Noritz error codes
7 codes that Noritz publishes for a tankless water heater, each quoted from the maker’s own manual or support page and explained on its appliance’s page. Pick the appliance, or type the code from the display: only Noritz codes are searched here.
If you smell gas
Stop: do not reset, relight or check anything on this page. Noritz’s own words, from the cover page of the EZ111DV/EZ98DV Owner’s Guide, under “What to do if you smell gas”:
- Do not try to light any appliance.
- Do not touch any electrical switch; do not use any phone in your building.
- Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s instructions.
- If you cannot reach your gas supplier, call the fire department.
Calling from a neighbor’s phone means leaving the building first. Source: EZ111DV / EZ98DV Condensing Tankless Gas Water Heater Owner’s Guide (SBB80T9-1, Rev. 01/17): gas-smell instructions and troubleshooting
Every Noritz appliance we cover
| Appliance | Codes | Source |
|---|---|---|
| Noritz tankless water heater | 7 codes | Noritz, 3 documents |
Noritz tankless water heater error codes
7 codes from Noritz. 3 of them are marked for a licensed professional; for the rest the page gives the checks the maker lets an owner do. Tap a code for its meaning:
Tankless gas water heater: do only the owner checks its manual gives for that code — open the gas and water shut-off valves, check a propane tank has gas, clean a filter the way the manual shows you, clear snow or debris from the vent ends outside, turn it off and on at the controller. Leave gas pressure, the burner, the gas valve, wiring and circuit boards alone. Everything else is for a licensed professional — in the manuals’ words, a qualified installer, service agency or the gas supplier. If you smell gas, do none of the checks: follow the maker’s gas-smell instructions at the top of the page. Two Noritz models can use different codes: your model’s manual is the authority.
Sources
Every Noritz code on this site comes from these pages, published by Noritz and read on the date shown.
- Noritz (tankless water heater): How To Resolve The Seven Most Common Noritz Tankless Error Codes (Noritz blog, 16 November 2015) Checked 2026-09-29.
- Noritz (tankless water heater): Common Noritz Tankless Error Codes: Updated (Noritz blog, 6 June 2022) Checked 2026-09-29.
- Noritz (tankless water heater): EZ111DV / EZ98DV Condensing Tankless Gas Water Heater Owner’s Guide (SBB80T9-1, Rev. 01/17): gas-smell instructions and troubleshooting Checked 2026-09-29.