Question about Noritz 6.3 Gallon Residential Tankless Water Heater - N-063S

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Trouble light bilnks 3 times pause and then repeats

Me Five I have A Nortiz Model # N-063S I've had mine for about 5 years also trouble light blinks 3 time pauses then repeats it had been running purfect till just now, I fix it by unpluging it and waiting for about 30 seconds, works fine for about a month but this problem is now coming back more often like once a week now? Can somebody help with a permenant fix? My whole house water pressure is fine about 65 psi. But when this happens all the hot water through out the house has low pressure and cold due to my units burner not coming on till I reset it by unplugging it for 30 seconds. help!

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You have a 16 error code, abnormal output temperature. I recommend performing a descale to remove hard water deposits in the heat exchanger. This should resolve your issue.

Posted on Aug 15, 2009

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I hope this helps. Troubleshooting manual!
http://noritz.com/u/installation_manual__n_069m_n_063s.pdf
Copy and paste to http: Good Luck and use caution!

Posted on Jan 28, 2009

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I have a Nortitz natural gas water heater, model #N-063s-1. Acouple of days ago it stopped heating the water. what can I do myself to fix this matter. Thanks, lynnatheana@hotmail.com


There are many reasons a tankless heater will stop heating water. The first thing I would look for is a flashing red light on the burner indicator. The flash break down goes as follows

continuous blinking - typically means ignition failure or the unit is overheating; look for visible water inside the unit, have your gas pressure checked, or check the flame rod/igniter for buildup of debris

three blinks - typically indicates 16 error code; typically resolved by performing a descale

4 or 5 blinks - exotic error codes; for these you should definitely contact Noritz tech support

If there is no flashing light, first check your filter for debris. If the filter is clean, your flow sensor is probably stuck. Again I'd recommend contacting Noritz tech support to help you clean the flow sensor.

Jul 31, 2010 | Noritz 6.3 Gallon Residential Tankless...

1 Answer

I have a nortiz 063-s tankless, and it won't stay on...I'm thinking it's the computer, please help


There are several things I would look for:
-Flashing burner light (indicates an error code)
-Trying flowing more hot water. In the summer alot of times you'll flow less hot water because your cold water is warmer. If you flow additional hot water at your shower, it will ensure the unit stays firing
-If the unit doesn't fire at all, you may have debris in your cold water filter or a stuck flow sensor. Call tech support to help you with cleaning a flow sensor.

May 29, 2010 | Noritz 6.3 Gallon Residential Tankless...

1 Answer

Will not try to lite


1) First make sure you are getting power into the unit.
2) Then check for any visible water inside the unit which might indicate a leak.
3) The third possibility is the flow sensor being stuck. Try opening a large flow of water (bath tub, two sinks and shower) and see if the unit fires. Otherwise you may want to contact a servicer to clean this component.

May 27, 2010 | Noritz 6.3 Gallon Residential Tankless...

1 Answer

3 red blinks


sounds like you are getting an ignition failure code. Check the inside of the unit for evidence of a leaking HEX.

Jan 31, 2010 | Noritz 6.3 Gallon Residential Tankless...

1 Answer

Noritz remote controller "RC-7646m-1" seems to need to be restarted several times throughout the day. Usually what happens is out of nowhere, it'll just lose it's temperature reading (at usually 140), and...


You are actually getting a 90 error code. This error code occurs if the unit is dirty and overheating. I'd recommend contacting a servicer to clean your heater with compressed air. They'll need to remove the fan motor and manifold plate to fully clean the burner chamber and heat exchanger.

Jan 21, 2010 | Noritz 6.3 Gallon Residential Tankless...

1 Answer

I have a noritz water tankless heater and hot water stopped. Red light blinking three times. Need help.


Three flashes typically indicates the unit is overheating due to scale. I'd try a descale initially and see if that remedies the problem.

Dec 27, 2009 | Noritz 6.3 Gallon Residential Tankless...

1 Answer

The power light on my Noritz hot water heat is blinking and the burner light will not stay on.


what the error code on the unit? if you hold the up and down arrow keys and scroll to the number 90-99 it will give you the codes, or call nortiz and they will walk you through the diagnostics

Aug 15, 2009 | Water Heaters

1 Answer

Nortiz model n132m tankless water heater is flashing code 14


My guess it need reset.Turn power off for five to ten minutes and try that.The heat may have mis fired for the code.

Mar 15, 2009 | Water Heaters

4 Answers

Heater not working


Probably a 12 or 21 code. Neither of which a Consumer can do ANYTHING about. Call Noritz 1-888-382-6568 and they will have a Regional Service/Repair Field Engineer call you and diagnose problem.
This is a sophisticated appliance unserviceable to Consumer but you may diagnose it with the help of the FE for Service Contractor to repair.
N069M-DV was discontinued 3 years ago replaced by N0751M-DV. Have you checked the inlet filter since you bought it? Is it on good soft water? It's a strong pretty dependable unit IF INSTALLED PROPERLY and MAINTAINED.

Mar 02, 2009 | Noritz 6.9 Gallon Residential Direct Vent...

2 Answers

Blinking red light,


It seams alot of people have this same problem All must get ahold of manufacturer and report this it must be there pump's thank you for useing fixya

Jan 14, 2009 | Noritz 6.3 Gallon Residential Tankless...

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