Question about Noritz 6.9 Gallon Residential Tankless Water Heater - N-069M

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Noritz f 76 error blinking f 76 and on off light blinking at the same time. Everything works fine turned on and off hot h20 it goes to burner on 120 and then goes back to blinking f 76 after burner turns off.

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F76 is a communication error between two quick connected heaters. To clear the code, disconnect power from both heaters, wait 20 seconds, then reconnect power.

Posted on Jul 15, 2010

  • Chris Sellers
    Chris Sellers Aug 04, 2010

    I forgot to add, a quick connect system consists of three parts and three parts only:

    1) two tankless heaters (NR98 and above)
    2) One quick connect cable
    3) One remote control

    People often make the mistake of installing two remotes. A quick connect system only requires one in order to operate properly.


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Noritz Boiler NH-1501-DV-NG Shuts off at radom times with blinking error code 123


error code 123 is a flame rod sensor problem. Chances are the flame rod is sending a weak signal to the control unit. Check for a loose flame rod electrical connector. Peek in the flame inspection windows to ensure there is a proper flame on that side of the burner. If non of the above then try removing the flame rod and cleaning with 400 grit sandpaper or replace it with part order # SKC7448 (called an Ignition plug ELV & Packing EHK SETV)

Dec 16, 2012 | Noritz NH150-DV-NG Indoor Direct Vent...

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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...

2 Answers

After water to house was shut off, my Noritz tankless water heater is on but won't produce hot water. On the unit, the light indicating that the burner is on stays off now.


you probably had debris get into the filter or flow sensor when the water was turned back on. I'd recommend checking the filter first and if that doesn't work, call Noritz Tech support to help you with the flow sensor.

the filter is a black plug located on the cold water line (labeled cold on the bottom of the unit). It points torwards the left.

Apr 14, 2010 | Noritz 7.1 Gpm Natural Ng Gas Tankless Hot...

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

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

2 Answers

Trouble light bilnks 3 times pause and then repeats


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.

Jan 28, 2009 | Noritz 6.3 Gallon Residential Tankless...

1 Answer

Noritz not staying hot


How many faucets do you have on when this happens? Turn on more than 1 and if it still does the samt thing than I would check to see if the inlet water screen has debris in it. Valve off the unit and look at the inlet water side and theres a screeen that you should be able to remove and clean undeneith some running water and then replace. Good Luck

Jan 07, 2009 | Noritz 7.1 Gpm Natural Ng Gas Tankless Hot...

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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