Question about Noritz Residential Heaters Tankless Water Heater N-0631S-OD-LP

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Where is the flame sensor located on noritz model #N-0631S and how do you clean it?

Posted by Anonymous on

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Posted on Jan 02, 2017

heatman101
  • 43501 Answers

SOURCE: have hot water for a

Hi,
The problem may be the flame sensor or the control.....
Check that the flame sensor is clean and also that there is a good ground from the burner to the control....make sure that the wiring to the unit is correct polarity, and then the ground is hooked properly also...
Is it flashing a code and if so, check what the code means....

heatman101

Posted on Dec 21, 2010

senor8
  • 73 Answers

SOURCE: How do I manually change

There are temperature jumper clips located on the inside left wall of the heater. They will be in a small plastic baggie. The procedure is as follows:

1. disconnect power
2. install the jumper connector in the plastic slot located between the remote control screws on the circuit board (right hand side of the heater)
3. reconnect power

Posted on Apr 29, 2011

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2 Answers

Is it safe to replace the blown fuse which serves only my small hot water system?


fuses wear out over time even if you dont have short to cause it to blow. yes you can replace the fuse,just be sure to off the power to the box before you do.

Jan 04, 2013 | Water Heaters

1 Answer

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...

1 Answer

How do I manually change the temperature on Noritz N-0631S tankless water heater if I don't have the optional remote controler?


There are temperature jumper clips located on the inside left wall of the heater. They will be in a small plastic baggie. The procedure is as follows:

1. disconnect power
2. install the jumper connector in the plastic slot located between the remote control screws on the circuit board (right hand side of the heater)
3. reconnect power

Mar 06, 2011 | Noritz Residential Heaters Tankless Water...

1 Answer

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

My Noritz N-084M-NG residential/commercial indoor/outdoor Hot Water Heater does not heat the water when I get up in the morning. I have to go and switch it on and off again to get it to heat the...


That unit has two flow sensors. It needs to register flow through both sensors in order for it to fire. If one of the flow sensors is stuck or if there is scale blocking flow through the heat exchanger, it will not fire. I'd recommend contacting a servicer to clean the unit.

May 21, 2010 | Noritz 8.4 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...

2 Answers

Won't Turn on.


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

May 29, 2009 | Noritz 6.3 Gallon Residential Tankless...

3 Answers

Water Heater Won't Fire up


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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Feb 15, 2009 | Noritz 6.3 Gallon Residential Tankless...

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