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Noritz 0631x water heater

Sometimes it works, somtimes it doesn't.
Get error code 11.
what could it be?

its driving us crazy!

even the plumber doesnt know what the problem is.

please help!

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The error 11 means ignition failure. It's most typically caused by insufficient or interupted gas supply. If you are on a propane system, check for a sticking gas regulator. Your gas line should be sized according to the Uniform Plumbing Code, and it should have a minimum 3/4" inner diameter on all piping connections.

Posted on Aug 14, 2009

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I guess this a gas heater.You need to look at the manual to find out what code 11 is.It could be misfired or tempture to high.Give me a litte more infor.thanks

Posted on Mar 15, 2009

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1 Answer

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.


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

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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:
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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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a 16 error code is typically caused by scale formation. I'd recommend performing a descale on the heater.

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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.

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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

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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?

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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.

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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.

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