Noritz

1 field manuals · 7 error codes · 1 guides

Ask about a Noritz
Water Heater

Noritz water heaters

Manual · Water Heater

Gas tankless water heater: field service manual (water side and diagnostics)

Residential non-condensing and condensing gas tankless units with digital controllers

5 components3 common failuresRinnai, Navien, Noritz, Rheem, A.O. Smith, Bradford White

Error codes

10 Combustion / exhaust problem11 Ignition failure12 Flame loss / weak flame16 Outlet temperature spike (often …29 Condensate drain problem73 Circuit board setting error90 Combustion abnormality
Guide · Water Heater

Tankless: error code, no ignition at low flow, or temperature swings

Many tankless complaints are water-side: flow below the activation threshold, a clogged inlet screen, low-flow aerators, or scale in the heat exchanger. Gas supply, venting and combustion codes are blocked: diagnose and refer. Read the code first, then work the water side.

6 steps ~90 minmoderate

Official Noritz manuals & support

Brand names identify appliances only. OnCall Tech is not affiliated with or endorsed by Noritz.