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

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Noritz tankless gas water heater recirculation system design to reduce hot water time to faucets

I have a N-0631s Noritz tankless gas water heater to supply hot water to my bathroom faucets and shower. During the winter the temperature of from the shower head flucuates when the temperature is only warm. The flow rate for the unit (code:14) during this temperature is 19 to 21. Why is this flucuation hapening? I have flushed/scaled the unit this summer by pumping vinegar through the unit for half an hour with very little scale indicated in the fluid after the flushing. The unit sometimes does not fire up to provide hot water if only one faucet at the sink is turned on. The pipe distance from the tank to shower and faucets is about 12 to 15 feet. What is involved in installing a recircultion system to reduce time for hot water to the faucets?

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Posted on Jan 02, 2017

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SOURCE: 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.

Posted on May 12, 2009

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SOURCE: Noritz tankless water heater/dishwasher not hot enough to clean

You are doing everything you can. Your dishwasher probably isn't drawing enough hot water to activate the unit so opening the faucet and flowing more water will activate the unit. Just try to adjust the flow from the faucet to a point it, plus the draw from the dishwasher, will activate the unit. This will come with trial and error as I am sure you have already experienced. Also, open the dishwasher when it does get filled and check the water temperature. You might have the unit set at a low discharge temperature. Do you have a touchpad to control the water temperature adjustment?

Posted on Jun 10, 2009

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SOURCE: A Noritz 6.3 gal water heater fires then goes out then refires

Check thermocouple , sounds like it's not sensing flame.

Posted on May 12, 2010

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

heatman101
  • 43501 Answers

SOURCE: Noritz tankless gas water heater.

Hi,
The unit is plugged up with mineral buildup from the water going through it... it will need to be cleaned internally....this is done by running an acid solution through it to clean out the mineral buildup...

Then it will work again...

heatman101

Posted on Feb 03, 2011

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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.

Oct 12, 2012 | Noritz NR98-DVC-NG Natural Gas Indoor...

1 Answer

Noritz NR98-DVC tankless water heater won't give hot water thru a single valve fixture. Gives us all the hot water we want on a double handled fixture. Any suggestions on what to do?


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 solve problem long-long term, install tank-type gas water heater from local box store for $350.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

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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

Noritz tankless gas water heater. Hot water pressure is low. Unit does not "click" on when hot water is opened. No hot water.


Hi,
The unit is plugged up with mineral buildup from the water going through it... it will need to be cleaned internally....this is done by running an acid solution through it to clean out the mineral buildup...

Then it will work again...

heatman101

Feb 02, 2011 | Noritz 7.1 Gpm Natural Ng Gas Tankless Hot...

1 Answer

Noritz Tankless error code 16


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/dishwasher not hot enough to clean


You are doing everything you can. Your dishwasher probably isn't drawing enough hot water to activate the unit so opening the faucet and flowing more water will activate the unit. Just try to adjust the flow from the faucet to a point it, plus the draw from the dishwasher, will activate the unit. This will come with trial and error as I am sure you have already experienced. Also, open the dishwasher when it does get filled and check the water temperature. You might have the unit set at a low discharge temperature. Do you have a touchpad to control the water temperature adjustment?

Feb 17, 2009 | Noritz 7.1 Gpm Natural Ng Gas Tankless Hot...

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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