Despite Noritz’s commitment to the highest quality water heaters, there are times when your unit will display an error code. These codes can detect faults before they cause a unit to fail, reducing the need for repairs. In some cases, the error codes’ meaning may be unclear. So, we’ve compiled the solutions to the most common Noritz error code 11.
This article answers the question of what the Noritz error code 11 means, and what to do when you see the error code displayed on the panel. See how you can easily fix the Noritz error code 11.
What is Noritz Error Code 11?
Error code 11 on Noritz indicates a problem with your tankless water heater’s ignition. This indicates that your system is failing to heat water, which is often caused by insufficient gas flow, low airflow, or a dirty ignition plug.
The maximum and minimum inlet gas pressures depend on the max BTU input and gas type of the unit. Thanks to the rating plate on the unit, you don’t even have to memorize the maximum and minimum inlet gas pressures chart.
How to Fix Noritz Tankless Water Heater Error Code 11
Check Inlet Gas Pressure
Requirements: If you want to check the pressure of the inlet gas, then you will need a Philips Screwdriver and a Digital Gas Manometer.
Note: It’s best to have a professional do the following steps since they involve gas and require working inside the unit.
Close the gas valve under the unit. (Use only your hand to turn off/on the gas valve knob. Never use tools)
You will need to remove the screw from the inlet test port and be careful not to lose it.
Connect the hose from the manometer by inserting it into the port and opening up the gas valve.
Static gas pressure will be displayed on your manometer. It represents the pressure at no gas operation.
In this step, you will check the dynamic pressure, which is the gas pressure during gas usage.
Note: When you attach your manometer, some pressure may appear, which is perfectly okay. Make sure not to zero it out after the attachment.
The static and dynamic pressures of the gas should always be greater than the minimum requirements of the unit.
Either the static or dynamic inlet gas pressures are not within the minimum requirements of the unit, check that the length and diameter of the gas lines comply with the installation manual guidelines.
You should also ensure that the gas meter or the gas regulator is capable of handling the total BTU load of all gas appliances in the home. In addition, look for tripped earthquake safety shutoffs for California installations.
Clean Ignition Rod
Requirements: Cleaning the ignition rod requires a Phillips Screwdriver and a tool for cleaning the ignition rod.
The screws securing the ignition rod need to be removed. Remove the screws and make sure the gasket is not damaged in the process.
Use fine-grit sandpaper to clean the ignition rod.
Afterward, reconnect any disconnected wires after cleaning.
You can verify that ignition has occurred by running a hot water faucet and checking the burner window to see if there is a flame.
Troubleshoot Noritz Error Code 11
Locate the gas valve attached to the Noritz water heater and rotate it counterclockwise until it does not turn anymore.
Press the “Power” button on the unit to turn it off. Open a nearby faucet and run hot water.
For the water heater to function again, wait 5 minutes after pressing the “Power” button.
The hot water should be turned off now. The problem should now be resolved.
Frequently Asked Questions (FAQs)
How do I fix Noritz Error 11?
Make sure you check the inlet gas pressure or that the ignition rod is clean. If you are still facing the same error then call a licensed Noritz contractor. Your mechanic will make sure the gas valve is open, the exhaust vents are clear, and the ignition plug is clean and firmly attached.
What is code 11 on a tankless water heater?
When Noritz Error Code 11 appears on your electronic control panel, it indicates that your tankless water heater has an ignition failure.
Where is the reset button on a Noritz tankless water heater?
Locate the water heater circuit on the electric panel. Locate the reset button under the insulation behind the panel cover. Press it into place until it clicks in, then releases it. Put the cover back on. The gas valve should be connected if it was disconnected. If you cant find Noritz tankless water heater reset button, simply read the instructions in the manual.
Why reset a Noritz tankless water heater?
Resetting your Noritz tankless water heater will help if nothing else does. When the reset is done, it usually fixes the Noritz error codes like 11 or temporarily fixes the water heater problem. When you reset it, the water heater will be in the same condition it was when first purchased.
How to contact Noritz support?
You can contact Noritz product and technical support at 866-766-7489
In most cases, Noritz Error Code 11 is caused by a failed ignition. We hope that this article on Noritz error code 11 helped you to resolve this issue. However, if the Noritz code 11 problem continues then we recommend contacting a qualified service technician for any necessary repairs, service, or maintenance.