Http://www.noritz.com/u/pages_from_field_manual_2010_12_09_pdf__adobe_acrobat_professional.pdf
The Noritz field manual says that error code 66 is Bypass Water Control Valve failure. Call support at 866-766-7489 with your model #, serial # (both on the unit face plate), date of purchase, to see if the valve can be replaced under warranty.
SOURCE: Noritz Tankless error code 16
The trick with these hot water heaters is to keep the filter screen clean and flush the system with CLR periodically. Code 11 is ignition error. Is your gas valve turned on?
SOURCE: getting error code 16. what does it mean and what
a 16 error code is typically caused by scale formation. I'd recommend performing a descale on the heater.
SOURCE: error code 14 shows on the remote for a noritz
This means the thermal fuse has broken and needs replacement. The thermal fuse is a white cord which wraps around the heat exchanger. It typically breaks if the unit is excessively dirty and sooted. Before the fuse is replaced you should make sure the unit is cleaned with compressed air and descaled.
SOURCE: after freezing weather the Noritz N-0751M-OD
I believe you killed it,I've installed two units direct vented through side wall in Minnesota and the cold wind blew in flu and froze up units,water stopped running in houses so we were able to save
SOURCE: Can we change the orfice
There's a field conversion kit available. Contact Noritz to get more information.
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