turn off the electrical supply at the isolation switch for both units. Wait a few minutes, then switch power back on to see if the error clears. If Error Code 03 persists, professional assistance is required due to the complexity of the internal link communication. Contact Hilton Plumbing for prompt diagnosis and resolution.
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Error Code 05 indicates an “Imperfect Combustion Alarm,” meaning your Rheem Continuous Flow Water Heater is detecting inefficient or incomplete combustion. This could be due to blockages, incorrect gas supply, or burner malfunction.
Immediately turn off the power supply at the isolation switch and ensure the gas supply is shut off. Do not attempt further operation, as improper combustion poses safety risks. Due to potential gas and combustion issues, contact Hilton Plumbing urgently to safely inspect and rectify the fault.
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Error Code 10 signifies “Abnormal Low-rate Combustion,” meaning the unit detects lower than expected combustion levels. This usually points to problems with gas supply, burner contamination, or sensor faults.
Turn off electrical and gas supplies at their respective isolation points immediately. Given the potential risks involving gas and combustion-related issues, this error demands professional evaluation. Contact Hilton Plumbing to ensure your unit is safely and thoroughly inspected and repaired.
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Error Code 16 on your Rheem Continuous Flow Water Heater indicates an “Over Temperature Warning.” This error occurs when water temperature exceeds safe operating limits due to flow restriction or malfunctioning temperature sensors.
Immediately switch off the electrical supply at the isolation switch and cease hot water use. Allow the unit time to cool. This problem requires a professional diagnosis due to safety concerns related to overheating. Contact Hilton Plumbing to ensure safe resolution.
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Error Code 29 indicates a “Heat Exchanger Outlet Temperature Too Low” condition on your Rheem Continuous Flow Water Heater. This issue often arises from sensor faults, insufficient gas supply, or heat exchanger problems.
Turn off power at the isolation switch and close all hot taps immediately. Given the complexity of heat exchanger-related issues, professional evaluation and repairs are necessary. Contact Hilton Plumbing promptly to restore your unit’s functionality safely.
Book online or call us directly at 1300 872 343.
