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Noritz N-084 - Water heater cutting off - error code 90

My Noritz N-084 ng water heater is cutting off during showers, displaying error code 90 (Combustion abnormality) on the controller. This initially occurred once every three-four months but now occurs almost daily. Facts: - I've owned the home approximately 18 months. - The unit was manufactured 04/06 and installed about 6 months later. - The installation includes a recirculation system with Grundfos pump and timer. - The unit is near the gas meter with approximately 3 feet of 3/4" pipe going into a 2" pipe. - No increase in incidents when running furnace, 30,000 btu fireplace, or cook top. - The exhaust flue is approximately 30" long exiting outside wall. - Housing, fan, and flue free of dust and debris. - I thoroughly descaled the unit with 3:1 water/CLR solution. - After descaling the filter slipped right out for cleaning. - Initially had controller temp set at 125 degrees, currently at 115. - The unit occasionally fails during steady reheating of the recirculation loop. - If I catch it immediately I can turn the controller off and back on and it will resume. If I don't catch it immediately I often have to cut the power to turn off the controller and reset.

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Posted on Jan 02, 2017

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I have a Noritz tankless water heater (model n-132m). I am getting an error code of 71. What does that mean?


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Error Code 90 Solution


Over time after about 5 to 6 years many Noritz heaters tend to display error code 90 and stop working. The unit has to be shut off and back on for it to work again for a short time. Error code 90 is indication of abnormal combustion and can have a few causes, including blockage in the exhaust vent. However the problems lies mostly with the combustion fan. that is the fan that you hear when the unit is running. It is unable to deliver enough air to normal combustion.
Replace the fan and while doing it clean the air pathway with compressed air. In addition remove the ignition and heat senors (all in one assembly, in the middle of the unit) and sand them very slightly with very fine sandpaper (400 or higher) to remove build up on them.
While the fan is being ordered you can at your own risk operate the unit with the cover slightly open (about 2 in.) at the bottom and the unit will run without code 90. It is highly recommended to hire a trained technician for the above work as gas appliances pose a significant danger to human life and property if not installed or maintained properly. This solution is for informational purposes only. Please be safe.
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http://waterheatertimer.org/Crossover.html

Exposing tankless to hard water causes reduced efficiency within a few months, and can cause Total failure of parts within two years.
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http://waterheatertimer.org/pdf/Battelle_Final_Report.pdf

To possibly solve problem temporarily, install softening system, delime tankless unit using white vinegar. Delime yearly. It is fun for whole family. And who doesn't like a project schedule.
http://waterheatertimer.org/pdf/Rheem-De-lime-tankless.pdf

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