Noritz Tankless Water Heater Troubleshooting – Guide You Want to know 2022

Noritz tankless water heaters exhibit numerical codes on the display screen when something is wrong.

Interpreting these codes and fixing them correctly is extremely important. Therefore, we are going to cover you today.

We know how infuriating it is when your heater suddenly stops working and shows a random code that you have never seen earlier. We are here to make things clear for you.

We will first enlighten you about how to take proper care of your unit and then discuss the common Noritz combi boiler error codes and how to fix them without employing professional service.

Knowing how to do Noritz tankless water heater troubleshooting can help you save a lot of time and money. So let’s take a look at Noritz error codes, what they mean, and how to solve them.  

How To Take Proper Care Of The Noritz Heater?

To keep your device in tip-top condition, you should purge the port valves by connecting hose lines and opening the relevant purge port valves.

If you are fully ready and have a safe ejection area, it should be an easy procedure and eliminate waste from your machine.

On the flip side, you can also take advantage of pure white vinegar to clean out the water now that you have purged its lines.

The manufacturer recommends various draining and flushing methods, so make sure to follow them when cleaning out your appliance.

No matter which method you choose, avoid using punitive chemicals during the cleaning procedure because they will lead to destruction.

After completing the cleaning process, turn your unit on again. Do it slowly to get rid of any trapped air from the heater.

Do it by locating a tap furthest away from the unit and activating it slowly to remove the air safely.

Error Codes And Noritz Tankless Water Heater Troubleshooting

No Error Code

Sometimes the device does not function properly, but no numerical code is shown. It happens due to these problems:

• If the display does not exhibit the preset temperature when the unit is running, confirm that the power voltage, circuit boards, and remote controller readings are according to the specifications. Also, examine the fuse and wirings of the unit.
• If the fan does not operate when the warm water valve is opened, it means a water flow sensor is damaged, or the cold water thermistor detection is not functioning appropriately or set extremely high.
• If the outlet water temperature is wrong, ensure the heat exchangers and hot and cold water thermistors are working correctly.  

Error Code 05

Problem: It means the time has come for the appliance to be serviced by a professional technician.

Solution

Error Code 10

Problem: If the power has dropped or gas combustion is still occurring even after the heater has been shut off.

Solution

Error Code 11

Problem: Ignition has failed in your appliance.

Solution

Error Code 12

Problem: This error code indicates that the burner flame is extremely low and insufficient to heat the device, or the flame rod does not sense a flame.

Solution

Error Code 14

Problem: This code tells you about the problem with the thermal fuse. It shows up due to the poor water quality and limited airflow. 

Solution

Error Code 16

Problem: It specifies that the water temperature is extremely high.

Solution

Error Code 20

Problem: It appears when the high limit switch has been turned on.

Solution

Error Code 29

Problem: When these troubleshooting codes show up, the water level has surpassed the correct level because the water level neutralizer is not draining properly. 

Solution

Error Code 31

Problem: When this code displays on the screen, it means something is wrong with the inlet thermistor.

Solution

Error Code 32

Problem: The outlet pipe’s warm water thermistor has broken down.

Solution

Error Code 33

Problem: The heat exchanger thermistor has failed.

Solution

Error Code 45

Problem: There is a water leakage issue.

Solution

Error Code 59

Problem: This code informs you about the low input BTU and combustion issues.

Solution

Error Code 61

Problem: It enlightens you about the failure of the fan motor.

Solution

Error Code 65

Problem: It shows up when the main flow control valve has failed.

Solution

Error Code 66

Problem: There is an issue with the bypass flow control valve.

Solution

Error Code 67

Problem: It tells you about the faulty air-gas mixer.

Solution

Error Code 70

Problem: It means the circuit board has malfunctioned.

Solution

Error Code 71

Problem: The gas valve drive circuit is defective.

Solution

Error Code 72

Problem: It indicates that the flame rod senses the fire without the ignition categorization.

Solution

Error Code 73

Problem: The circuit board settings are incorrect. If you have replaced the dip switch or changed a jumper connection while the power was distributed to the device, this problem can occur. An incorrectly programmed circuit board can also trigger this issue.

Solution

Error Code F76

Problem: It means there is miscommunication between your heaters (if you have more than one) that are linked with a quick connect cord. More than one remotes connected to the devices can instigate this issue.

Solution

Error Code 760

Problem: It informs you about the remote control problem.

Solution

Error Code 90 And 91

Problem: The gas combustion is abnormal.

Solution

Error Code 92 And 93

Problem: Neutralizer has reached the end of its lifespan.

Solution