Licensed, Red Seal technicians — same-day response across Metro Vancouver. Call (604) 359-1081 or request a free quote.
Tell us what you need—we’ll call you back fast.
Common Noritz fault codes with what each means, the likely cause, and what CANRO Heating & Cooling does to fix them. Servicing Noritz systems across Metro Vancouver since 1999.
Noritz EZ, NRC, and EcoTough tankless water heaters display numeric error codes on the front-panel LCD. Common Metro Vancouver Noritz codes:
Important: One reset attempt is generally safe for transient faults. If the same code returns within minutes, stop resetting — the lockout exists to protect the heat exchanger, ignition system, and gas-valve safety circuit. Note the exact code and call CANRO at (604) 359-1081. We carry common Noritz parts in every truck — most code-triggered faults are resolved in a single visit.
What it means: Combustion air or vent obstruction.
Common causes: Vent terminal blockage, condensate ice.
What to do: Inspect vent; call.
Reset guidance: no
What it means: Burner failed to light.
Common causes: Gas, flame rod, ignitor.
What to do: Standard service.
Reset guidance: one reset OK
What it means: Flame extinguished.
Common causes: Same as 11.
What to do: Service.
Reset guidance: one reset OK
What it means: Internal high-limit.
Common causes: Scaling, low flow.
What to do: Descale.
Reset guidance: no
What it means: DHW side over-temp.
Common causes: Scaling.
What to do: Descale.
Reset guidance: one reset OK
What it means: Condensate not draining.
Common causes: Trap, frozen line.
What to do: Trap service.
Reset guidance: no
What it means: Outlet temperature sensor.
Common causes: Failed sensor.
What to do: Swap.
Reset guidance: one reset OK
What it means: Inlet temperature sensor.
Common causes: Failed sensor.
What to do: Swap.
Reset guidance: one reset OK
What it means: Gas valve.
Common causes: Valve fault.
What to do: Replacement.
Reset guidance: no
What it means: Modulating valve.
Common causes: Valve fault.
What to do: Service.
Reset guidance: no
What it means: Combustion fan.
Common causes: Failed fan.
What to do: Service.
Reset guidance: no
What it means: Internal valve (combi).
Common causes: Valve fault.
What to do: Service.
Reset guidance: one reset OK
What it means: Three-way valve.
Common causes: Valve fault.
What to do: Service.
Reset guidance: one reset OK
What it means: Gas valve signal.
Common causes: Wiring or valve.
What to do: Service.
Reset guidance: no
What it means: Flame rod sensing.
Common causes: Dirty rod.
What to do: Clean.
Reset guidance: one reset OK
What it means: APS fault.
Common causes: Vent or switch.
What to do: Inspect.
Reset guidance: no
What it means: Display-to-control comm.
Common causes: Cable or board.
What to do: Service.
Reset guidance: no
What it means: Manual reset high-limit.
Common causes: Overheating event.
What to do: Call CANRO.
Reset guidance: no
What it means: Recirculation pump fault.
Common causes: Pump failure.
What to do: Pump service.
Reset guidance: one reset OK
What it means: Combustion calibration drift.
Common causes: Combustion service.
What to do: Full analysis.
Reset guidance: no
What it means: Annual descale reminder.
Common causes: Time-based.
What to do: Schedule service.
Reset guidance: clear after service
Note the exact code on your display, then call CANRO. Most Noritz faults are diagnosed and repaired on the first visit because we stock common Noritz service parts in every truck.
📞 Call (604) 359-1081 nowCANRO services Noritz tankless water heaters in every Metro Vancouver city — including same-day emergency response for no-heat, no-hot-water, and gas-leak situations. See our city-specific Noritz pages:
→ See the full Noritz lineup hub page with every model, specs, and install costs
This Noritz error code guide is maintained by the CANRO Heating & Cooling team based on 25+ years of Noritz install, service, and repair experience across Metro Vancouver. Codes and behaviour described match current model manuals. Last reviewed May 2026.
“Canro does an amazing job! Super professional and skilled with everything—boilers, furnaces, and AC. Always a pleasure working with them!”
“Five stars for Canro. We needed a replacement of a 30-year-old boiler. A new high-efficiency unit was installed—clean, professional work.”
“I can’t speak highly enough about George, who was recommended for a boiler service call for my parents’ home. George is excellent.”
25+ years keeping Metro Vancouver homes comfortable. Honest advice, upfront pricing, work that lasts.