Noritz Burner Not Turning On

Noritz Burner Not Turning On [3 Easy Solutions]

The Noritz burner is not turning on because of insufficient gas supply, loose or dirty ignition plug, and dirty burner. 

Throughout this guide, I will describe every troubleshooting step you need to follow to fix those issues. 

So, keep reading to discover the solutions and turn on the burner successfully. 

Table of Contents

Why Is My Noritz Burner Not Turning On? [3 Easy Solutions]

Here are the three main culprits that prevent your Noritz Tankless Water Heater burner from turning on: 

1. Insufficient or No Gas Is Flowing To The Burner

You can never ignite the burner if no gas is flowing to the unit. Generally, the burner will not receive any gas if you don’t open the gas valve on the unit.  Turns out, size up the gas meter improperly for the water heater can cause the burner to not come on. 

On the other hand, if you have a propane operated Noritz Water Heater, I bet there is not sufficient gas in the propane tank. 

Nonetheless, sizing up the gas lines improperly or feeding the unit with improper gas type can prevent the burner from turning on. 

How To Fix: 

Begin with checking the position of the gas valve. Ensure you turn it on. If not, just turn the gas valve counterclockwise to let the gas flow freely. 

Secondly, verify you size up the gas meter properly for the unit and other gas appliances so that it meets the total BTUs demand for every appliance in the building. 

Thirdly, make sure you feed the water heater with the proper type of gas. If it’s a propane operated unit, fuel it up with propane. 

And finally, check the gas line and ensure you size it up appropriately. 

2. Loose or Dirty Ignition Plug

Ignition plug comes loose or it gets dirty is what I blame next if the burner doesn’t come on. Over time, the ignition plug gets coated with carbon deposits. As a result, it prevents the burner from igniting. 

How To Fix: 

To fix the burner issue, inspect the ignition plug for loose connection. Follow the below steps to learn how to check this internal component. 

Start with turning off both the electric supply and gas supply to the water heater.

Next, Unscrew the front cover of the unit and set it aside. Don’t forget to keep the screws in a safe place for easy finding. 

Afterward, detach the white connectors attached to the flame rod and ignition plug. 

Now, use a Phillips head screwdriver to remove the screws on the sides. Never use a power tool to remove those screws. Otherwise, it will strip the screws. 

Once you unscrew the nuts on the sides, remove the flame rod and sensor carefully. You must take extra precautions as the gasket is extremely fragile. 

Now, use a 100-grit sandpaper to clean carbon deposits both from the flame sensing rod and ignition plug. 

After cleaning the ignition plug and sensor, replace it into its place, install the gasket, and secure it with nuts. 

Now, attach the white connectors to the flame sensing rod and ignition plug snugly. Make sure the connectors are secure and tight. 

3. Dirty Burner

If the burner gets dirty by dirt, debris, fuel residue, you can’t ignite the burner. Now, the question you may ask is- how can I understand the burner is filthy? 


Inspect the burner flame through the view-port. If the burner flame seems inconsistent or yellow, I bet the burner gets dirty. 

In this case, you must clean the burner if you want it to turn on again. Fortunately, I wrote a guide on Noritz Tankless Water Heater Maintenance. In that guide, I described how to clean the burner step-by-step. So, it’s worth reading the article. 

How To Light Up A Noritz Tankless Water Heater?

Lighting up the tankless water heater correctly is highly recommended. It is required if you run the unit for the first time or are going to turn on the unit after performing maintenance. 

Follow the below lighting instructions step-by-step to light up the Noritz Water Heater: 

  • Read the safety information on the front of the unit at a glance.
  • Disconnect the water heater from the electric outlet or turn off the electric supply at the circuit breaker. 
  • Never try to light the burner by hand. 
  • Turn the gas control valve clockwise to shut off the gas supply to the unit. 
  • Wait five minutes to let the gas clear out. 
  • Set the gas valve to the on position by turning it counterclockwise. 
  • Restore electric power to your water heater. 
  • The unit will now come on whenever the hot water is called for. 


Why is my tankless water heater not turning on?

Generally, your tankless water heater is not turning on in the wake of: 

  • Too low water flow rate
  • Not enough electric supply
  • Gas supply issue 
  • The circuit breaker gets tripped
  • A clogged exhaust vent 

If you encounter this issue with your Noritz Water Heater, I recommend you read this article to fix those problems. 

How do I reset my Noritz tankless water heater?

Just unplug the water heater from the electric outlet. Wait for 3o seconds and restore the power to the unit. It will reset your Noritz Tankless Unit. 

Is there a reset button on a Noritz tankless water heater?

No, the Noritz Tankless Water Heater doesn’t have a reset button. 

How long do Noritz water heaters last?

Noritz water heater will serve you up to 20 years if you maintain it according to the manufacturer guideline. 


Spending a ice-cold day of winter without a functioning water heater is like a suicide attempt. 

If you want to enjoy the comfort of hot water, you must figure out the reasons that cause the burner of the Noritz Tankless Unit to not turn on. Luckily, I broke down each culprit behind this issue. 

So, follow the troubleshooting tips I gave and get a functional unit to get comfortable hot water. 

Read Also:

Similar Posts

Leave a Reply

Your email address will not be published. Required fields are marked *