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Noritz tankless water heater at InspectApedia.com Noritz Water Heater Error Codes & Manuals
What does each Noritz error code mean?
What are the repair steps for each Noritz error code?

Noritz tankless gas water heater manuals, error codes, company contact information.

We give contact information for Noritz water heater, geyser, cylinder, calorifier manufacturers and for water heater installation, operation, & troubleshooting manuals.

Our photo at page top shows a Noritz tankless water heater. Noritz heaters are available in models for either natural gas or propane.

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Noritz Tankless Water Heater Age, Manuals, Error Codes

Noritz Tankless Water Heater Error Codes - complete list

Table of Noritz Tankless Water Heater Error Codes
Error Code Meaning
Noritz Code 05

Service Warning (Turns on automatically when service is due)

Call Noritz service technician for regular service.

Noritz Code 10

Problem in gas combustion that causes the power level drop, while the combustion continues even after shutdown.

Check for foreign materials found on the burner which is burning after gas combustion stops. (Clean the burner if dirty)

Check for blocked exhaust flue.

To reset the error code 10, the power must be disconnected

If there is a recirculation loop use an aquastat to keep 10 degree differential.

Turn unit off, then back on.

Noritz Code 11 2

 

Ignition Failure.

Check that the gas valve opens.

Press power button to turn unit off, open a hot water faucet, turn unit back on.

If the error code no longer flashes the problem is solved.

Check for blocked combustion air supply. Check for debris on the gas burner or gas supply orifice.

Check for proper gas type (LP vs Natural gas), pressure, free flow through gas piping and valves, clean flame rod (ignition rod),

assure no blockage in vent or vent connector, clean ignition plug.

See Noritz Tankless Water Heater Seven Common Error Codes & Repairs [PDF]
Noritz Code 12 2

Burner flame loss during operation, or Bad flame detection rod.

Weak gas burner flame.

Check for proper gas pressure, free flow, no blockage in vent.

Check for adequate combustion air.

Clean ignition plug & flame sensor rod.

Also see Noritz error code 11.

See NORITZ TANKLESS WATER HEATER SEVEN COMMON ERROR CODES & REPAIRS [PDF]
Noritz Code 14

Thermal fuse failure.

Replace the thermal fuse.

The thermal fuse is a white cord which wraps around the heat exchanger.

Failure cause: scaled or dirty heat exchanger,

Check for obstructed combustion air flow, clean proper burner operation.

Check water quality for hardness or sediment that can clog the heat exchanger. Flush scaled heat exchanger. Use a scale remover if needed.

Noritz Code 16 2

Extremely high water temperature. Sudden increase in hot water temperature.

Watch out: excessive Noritz hot water temperature is a dangerous scalding hazard.

See NORITZ TANKLESS WATER HEATER ERROR CODE 16 [PDF]

See also NORITZ TANKLESS WATER HEATER SEVEN COMMON ERROR CODES & REPAIRS [PDF]

Check for sediment or scale clogging and clean or descale the unit using a cleaner such as vinegar or a descaler.

Check manifold pressure adjustment.

Noritz Code 20

High limit switch activated.

Check or replace high limit switch.

Check for scale and descale the heater.
Noritz Code 21

Pressure switch abnormality.

Check / replace pressure switch.

Check fan motor operation.

Check for blocked exhaust flue.

Noritz Code 29 2

High water level in neutralizer; neutralizer clogged. Condensate drainage problem.

Check for clogged condensate drain; check for damp or wet or damaged water level sensor.

Check for frozen neutralizer due to condensate clogging.

Watch out: flooding the burner with condensate can cause costly damage.

See NORITZ TANKLESS WATER HEATER SEVEN COMMON ERROR CODES & REPAIRS [PDF]
Noritz Code 31

Inlet thermistor failure.

Replace the inlet thermistor.

Noritz Code 32

Outlet thermistor failure.

Replace the outlet thermistor.

Noritz Code 33

Heat exchanger thermistor failure.

Replace the heat exchanger thermistor.

Noritz Code 410

Multi-system flow imbalance error.

Check blocked heater flow

Check heater filter

Check flow sensor for damage or debris
Noritz Code 43 Invalid number, possibly mis-read for actual code 73.
Noritz Code 45

Water leak.

Close water supply valve.

Look for water leaks.

If no leak seen, unplug heater for 30 seconds or more, then re-connect.

If error code clears continue use; else call for service.

Noritz Code 51

Noritz Code 51: Gas Manifold Solenoid Failure

A reader opined that for some models this code means Noritz manifold replacement is needed.

See Error Code 59 below.

Noritz Code 56

CCP Valve abnormality

Check for blocked heater flow/obstructions

Check CCP valve via the system controller & replace uncertain CCP valve
Noritz Code 57

Low water pressure in water supply to the boiler.

Check water pressure, flow, and positions of water shutoff valves.
Noritz Code 59

Low input BTU, insufficient gas supply, combustion problems such as obstructed exhaust flow.

Check for blocked exhaust flue.

Check for adequate combustion air; check for blocked exhaust venting; clean fan motor & burner chamber.

Check for a stuck exhaust damper or too-long or too many elbows in exhaust vent.

Check that the heater is properly set for the elevation where installed.

Occurs if natural gas pressure is below 5" WC or propane below 8" WC.
Noritz Code 61

Fan motor failure.

Check voltage to the fan motor.

Replace faulty fan motor or faulty circuit board (that controls the fan).

Noritz Code 63

Recirculation Abnormality - Condensing Tankless Gas Water Heater NRCR111DV & NRCR92DV

Check return line filter.

Check the crossover valve’s filter.
Noritz Code 65

Main flow control valve abnormality

Check for blockage of main servo
Check operation of main servo
Main servo may need to be replaced

Noritz Code 66

Bypass flow control valve failure.

Check for blockage of the bypass servo valve or replace the valve.

Noritz Code 67

AGM (Air-Gas Mixer) abnormality.

Turn power off, wait 30 seconds, turn power on. If code clears, continue use.

If code reappears, replace the AGM
Noritz Code 70

Circuit board fault.

Replace the circuit board.
Noritz Code 71

Gas valve drive circuit abnormality.

Water heater connected to battery backup, solar power, or generator and voltage supply is not stable.

Check voltage delivered from circuit board.

Check the unit's electrical ground continuity.

In area of unstable power, install a power surge protector.

Noritz Code 72

Flame rod flame detection error: flame detected without proper ignition sequence.

Check for proper electrical ground. Check for damaged circuit board. Check for damaged flame detection circuit / wires.

Noritz Code 73 2

Circuit board setting error.

Re-set the unit by disconnecting power for 30 seconds.

Review & correct circuit board programming / switches.

Common cause: connection changed (jumper on the circuit board or moving a dip switch) with power on.

Check for circuit board damage

If failure persists replace the circuit board.

See NORITZ TANKLESS WATER HEATER SEVEN COMMON ERROR CODES & REPAIRS [PDF]
Noritz Code F76 2

Multi-system communication error.

Breakdown in communication between two tankless water heaters using the Quick Connect Cord.

Disconnect power to reset the unit. Check cord connections.

Make sure that only one remote control is hooked up when two units are connected.

See NORITZ TANKLESS WATER HEATER SEVEN COMMON ERROR CODES & REPAIRS [PDF]
Noritz Code 760

Remote controller problem.

Check for loose wire connections.

Re-set the unit. Unplug from power, wait 30 seconds, re-connect.

Check that only 1 remote controller is connected to the heater.

Noritz Code 78

Fan motor failure.

Check for an obstruction blocking the fan;

Confirm that the fan motor is receiving electrical power.

Test or replace the fan motor assembly.

Noritz Code 90 2 / 99

Combustion gas alert.

Check for proper gas flame color (light blue, yellow tips). Check for blocked flue, dirt on gas burner.

Have a professional check the gas supply pressure and check for blockage in the gas supply line.

Noritz Code 90

Combustion gas problem.

Check for proper combustion air, check flame color - as per code 90/99 above.

To reset the Noritz error code: unplug the unit for 30 seconds, then re-connect.

Noritz Code 92, 93

Neutralizer near end of life

Replace the neutralizer immediately

Noritz Code 99 Contact Noritz
Noritz Code F90

Combustion gas alert. (Improper air-fuel mix)

Check for blocked exhaust flue.

Check for debris in fan motor.

Have a professional check the gas supply pressure.

Check vent length, bends, elbows, draft, dip switches.

Noritz Code 903

Combustion abnormality

Check combustion air flow

Check combustion flame, gas supply

Check exhaust vent for blockage
Noritz Code 941, 942

Excessive exhaust temperature

Check combustion air supply for blockage

Check exhaust vent for blockage

Call for service / repair.

Noritz Code F99

Check for blocked exhaust flue.

See NORITZ TANKLESS WATER HEATER SEVEN COMMON ERROR CODES & REPAIRS [PDF]

Noritz Code 92 / 93

Noritz Code F92
Noritz Code F93

Neutralizer life cycle alert.

Replace the neutralizer & re-set the burner timer.

Noritz Error Code C or CF

Noritz Code CF1 CF2 CF3 or CF4

Noritz Code CFH

Scale blockage of the heat exchanger.

Heater will be locked off.

Flush & clean the heat exchanger.

You may need to hire a trained service technician to use a scale removing cleaner or chemical.

Heat exchanger replacement needed in severe cases.

Noritz Code H nn

H followed by 2 numeric digits

Scale blocked heat exchanger, detected after re-connecting electrical power

Other Noritz water heater error codes not in this table: Contact Noritz

Notes to the table above

  1. Sources: Noritz Water Heaters, Noritz North America Headquarters: 11160 Grace Avenue Fountain Valley, CA 92708 Phone: 714-433-2905
  2. Noritz, Seven Most Common Noritz Tankless Error Codes, op. cit., retrieved 2024/03/12, original source: https://noritz.com/how-to-resolve-the-seven-most-common-noritz-tankless-error-codes/

Watch out: some water heater defects represent dangerous conditions, risking fire, explosion, or carbon monoxide poisoning or scalding hazards. Work on these heaters must be by a qualified service professional.

See the water heater manual or troubleshooting manual for your specific water heater model for expanded detail about the meaning and the corrective steps for each of these error codes.

Watch out: your water heater model may use different codes or may provide error codes that are not given here. Therefore you'll want to consult the manual for your specific heater, or ask us for help by posting a question at the bottom of this page.

Noritz Water Heater Manual Free Downloads

Noritz CB180 whol ehouse water heater cited & discussed at InspectApedia.com

Image: the Noritz CB180 combination boiler, whole house domestic water heater, 18,000 to 180,000 BTUh and 0.5 to 9.1 GPM.

Noritz Remote Controller (RC-7646M-2) at InspectApedia.com

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Reader Comments, Questions & Answers About The Article Above

Below you will find questions and answers previously posted on this page at its page bottom reader comment box.

Reader Q&A - also see RECOMMENDED ARTICLES & FAQs

On 2024-03-12 by King

Noritz Model NRCP1112-DV has an error code 78 displayed and is not heating the water, green light above the clock symbol on the digital display blinks

On 2024-03-12 by InspectApedia Publisher - Noritz Model NRCP1112-DV has an error code 78

@King,

Other Noritz sources I researched point to Noritz Error Code 78 as a heater fan motor failure. Check the fan itself for any obstructions that keep the fan blades from rotating freely.

If with POWER OFF you can spin the fan freely by hand then the fan is not obstructed..

Next we look at the fan motor itself - a small electric motor that could

- not be getting electrical power - a service tech would check for power using a voltmeter or multimeter

- have a failing bearing (if the fan won't spin that's likely, or if the fan wobbles the bearing could be worn and loose)

- have a burnt-up motor winding

So if there's no obvious fan blockage you'll want help from a trained Noritz repair technician who will check, and probably replace the fan motor.

Please do keep me posted as what you find will help other Noritz water heater owners who encounter this error 78 code.

Daniel

On 2023-06-15 by steve

Error code 65 0n noritz RC-7646M-2. Can I resolve problem myself?

On 2023-06-15 by InspectApedia DF (mod) - Noritz Error code 65

@steve,

Above on this page, we list Error Code 65 and what to do. Whether you are able to do those tasks yourself depends, of course, on your knowledge and ability, of which we know nothing.

Take a look at those steps and let us know if you have additional questions.

On 2023-03-21 by Tanya

My Noritz continues to shut off if I haven't turned my water on for several hours or when I'm out of town. Why?
Also, I always get code 760 and LL. What does that really mean?

On 2023-03-21 by InspectApedia Editor - Noritz error code 760

@Tanya,

Can you tell us the model number of your Noritz water heater so we can try to find the owner's manual for that model?

Also, above on this page is a long list of error codes of which 760 (one of the ones you mention) is one. And are you sure the other error you mention is LL, or could it be 11 (eleven, also in the above list)? Please take a look there.

Watch out: some water heater defects represent dangerous conditions, risking fire, explosion, or carbon monoxide poisoning or scalding hazards. Work on these heaters must be by a qualified service professional.

Let's see if the water heater manual or troubleshooting manual for your specific water heater model gives us expanded detail about the meaning and the corrective steps for each of these error codes.

On 2023-02-03 by Maxine

I have had my water heater descaled twice. It still shuts off. The error code is 16. I think my water is getting too hot. I have turned it down to 110 but it still get really hot. Could it be the thermostat

On 2023-02-03 by InspectApedia Publisher - Noritz Error Code 16

@Maxine,

It could be that the descaling of your water heater didn't remove scale from a sensor, or yes, it could be a bad thermostat.

Above on this page at our entry for Noritz Error Code 16 you'll see a few articles listing some repair suggestions to try.

Let me know how that works for your heater.

On 2022-10-13 by Jerry Cooper

Our tankless water heater is throwing a code 45 which would be a leak in the hot water line. In fact we did find a leak in a hot water faucet in the bathroom and we have repaired that leak.

But now the hot water line has air in it and I believe that that is causing the tank to throw additional code 45s and I believe the answer would be to purge the air out of the system. Am I on the right track?

On 2022-10-14 by InspectApedia-911 (mod) - Noritz water heater error code 45

@Jerry Cooper,

Thanks for the Noritz water heater error code question.

If your water line leak has been correctly repaired, and if there are no other leaks, then any air in the piping following that repair should certainly be forced out as soon as you run water through the pipe.

So if you are still seeing the same error code you may want to look at the water heater reset instructions or you can try turning it off waiting a bit and turning it back on to see if that resets the code.

If you still see the error code I suspect there's another leak to be found.

On 2022-07-07 by Janet Lytle

new system CB 199 DV showing error code 30. how do I correct?

On 2022-07-07 by InspectApedia-911 (mod) - Noritz error code 30 typically indicates a burner flame or adjustment problem.

@Janet Lytle,

Noritz error code 30 typically indicates a burner flame or adjustment problem.

You might also see the display flashing between Noritz error code 30 and Noritz error code 32.

To clear Noritz error code 30 try this first:

Unplug the Noritz heater for 30 seconds, then re-connect it.

If that does not clear the error code and restore the heater to normal operation then

you should call your Noritz heater installer/service technician to make sure that the burner is correctly adjusted and is operating safely.

The service technician may check for blocked exhaust flue or for debris in fan motor blower assembly.

She may also check the gas supply pressure.

You can contact

Noritz Water Heaters,

Noritz North America Headquarters: 11160 Grace Avenue Fountain Valley, CA 92708 Phone: 714-433-2905

On 2022-03-09 by Southtowne

Error code cfd

On 2022-03-09 by Inspectapedia Com Moderator - Noritz CFH error code indicates that the heat exchanger is scale-clogged

@Southtowne,

Thank you for the helpful question.

You'll see the Noritz C-series error codes including CFH at the last two lines of the Noritz error code table above on this page.

CFH indicates that the heat exchanger is scale-clogged and probably that electrical power was turned off, then turned back-on.

You will need to have the heat exchanger cleaned - descaled, probably by a trained service technician.

In severe cases it could be necessary to replace a badly scale-clogged heat exchanger, especially if it has been cleaned several times in the past.

On 2022-01-29 by Rick Herndon - Noritz error code 14 trouble

Originally had fuse replaced because of error code 14. had hot water for 8 hours, now error code 20 and no hot water pressure at all.

On 2022-01-30 by Inspectapedia Com Moderator - had Noritz Error 14, now Error code 20 and no hot water

@Rick Herndon,

You will see in the water heater error codes above on this page that the current error code you have means that the heater has turned off on high limit.

I would expect that to mean that the water heater was overheating.

When you say there is no water pressure, which I take to me no water flow at the hot water fixture, that's a separate issue from having hello but water not heating.

That sounds like a blockage or valve that's closed.

On 2022-01-12 by Marc Bilodeau - Le code d'alarme 122 apparait et il n'y a pas d'eau chaude

Bjr j'ai un nrc711-DV depuis printemps 2021

C'est notre première saison hivernale avec ce système de chauffe eau

Le conduit d'alimentation d'air en période froide - 10 celcius ( et plus froid ) est toujours recouvert de condensation

Le code d'alarme 122 apparait et il n'y a pas d'eau chaude

merci de me revenir

On 2022-01-12 by Inspectapedia Com Moderator - Si un conduit d'air est recouvert de condensation, je suspecte deux choses :

@Marc Bilodeau,

Si un conduit d'air est recouvert de condensation, je suspecte deux choses :

1. il y a une forte humidité dans la zone (vérifiez une source d'humidité anormale)
et

2. le conduit doit être isolé et ne l'est pas.

À propos du code d'erreur Noritz 122, ce n'est pas courant, mais Noritz dit que dans ce cas, vous devez les contacter.

Vous ne donnez pas votre position :
Tu pourrais essayer
1-866-766-7489
aux États-Unis ou au Canada.

Aux États-Unis, ce serait le code d'erreur du chauffe-eau Noritz qui ne figure pas dans les données facilement accessibles de l'entreprise et donc pas dans le tableau ci-dessus sur cette page.

Noritz dit que dans ce cas, contactez l'entreprise. Veuillez le faire et faites-moi savoir ce qu'on vous dit car cela aidera d'autres lecteurs.

Noritz Water Heaters, Noritz North America Siège social : 11160 Grace Avenue Fountain Valley, CA 92708 Téléphone : 714-433-2905

On 2021-11-23 by Meryl - error code 71 on Noritz model NRC83-DV

error code 71 on Noritz model NRC83-DV controller showing Error code 71. Not heating water. Unit starts then cuts out.

Does this have anything to do with the controller?

On 2021-11-23 by Inspectapedia Com Moderator - Noritz Error Code 71

@Meryl,

Please the see the Error Codes chart above on this page where Error Code 71 is included.

Let us know if that still leaves you with questions.


On 2021-10-08 by Casey Crane - Noritz ncrc92dv and an error code 63 is flashing

I have a Noritz ncrc92dv and an error code 63 is flashing, what does that mean?

On 2021-10-09 by inspectapedia.com.moderator - Noritz Error Code : 63

@Casey Crane,

Thank you for asking; Noritz doesn't list Error Code 63 in most of its resources, I think because that error doesn't pertain to all Noritz water heaters, but it DOES occur for your model:

Noritz Error Code : 63
for Noritz CONDENSING TANKLESS GAS Water Heater
Models : NRCR111DV (GQ-C3260WXQ-FF US)
NRCR92DV (GQ-C2660WXQ-FF US)

Cause : Recirculation Abnormality

Action :

  • Check return line filter.
  • Check the crossover valve’s filter.
  • Contact Noritz America if there are any other questions.


Source: Noritz CONDENSING GAS WATER HEATER MANUAL NRCR111DV-NRCR92DV [PDF] (2019) Noritz America Corp.,

On 2021-08-08 by Bill - Noritz hot water temperature keeps changing

i have a 7 year old small Noritz and the hot water fluctuates from hot to cold, back to hot, backto cold...

On 2021-08-09 by inspectapedia.com.moderator - Noritz hot water fluctuates from hot to cold

@Bill,

That sounds like a flow rate problem. If the flow rate is too low the heater will shut off and if the flow rate is too high the heater can't keep up.

On 2021-05-29 by Anonymous - Noritz gas tankless heater error code 51

i have a noritz gas tankless heater error code 51 also water leak from unit

On 2021-05-30 by inspectapedia.com.moderator - Noritz gas tankless heater error code 51 + water leak

@Anonymous, Please take a look at the entries for #51 and #59 Noritz error codes in the table above

On 2021-05-22 by CH Jones - older noritz tankless mdl: n-0751M.

I have an older noritz tankless mdl: n-0751M. I am getting Noritz error code 66 which is "Heater Flow Control Valve" problem. My question is "what is the part number for this item?" Thanks in advance.

On 2021-05-30 by inspectapedia.com.moderator - Noritz Error Code 66 - heater flow control valve part number

@CH Jones,

Here is an example on eBay


On 2021-04-03 by Gene Higgins - how to fix error code 51 on Noritz

I have a code 51 flashing on my screen what do I need to do

On 2021-04-03 by (mod) - Noritz Code 51: Gas Manifold Solenoid Failure

@Gene Higgins,

Noritz Code 51: Gas Manifold Solenoid Failure

A reader opined that for some models this code means Noritz manifold replacement is needed.

See Error Code 59 as well - above on this page.


On 2021-01-31 by Mike - can't find fix for Noritz Error Code 57

Noritz 57 error code ? Anyone know!!?

On 2021-01-31 by (mod) - Noritz 57 error code ?

Mike

Noritz error code 57 means that the incoming water pressure is too low.

Ask your plumber to check water pressure and flow in your building. Or for more help contact

Noritz Water Heaters, Noritz North America Headquarters: 11160 Grace Avenue Fountain Valley, CA 92708 Phone: 714-433-2905

On 2020-11-29 by Jack

Getting constant cycling and reignition the more I open the tap.
Ultimately ends in what looks like an undocumented error code,

122
*
Any ideas?

On 2020-11-29 - by (mod) -

Jack:

Yes, it's possible to see a Noritz water heater error code that's not in the company's readily-accessible data and so not in the table above on this page.

Noritz says in that case, contact the company. Please do so and let me know what you're told as that will help other readers.

Noritz Water Heaters, Noritz North America Headquarters: 11160 Grace Avenue Fountain Valley, CA 92708 Phone: 714-433-2905


On 2020-10-09 by Han

I was getting code 90 on NCC199DV-NG unit. Yesterday, after I saw this code (90), tried to reset the unit but was not able to do so as before.

When local plumber (recommended by Noritz) came and used handheld remote controller (RC7651M), he was able to reset the water heater computer by going into maintenance mode (3F). but when I tried my remote controller (RC9018M), water heater didn't get reset. What do I need to do?

On 2020-10-10 by (mod) - Noritz error code 90

Han

Watch out: as you probably saw on the page above, error code 90 is described by Noritz as

Combustion gas alert.

Check for proper gas flame color (light blue, yellow tips). Check for blocked flue, dirt on gas burner.

Have a professional check the gas supply pressure.

On 2019-03-21 by Manuel

Water heater runs constantly, not just when using hot water. Water seems very hot

On 2019-03-28 - by (mod) -

Manuel

Either there is a leak and hot water is actually running somewhere or your water heater's control is faulty and UNSAFE.

Watch out: I would TURN OFF the system IMMEDIATELY and call for help from a licensed plumber who is familiar with Noritz water heaters.

On 2019-01-15 by earl

where are the error codes shown on noritz gas water heater?

On 2019-01-28 - by (mod) -

Earl:

Noritz water heater error codes are displayed:

On Noritz water heater models that contain a display window, the error code appears in that window.

On Noritz water heater models that do not include a display window, the error code can appear on the remote control unit such as the two Noritz water heater remote controllers shown below, the Noritz RC-7651-M and the Noritz remote control

Noritz water heater rermote controller RC7651-M cited & discussed at InspectdApedia.com Noritz water heater rermote controller RC-9019M cited & discussed at InspectdApedia.com

On 2018-10-12 by Anonymous

What is the problem when error code is 51 blinking

On 2018-10-13 - by (mod) - Noritz Error Code 51 - gas manifold solenoid failure

Anon

As in the table above I suspect this code might be model-specific such as the Noritz Model NRC 98-OD.

On some Noritz models error Code 51: Gas Manifold Solenoid Failure

Please take a look at the data tag on your heater, attach a sharp photo of it as an image you can add to a comment, or just tell me the model number and I will dig into this further.



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