Noritz Water Heater Error Codes — Meanings, Causes & Repair in Greater Vancouver

Seeing a fault code on your Noritz water heater? This guide explains what the most common Noritz water heater error codes mean, what’s safe to check yourself, and when to call HeatLand’s licensed, TSBC-certified gas technicians for Noritz water heater repair across Metro Vancouver and the Fraser Valley.

The codes below apply across common Noritz models (NRC, NRCP, EZ). Meanings follow Noritz’s documented fault codes — always confirm against your unit’s own manual, because exact wording can vary by model, control board and firmware.

How to read Noritz water heater error codes

1-3 digit numeric code shown on the remote controller (e.g. 11, 16, 29, 90); some appear with an 'F' prefix or as a flashing code. Older non-condensing models can map the same number to a slightly different fault, so always confirm against the manual for the specific model.

Noritz water heater error codes & what they mean

These are the Noritz water heater codes our Greater Vancouver technicians see most. Anything marked pro repair involves gas, electrical, sealed-combustion or control-board work that must be done by a licensed gas technician (TSBC-certified in BC) — never open gas or electrical components yourself.

Code	What it usually means	Common causes	Safe to check yourself
10	Combustion abnormality / BTU (input) drop. The unit detects reduced combustion output but keeps running. Effectively a soft warning of insufficient firing pro repair	Insufficient gas supply or pressure; Partial venting/air-intake restriction; Dirty or debris-loaded burner, fan, or heat exchanger over time	Confirm gas is on and other gas appliances run normally; Confirm the air intake and exhaust vent terminations outside are clear of snow, leaves, or debris; Perform a single power reset (off/on) if the manual allows
11	Ignition failure – the unit failed to detect a flame at ignition (no successful light-off) pro repair	No/insufficient gas (empty propane tank, gas valve closed, low pressure); Air or restriction in the gas line; Airflow / vent blockage	Confirm the gas supply is on and another gas appliance lights normally; For propane, confirm the tank is not empty; Confirm the intake and exhaust vent terminations outside are clear
12	Flame loss – the burner lit but the flame went out (could not stay lit) during operation pro repair	Low propane tank volume or undersized gas supply; Poor / dropping gas pressure that weakens the flame; Vent or air-supply disturbance	Confirm the gas supply is on and other gas appliances run without sputtering; For propane, confirm the tank level is adequate; Confirm vent terminations are clear
14	Thermal fuse failure / overheat-prevention device (thermal fuse around the heat exchanger) has triggered due to an overheat condition pro repair	Heat exchanger overheating; Scale buildup in the heat exchanger restricting flow; Blocked or restricted water flow	Confirm the water supply to the unit is fully on and not throttled; Perform a single power reset to see if the fault clears
16	Abnormally high outlet water temperature – the outlet temperature spiked to an unsafe/scalding level, so the unit shut the burner down pro repair	Scale buildup in the heat exchanger; Low/insufficient water flow; Clogged inlet water filter screen	Confirm the cold-water supply valve to the unit is fully open; Check the inlet water filter screen for debris and clean it per the owner manual if you are comfortable doing so; Perform a single power reset
20	High-limit switch triggered (over-temperature safety). On some condensing models also associated with a clogged condensate container pro repair	Overheat condition; Scale buildup / restricted flow; Clogged inlet filter screen	Confirm the water supply is fully on; Clean the inlet water filter screen per the owner manual if comfortable; Perform a single power reset
29	Condensate drainage problem – condensate collector / neutralizer high water level. The unit cannot drain condensate, so it stops the burner to avoid flooding it. Condensing models only pro repair	Blocked condensate drain line; Clogged neutralizer; Incorrectly piped drain line (upward slope, trapped, or wrong size)	Look for an obviously kinked, frozen, or blocked external condensate drain line; Perform a single power reset after any obvious external blockage is cleared
31	Thermistor – cold water (inlet) abnormality. The inlet water temperature sensor reads out of range, open, or shorted pro repair	Loose or damaged thermistor connection / wire harness; Failed inlet thermistor	Perform a single power reset to see if it was a transient fault
32	Thermistor – hot water (outlet) abnormality. The outlet water temperature sensor reads out of range, open, or shorted pro repair	Loose or damaged thermistor connection / wire harness; Failed outlet thermistor	Perform a single power reset to see if it was a transient fault
33	Thermistor – heat exchanger outlet abnormality. The heat-exchanger temperature sensor reads out of range, open, or shorted pro repair	Loose or damaged thermistor connection / wire harness; Failed heat exchanger thermistor	Perform a single power reset to see if it was a transient fault
45	Water leak detected inside the unit (moisture/water sensed internally). Noted for NRCP and CB (Pro Series / premix) models pro repair	Internal water leak; Condensation/moisture intrusion inside the cabinet	Look for visible water pooling under or around the outside of the unit; Shut off the water supply and contact a licensed technician if a leak is visible
51	Gas solenoid valve failure (failure of the gas solenoid valve other than its drive circuit) pro repair	Faulty gas solenoid valve; Damaged or loose gas solenoid valve connection / wiring	Perform a single power reset; if the code returns, stop and call a technician
61	Fan (combustion blower) motor abnormality – the fan is not spinning, or spinning much faster/slower than the expected RPM for the current stage pro repair	Failed or obstructed fan motor; Loose fan wiring / wire harness; Temporary vent blockage (wind gusts, obstruction)	Confirm the intake and exhaust vent terminations outside are clear; Perform a single power reset; an EC61 that only shows in history may have been a transient vent/voltage event
65	Main water control servo abnormality (main flow-control valve). On non-Pro models stated as a heat-exchanger flow control valve abnormality pro repair	Failed, stuck, or debris-fouled main water servo / flow control valve; Loose servo wiring / wire harness	Perform a single power reset (power off then on) which is the documented first step for this code
66	Bypass water control servo abnormality (bypass flow-control valve) pro repair	Failed, stuck, or debris-fouled bypass water servo / bypass valve; Loose servo wiring / wire harness	Perform a single power reset (power off then on) which is the documented first step for this code
71	Gas valve abnormality – the circuit board cannot properly operate the gas valve and gas solenoids pro repair	Power supplied from a non-pure-sine-wave source (some battery backup / solar inverters); Electrical interference from other appliances on the same circuit; Failed circuit board components	Confirm the unit is plugged into a standard, dedicated household outlet (not shared with noisy appliances or a non-pure-sine inverter); Perform a single power reset
72	Flame rod circuit abnormality – the flame-sensing (flame rod) circuit is reading a fault, for example sensing a flame when the gas valve is closed pro repair	Flame rod or its wiring shorted/grounded; Circuit board fault on the flame-sensing circuit	Perform a single power reset; if the code returns, call a technician
73	Circuit board setting abnormality – usually appears when dip switches or connectors were changed while the unit had power pro repair	Dip switches or connectors changed while powered; Incorrect circuit board / dip switch configuration	Perform a single power reset (unplug, wait, restore power) – this is the documented recovery for a 73 caused by a powered change
90	Combustion abnormality – the air-to-fuel mixture is off specification (unit shuts off). Often raised after the unit repeatedly cannot hit set temperature or the fan speed is over-correcting pro repair	Insufficient gas pressure; Incorrect or poorly installed venting / wrong dip-switch settings (new installs); Dirty internal components, clogged intake/filter, or blocked exhaust termination (older units)	Confirm gas is on and other gas appliances run normally; Confirm the front-cover intake, and the intake/exhaust vent terminations outside, are clear of debris; Clean the internal air filter screen per the owner manual if you are comfortable doing so
92	Neutralizer life-cycle warning (first warning) – the neutralizer cartridge is nearing end of life and should be replaced. The unit still operates. Condensing models pro repair	Neutralizer media approaching the end of its rated service life	No homeowner check needed beyond noting the warning; schedule neutralizer replacement with a licensed technician
93	Neutralizer life-cycle end of life – the neutralizer has reached the end of its rated life and must be replaced. Condensing models pro repair	Neutralizer media fully expended	No homeowner check; arrange neutralizer replacement with a licensed technician
94	Exhaust temperature too high – the exhaust/flue temperature exceeded the allowable limit pro repair	Scale buildup in the heat exchanger; Restricted water flow; Combustion/venting issue raising flue temperature	Confirm the water supply is fully on; Confirm exhaust vent terminations are clear; Perform a single power reset
99	Combustion abnormality (unit shuts off) – abnormal combustion detected, commonly tied to a flue blockage or obstruction pro repair	Blocked or obstructed flue / exhaust venting; Abnormal combustion / air-fuel issue	Confirm the exhaust and intake vent terminations outside are clear of obstruction; Perform a single power reset (power off then on); if it returns, call a technician
760	Remote controller transmission abnormality – a communication fault between the remote controller and the unit's circuit board pro repair	Loose, damaged, or shorted remote-controller wiring; Multiple remote controllers wired incorrectly; Circuit board communication fault	Perform a single power reset to see if communication re-establishes
F76	Multi-system communication error – a communication fault between multiple quick-connected (cascaded/manifolded) units pro repair	More than one remote controller connected across quick-connected units; Quick-connect cable / communication wiring fault between units	No homeowner check on cascade wiring; perform a single power reset and contact a licensed technician if it returns

Noritz water heater codes we get called for most

11 — Ignition failure – the unit failed to detect a flame at ignition (no successful light-off)

Typical causes include no/insufficient gas (empty propane tank, gas valve closed, low pressure); air or restriction in the gas line; airflow / vent blockage. A few things are safe to check yourself (Confirm the gas supply is on and another gas appliance lights normally; For propane, confirm the tank is not empty), but the repair is a licensed, TSBC-certified gas technician job. HeatLand diagnoses and fixes 11 on Noritz water heaters throughout Greater Vancouver.

12 — Flame loss – the burner lit but the flame went out (could not stay lit) during operation

Typical causes include low propane tank volume or undersized gas supply; poor / dropping gas pressure that weakens the flame; vent or air-supply disturbance. A few things are safe to check yourself (Confirm the gas supply is on and other gas appliances run without sputtering; For propane, confirm the tank level is adequate), but the repair is a licensed, TSBC-certified gas technician job. HeatLand diagnoses and fixes 12 on Noritz water heaters throughout Greater Vancouver.

14 — Thermal fuse failure / overheat-prevention device (thermal fuse around the heat exchanger) has triggered due to an overheat condition

Typical causes include heat exchanger overheating; scale buildup in the heat exchanger restricting flow; blocked or restricted water flow. A few things are safe to check yourself (Confirm the water supply to the unit is fully on and not throttled; Perform a single power reset to see if the fault clears), but the repair is a licensed, TSBC-certified gas technician job. HeatLand diagnoses and fixes 14 on Noritz water heaters throughout Greater Vancouver.

61 — Fan (combustion blower) motor abnormality – the fan is not spinning, or spinning much faster/slower than the expected RPM for the current stage

Typical causes include failed or obstructed fan motor; loose fan wiring / wire harness; temporary vent blockage (wind gusts, obstruction). A few things are safe to check yourself (Confirm the intake and exhaust vent terminations outside are clear; Perform a single power reset; an EC61 that only shows in history may have been a transient vent/voltage event), but the repair is a licensed, TSBC-certified gas technician job. HeatLand diagnoses and fixes 61 on Noritz water heaters throughout Greater Vancouver.

Is it safe to keep running a Noritz water heater with a fault code?

Most Noritz fault codes put the water heater into a safe lockout for a reason. You can safely check the basics — the gas supply on, the pilot light or igniter, the temperature dial setting, the breaker on (power-vent/electric/hybrid models), and no water leaking around the tank — and restart it once. If the code returns, stop and book a technician. If you smell gas, leave the building and call your gas utility’s emergency line or 911 first. If a carbon-monoxide alarm sounds, get everyone out and call 911. Never cap or block the temperature & pressure (T&P) relief valve, and don’t keep relighting a pilot that won’t stay lit.

Noritz water heater repair across Greater Vancouver

HeatLand has kept Metro Vancouver homes comfortable since 1999. Our licensed, insured technicians diagnose and repair Noritz water heaters — pilot and ignition faults, gas-control (status-light) codes, sensor and thermostat errors, vent and air-intake blockages, leak shut-offs, and (on hybrid/heat-pump and tankless models) control-board and component faults — including units we didn’t install. We’re brand-agnostic, carry common parts, and give you an honest repair-or-replace assessment with upfront pricing and a free estimate. If your water heater is beyond economical repair, we’ll show you right-sized, high-efficiency replacement options and the rebates available.

Need it sorted fast? We offer priority emergency water heater repair. Explore Water Heater services, browse all water heater error codes by brand, or request a free estimate.

Noritz water heater service areas

We repair Noritz water heaters across Greater Vancouver and the Fraser Valley, including:

Noritz water heater error code FAQs

Can I reset my Noritz water heater myself?

Yes — power-cycling the reset button once is generally safe after you’ve checked the basics (the gas supply on, the pilot light or igniter, the temperature dial setting, the breaker on (power-vent/electric/hybrid models), and no water leaking around the tank). If the water heater faults again right away, stop and note the code — repeatedly resetting a water heater that keeps locking out can mask a real problem. Call a licensed, TSBC-certified gas technician to diagnose it.

What does the Noritz 11 code mean?

On Noritz water heaters, 11 commonly indicates ignition failure – the unit failed to detect a flame at ignition (no successful light-off). Confirm the exact meaning against your unit’s manual — codes can vary by model and series — and have the repair done by a licensed, TSBC-certified gas technician. HeatLand fixes this across Greater Vancouver.

Do you repair Noritz water heaters you didn’t install?

Yes. HeatLand is brand-agnostic and services Noritz water heaters throughout Metro Vancouver and the Fraser Valley, whether or not we installed the unit. We carry common parts and give you an honest repair-or-replace assessment.

Is a Noritz water heater fault code an emergency?

No heat in cold weather is worth treating urgently. If you smell gas, leave the building and call your gas utility’s emergency line or 911 first. If a carbon-monoxide alarm sounds, get everyone out and call 911. Never cap or block the temperature & pressure (T&P) relief valve, and don’t keep relighting a pilot that won’t stay lit. For priority water heater repair across Greater Vancouver, call (604) 330-3812.

How much does Noritz water heater repair cost in Vancouver?

It depends on the fault. Many Noritz codes point to sensors, ignition or pump parts — usually far cheaper than replacement. We give upfront pricing and a free estimate before any work.

More Water Heater error-code guides

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