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WCohn
WCohn, Journeyman Plumber
Category: Plumbing
Satisfied Customers: 825
Experience:  Journeyman Plumber/Estimator
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Our tankless w/h model # nr981 keeps going off flashing a

Customer Question

Our tankless w/h model # nr981 keeps going off flashing a code of 91. We have been able to get it to come back on by powering down the Electricity to the house and reset it. The unit is less than 2 years old. We purchased it from Coburns Supply in Lake Charles, LA. Can you help us?
JA: Did you double-check the thermostat? And what about the unit's filters?
Customer: The thermostat has been set at 120 degrees since we installed it.
JA: Do you plan on doing the work yourself?
Customer: Yes if we can get help from you as to what to do.
JA: Anything else we should know to help you best?
Customer: This has happened at least 2 to 3 other times and we could get it to come back on by powering down everything the breaker box. This time it has not helped. It comes on but when we run the hot water for more than 3 - 4 minutes it goes back to the code 91.
Submitted: 3 months ago.
Category: Plumbing
Expert:  WCohn replied 3 months ago.

My name is ***** ***** I look forward to helping you!

Expert:  WCohn replied 3 months ago.

I am a factory trained and certified Noritz repair technician.

Expert:  WCohn replied 3 months ago.

This error code is very rare. It is for improper gas type. I assume since it has worked in the past that it is the right gas type???

Expert:  WCohn replied 3 months ago.

You can rate me here as well