Noritz Tankless Water Heater Error Codes: The Complete Guide

By the Certified Technicians at THE Water Heater Company
Noritz Authorized Service Provider & Installer | Three Locations Serving Ventura County, Los Angeles County, Orange County & Santa Barbara Since 2018
Last Updated: July 2026

Your Noritz Is Talking to You. Here's How to Understand What It's Saying.

You walked over to your Noritz tankless water heater and saw a code blinking on the display. Maybe the shower went cold first and sent you looking. Maybe the unit started beeping. Either way, you want to know: What does this mean? Is it serious? And what do I do next?

You are in the right place.

This is the most complete guide to Noritz tankless water heater error codes we can build — sourced directly from Noritz's own official Service Manual for the current condensing lineup, not copied from other websites and not guessed at. We are THE Water Heater Company: a Noritz Authorized Service Provider and a Noritz installer, with three locations across Southern California — Camarillo, Van Nuys, and Santa Ana — serving Ventura County, Los Angeles County, Orange County, and the City of Santa Barbara. Noritz is one of our flagship installed brands, and our certified technicians work on Noritz units every day.

This guide covers the EZ71DV, EZ98DV, and EZ111DV condensing tankless units, their recirculation-equipped siblings the NRCR92DV and NRCR111DV, and — briefly — the commercial NCC199CDV. We'll explain every documented error code in plain English: what it means, what's causing it, and what needs to happen next.

But before we get to the codes, there is something important you need to understand first.

⚠️ A Critical Safety Warning Before You Read Any Further

Noritz tankless water heaters are not simple appliances. They are sophisticated systems that sit at the intersection of four potentially dangerous forces inside your home:

1. Natural Gas or Propane — Noritz's own documentation states this plainly: if you smell gas, do not try to light any appliance, do not touch any electrical switch, and do not use any phone inside the building. Leave, call your gas supplier from a neighbor's phone, and call the fire department if you cannot reach them.

2. High-Voltage Electricity — Never touch the power cord with wet hands, and the unit must be properly grounded. The control board, sensors, fan motor, and solenoid valves inside all carry live current, and Noritz's own service technicians are trained specifically on this before they're allowed to open a unit.

3. Pressurized Water — Noritz's Owner's Guide carries a direct DANGER warning: "If the temperature and pressure relief valve is dripping or leaking, have a qualified service technician replace it. Do not plug or remove the valve."

4. Combustion Exhaust — Noritz's manual includes a standalone DANGER block on this exact point: "After the water heater has been out of use for a long time make sure that you fill the condensate trap with water. This is to prevent dangerous exhaust gases from entering the building. Failure to fill the condensate trap could result in severe personal injury or death."

There's also a scalding warning worth knowing: Noritz states that water temperatures over 125°F (52°C) can cause severe burns instantly or death from scalding, with children, the disabled, and the elderly at highest risk.

This combination of gas, electricity, water, and exhaust is why Noritz tankless water heaters should only be diagnosed and repaired by a licensed, trained professional. Noritz's own Service Manual — the technician training document this article is built from — goes further than most manufacturer literature on this point. Its Descale Procedure instructions state directly:

"This procedure is only intended to be performed [by] a qualified service professional or authorized Noritz service representative. Any unauthorized performance of this procedure may not be covered by the Noritz America Limited Warranty."

That's not a generic disclaimer. That's Noritz naming, in writing, who is allowed to touch this equipment and still keep the warranty intact.

This guide is written to help you understand what is happening with your unit — not to guide you through a repair. Think of it the same way you would think of a medical reference guide: knowing what a diagnosis means is helpful and important, but it does not replace a trained doctor performing the actual procedure.

If you are in Ventura County, Los Angeles County, Orange County, or the Santa Barbara area and your Noritz unit is showing an error code, call THE Water Heater Company at (877) 798-7487. We are a Noritz Authorized Service Provider and installer with three locations across Southern California, and we are here to help.

How Do Noritz Error Codes Work?

Every Noritz EZ- and NRCR-series unit has a display — either a simple display window, or, on the newer "-1" hardware revision units, a full Operation Panel with Menu, Up, Down, Back, and OK buttons. Either way, the display does more than just show error codes. Per Noritz's own Visual Indicators reference:

• When first plugged into power, the unit shows the set temperature for about three minutes.
• When turned off, it displays "oFF" for three minutes.
• A segment rotates around the display while water is flowing; it rotates slowly if the flow rate is too low to fire the burner.
• If the unit is pairing with the EZ Start Plus app over Bluetooth, a 3-digit passcode displays for 30 seconds.
• If an error occurs, the display blinks the code.

How to Check Your Noritz Error Code History

This is a genuinely useful feature most homeowners never discover. Noritz units keep an internal log of past error events — including some codes that never even cause a current problem, and only ever show up in this history. You (or, better, your technician) can view it two ways:

• Through the EZ Start Plus app: open the app, tap "Maintenance," and the maintenance/error information for your unit displays there.
• Through the Operation Panel (on "-1" hardware revision units): press the menu button and navigate to "Maintenance Monitor."

If your technician asks what your unit's error history shows, this is where that information lives — and it's often the fastest way to catch an intermittent problem that isn't actively displaying a code the day the technician arrives.

The Most Important Thing to Understand: How Noritz Actually Classifies Its Codes

This is something most guides do not explain — and it's one of the most important things to understand about your Noritz unit.

Here is our gold-standard citation for the whole Noritz lineup, from Noritz's official NRCP1112-DV Owner's Manual — the clearest soft-lockout/hard-lockout definition of any manufacturer we've researched:

"The water heater shall enter a soft lockout condition if the error is such that it can return to normal operation once the condition relieves itself. The water heater shall enter a hard lockout if the condition indicates the unit detected a condition preventing safe operation."

That definition set the standard for how we think about every brand we cover. On the current EZ/NRCR/NCC199CDV generation, Noritz's Service Manual doesn't repeat those exact words — instead, it marks every code in its own official table using a system that maps onto the same idea, only made even more precise. Three markers appear directly in Noritz's documentation:

1. "(F)" — Fault Codes

Most codes in the table carry an "(F)" prefix. These are genuine fault conditions — the unit has detected something wrong that needs a technician's diagnosis. Many of these explicitly state in Noritz's own words: "To reset this error code, the power needs to be disconnected and then reconnected." Clearing the display with a power cycle is not the same as fixing the problem — if the code returns, the underlying fault is still there. This is your hard-lockout-equivalent category.

2. "(Only Warning Indication)"

A smaller number of codes are explicitly labeled by Noritz as warnings, not faults — even though some still carry the "(F)" prefix. Code 06 (low recirculation flow, NRCR only) and Code C1# (the service reminder) both fall here. The unit keeps running. Something needs attention, but nothing has shut down.

3. "(Only in Error Code history)"

A handful of codes — 10, 50, 74, and 760 — are explicitly marked by Noritz as appearing only in the error history, never as a live, current-operation lockout. Code 50, for example, simply means the unit detected 24 straight hours of continuous flow — Noritz's own note says plainly: "This code does not indicate a water heater malfunction." These are log entries for a technician's reference, not something a homeowner needs to react to in the moment.

The takeaway: if your display is actively blinking a code right now, it's an "(F)" fault or a warning — call a professional. If a technician mentions a code from your unit's history, that's diagnostic context, not an active emergency.

EZ-Series vs. NRCR-Series: Why Your Model Matters When You're Reading a Code

Noritz sells this condensing platform in three configurations, and the difference matters for reading your error code correctly.

• EZ71DV, EZ98DV, and EZ111DV are the standard EZ-series units — no built-in recirculation pump.
• NRCR92DV and NRCR111DV are the recirculation-equipped siblings, with a built-in pump and an "Auto-Recirculation" feature that learns your household's hot water usage pattern.
• NCC199CDV is Noritz's commercial version of this platform — see the note below.

Four codes in the official table are NRCR-exclusive, because only NRCR models have a recirculation system to malfunction: 06 (low recirculation flow), 42 (recirculation water flow sensor abnormality), 63 (recirculation abnormality / no recirculation flow), and 79 (circuit board pump-control-circuit failure). If you own a plain EZ71DV, EZ98DV, or EZ111DV, none of these four codes can ever appear on your unit.

It also shows up in your warranty. EZ-series units installed in a straightforward single-family application carry a longer heat exchanger warranty term than NRCR units — the built-in recirculation pump changes the unit's duty cycle. More on this below.

A note on the commercial NCC199CDV: if you have this model, most of the codes below apply to you too. The commercial unit adds two multi-system-specific codes not present on the residential lineup — 41 (multi-system water servo abnormality) and 66 (water servo-bypass abnormality) — and its Code 20 definition additionally covers a second high-limit switch (on the hot water side, not just the heat exchanger). If you have an NCC199CDV showing a code, call us with your model and code and we'll walk you through it directly.

Quick Reference: Noritz Error Codes at a Glance

Verified against Noritz's official Service Manual, Rev. 3/26. Sub-codes (e.g., 12-1, 12-2) share the same base description; call us with the full sub-code for the most precise diagnosis.

Code	What It Means	Applies To	Type
06	Low recirculation flow	NRCR only	Warning Indication
10	Combustion abnormality (fan speed limited)	All models	History only — not a current lockout
11	Ignition failure	All models	Fault
12	Flame Rod does not detect flame	All models	Fault
13	External CO detector triggered	All models (if CO detector interlock installed)	Fault
14	Overheat Prevention Device (Thermal Fuse) triggered	All models	Fault
16	Abnormally high output temperature	All models	Fault
20	High Limit Switch triggered — can be scale-caused	All models	Fault
29	External Condensate Pump abnormality	All models (if external condensate pump installed)	Fault
30	Thermistor-Air abnormality	All models	Fault
31	Thermistor-Cold Water abnormality	All models	Fault
32	Thermistor-Hot Water abnormality	All models	Fault
33	Thermistor-Heat Exchanger Outlet abnormality	All models	Fault
35	Thermistor-Exhaust abnormality	All models	Fault
41	Multi-system Water Servo abnormality	NCC199CDV only	Fault
42	Water Flow Sensor (Recirculation) abnormality	NRCR only	Fault
50	Extended Continuous Flow Detected (24 hrs+)	All models	History only — not a malfunction
61	Fan Motor abnormality	All models	Fault
63	Recirculation Abnormality (no recirculation flow)	NRCR only	Fault
65	Water Servo abnormality	All models	Fault
66	Water Servo-Bypass abnormality	NCC199CDV only	Fault
70	Circuit Board abnormality	All models	Fault
71	Gas Valve drive circuit abnormality	All models	Fault
72	Flame Rod circuit abnormality (false flame detection)	All models	Fault
73	Circuit Board setting abnormality	All models	Fault
74	BLE (Bluetooth) connection error	All models	History only — not a current lockout
76 / F76	Multi-system communication error	Multi-unit installations	Fault
79	Circuit Board (pump control circuit) abnormality	NRCR only	Fault
90 / 901 / 908	Combustion abnormality — unit shuts off	All models	Fault
91	Gas type / conversion may be improper	All models	Fault
94	Exhaust temperature too high	All models	Fault
760	Remote Controller transmission abnormality	Units with remote controller	History only — not a current lockout
C1# (1–9)	Service Reminder — heat exchanger flush due	All models (if reminder enabled)	Warning Indication

The Complete Noritz Error Code Reference

Below is a deep dive on the codes homeowners are most likely to actually see or need to understand — the ones involving safety, gas, combustion, or your warranty. Every other code from the table above is fully accurate and callable; if yours isn't detailed below, it's covered in the quick reference table and we're glad to explain it over the phone.

Error Code 11 — Ignition Failure

What does Noritz Error Code 11 mean?

Noritz Error Code 11 means the unit tried to ignite the burner and failed. This is the most common code homeowners will ever see on a Noritz tankless unit.

Applies to: All models

Type: Fault — professional diagnosis recommended if it recurs.

Common causes, per Noritz's official Service Manual:

• Gas supply piping or pressure issue
• Igniter spark problem
• Gas valve issue
• Flame rod issue
• A grounding problem, particularly at the circuit board's ground connection

What you should do: A single, isolated Code 11 that clears when the fixture is closed and reopened, or after a power cycle, may reflect a one-time hiccup. A Code 11 that returns is telling you one of the items above needs a professional's attention — this list touches gas supply and ignition components directly, not homeowner territory.

⚠️ One important nuance: if you're draining your Noritz for winter or a long vacancy, Code 11 (or a related display change) can appear simply because there's no water flow to support ignition during a drain-down. That's expected, not a malfunction — don't panic and don't cut power mid-procedure.

Error Codes 90, 901, and 908 — Combustion Abnormality (Unit Shuts Off)

What does Noritz Error Code 90 (or 901, or 908) mean?

Noritz's own documentation labels this family "combustion abnormality" and states directly that the unit shuts off when it occurs.

Applies to: All models

Type: Fault — the unit shuts down and a power cycle is required to reset it; if the display continues, Noritz's guidance is to contact the nearest agent.

Common causes, per Noritz's official Service Manual, by sub-code:

• Air supply vent blocked (for units drawing combustion air from indoors)
• Exhaust vent blocked or obstructed
• Low gas supply pressure — needs a professional pressure check
• Condensate drain line clogged, frozen, or not sloped correctly downward — this specific sub-condition displays as "908," and Noritz's manual notes explicitly that when 908 appears, a lockout has been activated

What you should do: Check for obvious vent blockage and confirm the condensate line has a proper downward slope and isn't frozen. Beyond that, this code family touches gas pressure and combustion directly — it needs a licensed technician, not a homeowner fix.

Error Code 91 — Gas Type / Conversion Error

What does Noritz Error Code 91 mean?

Noritz Error Code 91 means the system suspects the gas type setting, orifice, or conversion doesn't match what's actually being supplied to the unit.

Applies to: All models

Type: Fault — requires a power cycle to reset, and correction by the installer.

Common causes:

• The gas orifice, gas type setting, or LP conversion wasn't completed correctly
• Vent type, length, size, or elevation settings don't match the actual installation

What you should do: Gas conversion and vent-configuration settings on a Noritz unit are never a homeowner task. If you see Code 91, contact your installer. If you ever smell gas after any conversion work, turn the unit off and contact your gas supplier immediately.

Error Code 20 — High Limit Switch Triggered (The Scale-Damage Code)

What does Noritz Error Code 20 mean?

Noritz Error Code 20 means a high-limit safety switch tripped because the unit detected an unsafe temperature condition inside the heat exchanger. This is the code that matters most for your wallet.

Applies to: All models

Type: Fault — requires a power cycle to reset.

Common causes, straight from Noritz's Service Manual:

• The High Limit Switch-Heat Exchanger has been triggered
• Improper connection of the High Limit Switch
• Scale build-up in the heat exchanger — Noritz's own manual states plainly: "This error code may be caused by scale build-up in the Heat Exchanger."

What you should do: This needs a professional diagnosis, and if scale is the cause, a heat exchanger flush. This is the code we want every homeowner to connect to the friendlier-looking C1# reminder below — they frequently share the exact same root cause.

⚠️ The escalation story: Code C1# is Noritz's polite, early warning that scale is building up. Code 20 is what can happen if that warning goes unaddressed long enough for the heat exchanger to overheat. Same cause, very different level of urgency — and neither one is covered under warranty, which we cover in detail below.

Error Code 13 — External CO Detector Triggered

What does Noritz Error Code 13 mean?

Noritz Error Code 13 means an externally interlocked carbon monoxide detector has signaled the water heater's control system.

Applies to: All models with a CO detector interlock installed

Type: Fault.

Common causes:

• Abnormal combustion
• A vent component that has come loose or disconnected
• Exhaust leaking from a vent pipe joint
• Damage to the CO detector's wiring

⚠️ This one deserves its own safety note. Carbon monoxide is odorless and colorless. If your unit displays Code 13, or if anyone in the home shows symptoms of CO exposure (headache, dizziness, nausea), leave the building immediately and call 911. Do not attempt to reset this code and continue using the unit before a professional has confirmed the cause.

Error Code 14 — Thermal Fuse (Overheat Prevention Device) Triggered

What does Noritz Error Code 14 mean?

Noritz Error Code 14 means the unit's Thermal Fuse — a physical overheat safety device — has been triggered.

Applies to: All models

Type: Fault.

Common causes:

• Melting or physical damage to the Thermal Fuse
• Improper connection of the Thermal Fuse

What you should do: This is a physical safety component that has done its job by shutting things down. It requires a technician to inspect and, if damaged, replace it — never a homeowner repair.

Error Code 72 — Flame Rod Circuit Abnormality

What does Noritz Error Code 72 mean?

Noritz Error Code 72 means the flame rod circuit is detecting current as if a flame is present when no flame actually exists.

Applies to: All models

Type: Fault.

Common causes:

• A ground fault
• A flame rod or circuit issue causing a false flame reading

What you should do: This one is subtle and exactly the kind of code that shouldn't be reset repeatedly — if the control system is misreading flame presence, that's a safety-relevant sensor problem. Professional diagnosis only.

Error Code 06 — Low Recirculation Flow (NRCR Models Only)

What does Noritz Error Code 06 mean?

Noritz Error Code 06 means the built-in recirculation system on an NRCR-series unit is detecting flow, but not enough of it for proper recirculation operation. This code cannot appear on a standard EZ71DV, EZ98DV, or EZ111DV.

Applies to: NRCR92DV, NRCR111DV only

Type: Warning Indication — the unit is not necessarily shut down; Noritz explicitly marks this as a warning, not a hard fault.

Common causes, per Noritz's Service Manual:

• A clogged return line filter
• Incorrect recirculation type setting
• Air in the domestic hot water line and return line (dedicated-mode installations)
• A clogged crossover valve filter (crossover-mode installations)

What you should do: Have a technician check the return line filter and, if applicable, the crossover valve filter. This is a plumbing-connection issue, not an electrical or gas safety issue, but disassembling a pressurized water connection is still a job for a licensed technician.

Error Code C1# (1–9) — Service Reminder: Time to Flush the Heat Exchanger

What does Noritz Error Code C1# mean?

Noritz Error Code C1# is not a malfunction. It's a built-in reminder that the heat exchanger needs a scale flush.

Applies to: All models — but only if the service reminder function has been enabled

Type: Warning Indication. The unit keeps running normally.

What you should do: Have a technician flush the heat exchanger. And here's the detail that should change how seriously homeowners take this one: Noritz's Service Manual states, in its Descale Procedure section, that this flush "is only intended to be performed [by] a qualified service professional or authorized Noritz service representative," and that unauthorized performance "may not be covered by the Noritz America Limited Warranty." This is not a homeowner maintenance task, and it's not a job for just any handyman either — Noritz says so in writing.

A detail almost nobody mentions: this reminder is turned OFF at the factory by default. Nobody sees C1# unless the reminder was enabled at install or by the customer. If it was never turned on, scale can build for years with zero warning on the display — right up until it potentially trips Code 20 instead.

Here's what we do about it: at THE Water Heater Company, enabling this service reminder is a standard step on every Noritz installation we perform. Our customers get the early warning Noritz built — because we turn it on.

Why Annual Maintenance Prevents Most of These Codes

Look back through the full code list and a pattern jumps out. Scale, debris, and blockage sit behind a disproportionate share of these faults — the C1# reminder and Code 20 both trace to heat exchanger scale; Code 06 traces to a clogged filter; Codes 90/901/908 can trace to a blocked vent or clogged condensate line. These are not random electrical failures. They build up slowly, and they are almost entirely preventable.

Noritz's own Service Manual lays out what an annual professional inspection covers — the same list across the EZ-series, NRCR-series, and commercial NCC199CDV:

• Air supply vent — checked for dust, oil, or blockage (for indoor-air-supplied units)
• Exhaust vent and terminal — checked for dust and soot buildup
• General operation — listening for abnormal sounds, checking for discoloration or damage to the cabinet
• Pressure relief valve — verified for proper operation
• Water connections and piping — inspected for leaks
• Condensate drain pipe — checked for blockage at the discharge point
• Clearance area — checked for laundry, newspaper, oil, spray cans, or other combustibles stored too close to the unit or its exhaust terminal

And, separately, the water filter inside the drain valve gets cleaned to prevent the slow decline in hot water output that a clogged filter causes over time.

Think of it like an oil change for your water heater. You wouldn't skip oil changes and wait for your engine to seize. The same logic applies here — and in Southern California, where hard water is a year-round reality in much of our service area, the heat exchanger flush is the single most important item on that list.

Your Noritz Warranty: What's Covered, What Isn't, and Why Descaling Protects It

This is the section most Noritz guides skip entirely, and it's arguably the most important one for your wallet.

How Long Is Your Noritz Actually Covered?

Noritz's warranty depends on your model and how the unit is used. Here's the heat exchanger coverage directly from Noritz's official Limited Warranty document:

Model	Single-Family Dwelling	Controlled Recirculation System	Commercial Use
EZ71, EZ98, EZ111	25 years	15 years	8 years
NRCR92, NRCR111	15 years	15 years	8 years

Every model also carries 5 years on parts other than the heat exchanger and 1 year of reasonable labor, paid by Noritz to the servicing technician on approved warranty repairs.

Notice the EZ-series vs. NRCR-series difference again: a standard EZ71DV, EZ98DV, or EZ111DV installed in a typical single-family home carries a 25-year heat exchanger warranty — the longest term Noritz offers on this platform. The recirculation-equipped NRCR92DV and NRCR111DV carry 15 years under the same conditions, reflecting the additional duty cycle the built-in recirculation pump adds.

The Exclusion That Matters Most in Southern California

Here is the sentence from Noritz's warranty document that should get every Southern California homeowner's attention:

This Warranty becomes null and void if... damage as a result of use with non-potable water, untreated or poorly treated well water, or water with high pH levels or hardness levels in excess of 12 grains per gallon (200 mg/L).

And separately, in the Descale Procedure section of the Service Manual, in the plainest possible words:

"Damage to the water heater due to scale build-up is not covered by the water heater's warranty."

Put that together with what you just read about Code 20, and the takeaway is direct: if your water is harder than 12 grains per gallon and the heat exchanger is never flushed, Noritz can decline warranty coverage on exactly the kind of failure — a scale-triggered High Limit Switch lockout — that flush would have prevented. Much of our Southern California service area runs hard-to-very-hard water, which is exactly why the annual descale isn't an upsell. It's the difference between a heat exchanger covered for up to 25 years and one that isn't.

Other Things That Can Void Noritz's Warranty

• Damage from freezing within the unit or surrounding piping
• Incorrect gas or water pressure, or incorrect sizing for the application
• Improper installation
• The wrong gas type, or a conversion that wasn't done correctly — directly tied to Error Code 91 above
• Purchase or installation through a source not authorized by Noritz — the warranty explicitly does not cover "Non-Authorized Product"

That last point connects directly to the descaling quote above: Noritz doesn't just require the flush to be done professionally — it names "authorized Noritz service representative" specifically. As a Noritz Authorized Service Provider and installer, THE Water Heater Company installs and services these units the way Noritz's own documentation requires to keep the warranty intact.

Frequently Asked Questions About Noritz Error Codes

Q: What's the difference between a "Fault" code and a "Warning Indication" on my Noritz?
Noritz's own Service Manual draws this line for you. A Fault (marked with an "(F)" in Noritz's documentation) means a safety or operating system detected a real problem — the unit needs a technician. A Warning Indication (like Code 06 or C1#) means the unit is still running, but something needs attention before it becomes a bigger problem.

Q: Can I reset a Noritz error code myself?
Power-cycling the unit clears many fault codes temporarily. That is not the same as fixing the problem. Several codes — including 20, 65, 70, 71, 90, 91, and 94 — explicitly require a power disconnect/reconnect just to clear the display, and if the code returns, the underlying cause is still there.

Q: Is my Noritz error code serious?
Anything marked as a Fault in the table above — especially codes touching gas, combustion, or CO detection (11, 13, 90/901/908, 91, 94) — should be treated as urgent. Warning Indications (06, C1#) aren't emergencies, but ignoring them risks the code escalating into an actual fault, and can put your warranty at risk.

Q: What does "(Only in Error Code history)" mean, and should I worry about it?
No. Codes marked this way (10, 50, 74, 760) don't reflect a current problem — they're logged for a technician's reference and don't indicate your unit is malfunctioning right now.

Q: Why does my NRCR model show a recirculation code but my neighbor's EZ111DV never has?
Because Codes 06, 42, 63, and 79 are all recirculation-system faults, and only the NRCR92DV and NRCR111DV have a built-in recirculation pump to fail. The EZ71DV, EZ98DV, and EZ111DV don't have that system, so none of those four codes can appear.

Q: What is Code C1# and should I worry about it?
It's a scheduled maintenance reminder — the unit is still running fine. You should still act on it: it exists specifically to help you avoid Code 20, a real fault that can result from the same root cause (scale), and Noritz's warranty excludes scale damage either way.

Q: Can I flush my own Noritz heat exchanger to clear the C1# code?
No. Noritz's Service Manual states this procedure "is only intended to be performed [by] a qualified service professional or authorized Noritz service representative," and that unauthorized performance may not be covered by the warranty.

Q: How much does it cost to fix a Noritz error code?
Every repair is different and depends on which code is showing, what's causing it, and what parts (if any) need replacement. We believe in transparent, honest pricing — call us at (877) 798-7487 and we'll give you a clear diagnosis and estimate before any work begins.

How Much Does a Noritz Error Code Repair Cost?

Every repair is different, and the true cost depends on which code is present, what's causing it, and what parts (if any) need to be replaced. What we can tell you is this:

• A diagnostic visit identifies exactly what's wrong before any work begins — no guessing, no surprise add-ons.
• Simple fixes — a filter cleaning, a service reset, a settings correction — are almost always less expensive than a component replacement.
• Catching a problem early, while it's still a Warning Indication rather than a Fault, is nearly always less expensive — and, as covered above, it's often the difference between a warranty claim Noritz honors and one it can legally decline.
• Annual maintenance, performed by an authorized service provider, is almost always less expensive than an emergency repair call.

We believe in transparent, honest pricing — no surprises, no pressure. Call us and we'll walk you through exactly what's happening and what it will take to fix it.

Call THE Water Heater Company — Your Noritz Specialists

If your Noritz tankless water heater is showing an error code, THE Water Heater Company is here to help.

We are a Noritz Authorized Service Provider and a Noritz installer — Noritz is one of our flagship installed brands — with three locations across Southern California: Camarillo, Van Nuys, and Santa Ana. We serve homeowners throughout Ventura County, Los Angeles County, Orange County, and the City of Santa Barbara. Our certified technicians work on Noritz units every day. We know these systems inside and out.

Call us at (877) 798-7487 — phones answered by a live person 24/7/365
THEWaterHeaterCompany.com
Camarillo | Van Nuys | Santa Ana

We are Your Trusted Water Heater Authority — and we are ready to get your hot water back.

Related Reading: More Guides from THE Water Heater Company

• Rinnai Tankless Water Heater Error Codes: The Complete Guide
• Rheem Tankless Water Heater Error Codes: The Complete Guide
• Navien Tankless Water Heater Error Codes: The Complete Guide
• Bradford White Water Heater Status Light Codes: The Complete Guide
• A.O. Smith Tankless Water Heater Error Codes: The Complete Guide
• Takagi Tankless Water Heater Error Codes: The Complete Guide
• Water quality profiles for 99 Southern California communities
• The State of Hot Water 2026 report

Sources: Noritz EZ71DV/EZ98DV/EZ111DV/NRCR92DV/NRCR111DV/NCC199CDV Service Manual (Rev. 3/26, Noritz America Corporation), including the Error Codes and Checkpoints, Visual Indicators, Periodic Inspection, Periodic Maintenance, and Descale Procedure sections; Noritz EZ71DV/EZ98DV/EZ111DV/NRCR92DV/NRCR111DV Owner's Guide (doc SBB81HC, Rev. 01/24, Noritz America Corporation); Noritz EZ71DV/EZ98DV/EZ111DV Specification Sheet (Rev. 10/2024); the Noritz NRCP1112-DV Owner's Manual (soft lockout / hard lockout engineering definition). Field experience provided by THE Water Heater Company, Noritz Authorized Service Provider and installer — Camarillo, Van Nuys, and Santa Ana, CA.