How To Troubleshoot Noritz Tankless Water Heaters - What To Do When You Get The Error 90 Code

Sometimes Noritz tankless water heaters show error code 90.  Here's what you can do if that happens to you.

Sometimes Noritz tankless water heaters show error code 90. Here's what you can do if that happens to you.

Some Homeowners Run Into The Error 90 Code When They Run Their Noritz Tankless Water Heaters For A While


Error 90 indicates you may have a ventilation issue caused by dust, lint, etc building up and choking the flow of cool air to the unit which causes the burner to overheat.


How To Resolve The Code 90 Error


Code 90, however is a minor problem and can be resolved easily. To resolve the code 90 error, you should remove the front panel and blow out the intake holes and slots. Unscrew to blow the fan out and blow out everything inside the unit and reassemble it.


The Error 90 Can Also Show If You Have An Exhaust Problem.


The main reason for this problem is malfunctioning of the flapper valve on the outlet of the system.



  • This valve would be seen stuck closed which could be fixed easily.

  • Another reason is the obstruction in the exhaust ducting or using a duct of very small diameter, which should be replaced.


By Doing The Simple Techniques Above You Can Expect Your Noritz Tankless Hot Water Heater To Run With Ease


Many people choose to invest in the Noritz brand because they are relatively trouble-free and easy to run. If you know the simple techniques highlighted above, Noritz water heaters will last longer and trouble free.


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