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

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Won't Turn on.

My noritz 751m water heater won't turn on. I do not get any codes. I have power to controller. It was starting up once and my sister turn the water off before it got going. It hasn't said anything since. Under the front cover there is no light.

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  • steven_be4 May 29, 2009

    It is natural gas with electric ignition. Unplugged it, waited set the temp. I turned it on, then turn the water on and still won't start up.

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Try pulling the pressure relief located on the hot water outlet of the unit. It sounds like you may have debris in the flow sensor of your heater. Usually the large amount of flow from the pressure relief can dislodge debris, and get your heater firing again. If this doesn't work you'll need to manually clean the flow sensor. I recommend calling Noritz Technical Support to walk you through the procedure.

Posted on Aug 14, 2009

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Did you check your circuit breaker for the outlet you are pluged into, is it electric or gas, for the combustion? if it is electric you might have burned up the element it has to have water on it before turning it on, if it's gas you might just have to unplug it wait 30 seconds plug it in set the temp and turn it on

Posted on May 29, 2009

  • gary miller
    gary miller May 29, 2009

    so it is a regular tank water heater,

  • gary miller
    gary miller May 29, 2009

    I just went to there web site to try and help and i am sorry to tell you but it appears that you will have to have a service tech come out, sorry that i couldn't help but try 1 more thing, when you trun it on turn on the water before you plug it in, so turn it off, completly, turn water on then plug it it set desired temp turn on the water faucet, try it both ways with the faucet on and with it off while turning it on, it appears that there is a circuit that when bad that sends the info to the computer to tell the unit to come on,

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1 Answer

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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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I had the same problem with my Noritz 751M, I called the plumber and after he talked with Noritz and ran a bunch of tests (for $150) he told me I needed a new unit ($4,000 installed). They implied it was my fault cause I never flushed it over 8 years. They were unable to tell me the flow rate though (which should be very low if scale was my main issue). I decided to take over as I am very handy and an engineer. Here is what I found:

1. The unit is 8 years old and was never descaled (orig installer did not install the bypass valves nor tell me to flush annually). So, I installed the valves ($70) and bought a pump/hoses/bucket/Zep CLR ($150) and did the flush. There was tons of flow thru the exchanger (I did not measure how much).

2. I called Noritz myself (they were very helpful) and cleaned up the igniter rod with sandpaper (it was very discolored due to 8 years of sparking). This did the trick and my unit fired up but it was very sporadic (sometimes yes & no). The difficult part is that while the igniter is installed you CANNOT actually see (nor definitively hear) the sparking. It seems like sometimes the spark happens (unit fires right up) and sometimes it doesn't (unit cycles and ends in a Code 11 after a couple of minutes).

3. INFO: Per the field manual (Search google for: docslide.us_noritz-field-manual-2009) you can read the flow rate data from Data #14 on the remote control. It needs to be >0.5 GPM for the sparking to happen which then triggers the gas flow. You can live monitor Data #14 by following the instructions in the field manual on pp.46-47. The startup logic is: Flow > 0.5 GPM then Sparking Happens then the Gas Flows then Flames start in the combustion chamber


4. I got mine to successfully start by loosening the ignitor rod PN 101 and jiggling it while still inserted into the combustion chamber (holding it with insulated pliers while still against the case) - somewhat dangerous and startling when after sparking the gas flows and flaming starts but not too bad.


5. BOTTOMLINE: I got it working but it would not "always" light (even though my flow was always >0.5 GPM). Noritz told me that it is probably because I have the older black ignitor (PN 126 = EHEJ003). They have a new and improved gray ignitor (PN 126 = EMUJ004). I ordered it with a couple of other ignitor parts for a total of $35. I just installed them and they work great - ignition all the time from every faucet.


6. ENDGAME: Order the new ignitor parts, verify your flow rates using the field manual. See the pics below for some insight. I spent 20 hrs troubleshooting and wanted o share. If you want more info just email me at: tmorganjets@gmail.com

You can monitor the flow rate and flame by doing a skype (PC at faucet to Phone place in front of Noritz) - you will be able to see the Noritz turning on (with flow rate displayed) each time you turn on a faucet - it is very helpful for troubleshooting and verification
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1 Answer

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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

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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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