Noritz Tankless Water Heater Error Codes: Complete Diagnostic List
23 diagnostic codes documented · Official site ↗
🟡 Warning — Schedule Service
Flame Failure
The Noritz 10 error code indicates that your water heater's flame has gone out. This could be due to a few reasons, but it's crucial to address it promptly to prevent further issues. The system is designed to shut down as a safety precaution when it detects this problem.
Ignition Failure
The Noritz 11 error code indicates that your water heater's ignition system is not functioning properly. This could be due to a faulty ignition control board, a bad spark igniter, or a problem with the gas valve. The system is designed to protect itself from potential hazards, so it's safe to use, but you'll need to call a professional to fix the issue.
Flame Loss
Error code 12 on your Noritz water heater indicates a flame loss issue. This means that the burner is not igniting or maintaining a flame, which could be due to a few reasons. The most common causes are a faulty igniter, a problem with the gas valve, or an issue with the thermocouple. It's important to note that this error can also be caused by a lack of gas supply or a clogged burner.
Thermal Fuse Failure
The Noritz 14 error code indicates a failure of the thermal fuse in your water heater. The thermal fuse is a safety device that trips when the temperature exceeds a certain level, preventing overheating. When it fails, it stops the heating process, and your water heater won't produce hot water. This issue is common in Noritz water heaters due to their high-quality construction and safety features.
Over-Temperature
The Noritz 16 error code indicates that the water temperature has exceeded the set limit. This could be due to a faulty temperature sensor or a problem with the control board. The heater is still safe to use, but it's important to have it checked by a professional to prevent any potential damage or safety hazards.
Condensate Drain Issue
Error code 29 on your Noritz water heater indicates that the condensate drain line is blocked or not functioning properly. This could be due to a buildup of minerals, debris, or even mold and mildew. When the drain line is blocked, water heater operation may be compromised, leading to potential water damage and system lockout.
Inlet Thermistor Failure
The Noritz 31 error code indicates a failure in the inlet thermistor, a crucial temperature sensor in your water heater. This component helps maintain the correct water temperature. Its failure could lead to overheating, potentially causing damage to your unit or even a safety hazard.
Outlet Thermistor Failure
Error 32 on your Noritz water heater indicates a failure in the outlet thermistor, a crucial temperature sensor. This sensor ensures your water heater operates safely and efficiently. When it fails, your heater can't accurately measure the water temperature, leading to a system lockout to prevent overheating or underheating.
Heat Exchanger Thermistor Failure
The error code 33 on your Noritz water heater indicates a failure in the heat exchanger thermistor. This component measures the temperature of the heat exchanger and sends this information to the control board. When it fails, the system locks out to prevent overheating and potential damage. This is a common issue in Noritz water heaters and is typically caused by normal wear and tear or exposure to hard water.
Water Level/Neutralizer Issue
Error code 43 on your Noritz water heater indicates a problem with the water level or neutralizer. The neutralizer is a component that maintains the water's pH balance, preventing corrosion. If this system isn't working correctly, it could lead to premature equipment failure. The water level sensor ensures your heater has enough water to operate safely and efficiently.
Water Leak Detected
When you see error code 45 on your Noritz tankless water heater, it means the unit has detected a water leak somewhere in the system. This could be due to a loose connection, a cracked pipe, or a faulty component. The heater has safely shut down to prevent further water damage. While it's still safe to use, it's important to have a professional inspect and repair the issue as soon as possible.
Fan Motor Failure
The Noritz 51 error code indicates that the fan motor in your condensing tankless water heater has stopped working. This motor is responsible for drawing combustion air into the unit and exhausting the byproducts of combustion out. When it fails, the system automatically shuts down to prevent any potential safety hazards. This error is not typically caused by a simple power issue; it's usually due to a faulty motor or a problem with the motor's control circuit.
Exhaust Blockage
Error code 52 on your Noritz water heater indicates that the exhaust system is blocked, preventing proper venting. This could be due to a buildup of lint, dust, or other debris. The unit has automatically shut down to ensure safety. Do not attempt to operate the unit until the issue is resolved by a professional.
Overheating Abnormality
Error code 59 on your Noritz water heater indicates an overheating condition. This could be due to a faulty temperature sensor or a problem with the heating element. While the unit is still functional, it's important to address this issue to prevent further damage or safety risks. Keep using your water heater, but monitor it closely.
Fan Motor Failure
The error code 61 on your Noritz water heater indicates a fan motor failure. The fan motor is responsible for circulating air over the heat exchanger to maintain safe operating temperatures. When the fan motor fails, the system automatically shuts down to prevent overheating and potential safety hazards. This error is common in Noritz water heaters due to their high-quality, long-lasting components, but eventually, wear and tear can cause the motor to fail.
Main Flow Control Valve Abnormality
The Noritz 65 error code indicates an abnormality with the main flow control valve in your tankless water heater. This valve regulates the flow of water through the system. When it's not working properly, your water heater may not function as efficiently as it should. The error code is displayed on the control panel, and the unit will operate at a reduced capacity until the issue is resolved.
Bypass Flow Control Valve Failure
Error code 66 on your Noritz water heater indicates a failure in the bypass flow control valve. This valve is responsible for regulating water flow through the heat exchanger. If it fails, it can cause the water heater to overheat, posing a safety risk. The water heater will shut down to prevent any potential hazards.
Circuit Board Fault
The Noritz 70 error code indicates a fault with the circuit board, which controls the water heater's operation. This could be due to a short circuit, open circuit, or other electrical issue. The heater will display this error and shut down to protect itself and your home from potential damage. While it's safe to troubleshoot, it's important to know what you're doing to avoid causing further issues or injury.
Gas Valve Drive Circuit Abnormality
Error code 71 on your Noritz water heater indicates a problem with the gas valve drive circuit. This circuit controls the gas valve that supplies fuel to the burner. When an abnormality is detected, the unit locks out to ensure safety. Common causes include electrical issues, such as a short circuit or open wire, or problems with the gas valve itself. Don't attempt to fix this issue yourself; always call a licensed technician.
Flame Rod/Gas Valve Issue
Noritz error code 72 indicates a problem with either the flame rod or gas valve in your water heater. The flame rod detects the presence of a flame, while the gas valve controls the flow of gas. When either of these components fails, your water heater will shut down to prevent a potential gas leak or fire hazard. This error is common in Noritz water heaters, especially in models with electronic ignition.
Circuit Board Setting Error
The Noritz 73 error code indicates a problem with the circuit board's settings. This could be due to a software glitch, a power surge, or a faulty component. The unit has entered a safe mode and shut down to prevent further damage. Before you call a professional, let's try a simple reset.
Combustion Abnormality
Error code 90 on your Noritz water heater indicates a combustion abnormality. This could be due to improper gas supply, a faulty ignition system, or a problem with the burner itself. The unit has safely shut down to prevent further issues. While it's still safe to use, it's important to have a professional diagnose and fix the problem to ensure your water heater is working efficiently and safely.
Neutralizer Life Cycle Alert
Error code 92 on your Noritz water heater indicates that the neutralizer's life cycle is complete. The neutralizer is a crucial component that helps maintain the water's pH balance, preventing scale buildup and prolonging the lifespan of your heater. When this error appears, it's time to replace the neutralizer to ensure optimal performance and prevent system lockouts.