Question about Noritz Water Heaters

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I have a Noritz N063 tankless hot water heater. I am getting an error code 11. Sometimes it fires up and sometimes it doesn't. It is around 13 years old, and only started giving me trouble.

My service man ordered 3 parts related to the ignition and replaced them. My hot water is still sporadic. The propane is OK. We spoke to two Noritz techs. The first one took us through various steps, when all that worked he passed us on to a senior tech. The service man cleaned the manifold and it did fire up, however it was only temporary. As soon as the service man left it went out again. Any ideas as what might be wrong???

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  • 101 Answers

It could be leaking some where or condensation in the electricals but most hot water nits in my experience start to fail after 10 years

Posted on Dec 03, 2016

  • joellenNC Dec 03, 2016

    Thank you. Which brand do you think is better - Rinnai or Noritz?

  • John Mangan
    John Mangan Dec 03, 2016

    I have never heard of noritz but rinnai is a very reputable brand

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I have a Noritz tankless water heater (model n-132m). I am getting an error code of 71. What does that mean?


The Noritz Manual shows fixed for the following error codes:
11
21
90
99
For all other codes this is the recommendation:
Contact our sales agent if:
• Any other error code appears.

Sep 12, 2014 | Noritz Commerical Tankless Water Heater...

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Have been running extremely hard water thru our Noritz NR98-DVC for a couple of years. Unit is not functioning properly. What, if any, damage could result from using this hard water? Could there be


Replace single-handled faucet cartridge, and see if hot flows to that faucet again.
http://waterheatertimer.org/Crossover.html

Exposing tankless to hard water causes reduced efficiency within a few months, and can cause Total failure of parts within two years.
Do not expose tankless to more than 11 grains hard water.
Here is research pdf conducted by water softener industry comparing tankless andf tank-type:
http://waterheatertimer.org/pdf/Battelle_Final_Report.pdf

To possibly solve problem temporarily, install softening system, delime tankless unit using white vinegar. Delime yearly. It is fun for whole family. And who doesn't like a project schedule.
http://waterheatertimer.org/pdf/Rheem-De-lime-tankless.pdf

To solve problem long-long term, install tank-type gas water heater from local box store for $350.

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1 Answer

What is error code 043 on NORITZ tankless heater?


There is no error 43 on a NR71. There is a 73 error code which is caused by disconnecting jumper cables while the power is on.

Oct 29, 2010 | Noritz 7.1 Gpm Propane Lp Gas Tankless Hot...

1 Answer

My Noritz tankless will sometimes flash 5 red quick lights which indicates to me that it's not firing and I've only succeeded in restarting it at the circuit box. What servicing needs to happen to prevent...


You are getting an error code. A 5 flash error code is typically caused by voltage supply abnormalities. If you are using a generator, battery backup, or solar electricity inverter, make sure it is supplying your heater with a smooth sine wave AC voltage.

This code can also be caused by connecting jumpers inside the unit with power connected or buildup of soot on the sensors

Feb 24, 2010 | Noritz 6.3 Gallon Residential Tankless...

1 Answer

Sometimes the hot water just goes cold


Here are a couple things to look for:

1) flashing burner light - a flashing burner light indicates the unit is getting an error code
common error codes:
A. continuous flashing - ignition failure or abnormal combustion; look for visible water in the machine indicating a leak, check gas pressure, debris or buildup on flame rod/igniter plug, or clean unit with compressed air
B. 3 flashes - error 16, abnormal outlet water temperature; typically this code indicates you'll need to descale you unit
C. 4 or 5 flashes - exotic error codes; you should contact Noritz technical support to deal with these codes

2. If there is no flashing code, try increasing the hot water flow. In the summer time you typically use less hot water; this can result in intermittent operation of your tankless heater. Increase water flow by either: A. cleaning your showerhead and removing scale deposits B. widening your flow restrictor C. Remove your flow restrictor in the showerhead

3.If none of these resolves your problem, you probably have debris in your flow sensor. Contact Noritz technical support for a walkthrough on removing debris from a flow sensor.

Feb 18, 2010 | Noritz 6.3 Gallon Residential Tankless...

1 Answer

Im getting error code 11 and it wont fire


hihpoe i can help check gass valve is open press power button to turn off open hot water fixture and turn back on if this dose not work conntact your dealer best of luck pete

Nov 22, 2009 | Noritz 6.9 Gallon Residential Direct Vent...

1 Answer

Noritz Tankless error code 16


The trick with these hot water heaters is to keep the filter screen clean and flush the system with CLR periodically. Code 11 is ignition error. Is your gas valve turned on?

Oct 17, 2009 | Noritz 6.9 Gallon Residential Direct Vent...

1 Answer

Noritz tankless water heater gives error code 11


This worked for me in the same situation. There is a filter inserted into main gas/ water control valve that senses water flow restriction. The sensor is connected to the gas valve. If it senses inadequate water flow it tells the gas valve to shut down so the water in the heater won't boil. Very expensive part. If you do find the filter clogged, a sediment water filter shoud be install on the inlet side of the water piping.

Oct 12, 2009 | Water Heaters

2 Answers

Noritz tankless water heater not producing hot water


I called Noritz error code 16 is a overheat problem. Noritz say's to flush your coil with vinegar or CLR.
Use a small pump to recirculate the CLR or vinegar through the system for 45 minutes and flush with fresh water. This worked for me.

Jan 04, 2009 | Noritz 6.9 Gallon Residential Direct Vent...

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