Question about Noritz 6.9 Gallon Residential Direct Vent Tankless Water Heater - N

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I have a N-069M-OD that over the past 4 months will shut off occasionally at anytime and the the power button has to be pushed twice to reset the blinking button. Any answers to resolve this problem ?

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  • fuzzzy65 May 14, 2009

    I turned the temp down to 120 and it had the same problem.

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I have been battling the problem for several months where my hot water will all of a sudden get very hot and then shut off copmpletely. I called the tech support and learned how to use the diagnostic capabilities and found out that my hot water shut off was due to a decrease in flow through the hot water heater. The unit needs at least a 0.7 gpm flow rate for the burner to work properly. When I turned on my cold water along with my hot water I could watch my hot water flow rate slow down to the point that the flow was not enough to work properly. Just to prove it to myself I then turned on a sink hot water faucit while running my shower as if I were taking a shower just to keep up the minimum flow rate and what do yo know............ I had constant flow and constant hot water exactly the temp I had it set for. My problem seems to be with my shower and tub controls. As long as I maintain a 0.7 gpm flow rate my hot water system works great.
Darrell

Posted on Aug 11, 2009

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Water temp setting should be appx 120, any higher heat exchanger trips on overload and you must reset each time..

Posted on May 10, 2009

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Posted on Jan 02, 2017

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1 Answer

N-069m pulsating when hot water is turned off.


Do you have a well our on city water? Check in coming water pressure make sure it is not over 60psi

Sep 14, 2014 | Noritz 6.9 Gallon Residential Tankless...

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Rinnai water heater


It sounds like an internal thermostat failed. I would highly recommend getting a factory qualified repair service to resolve the problem for you.

Jan 16, 2014 | Water Heaters

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Bosch 2.5 gl water heater does not work. there is power to the unit but not action at switch or themostate. is there a high limit switch that can be tripped and rest and where is it


Ariston 2.5ga reset button is located on thermostat.
Following image shows location of reset button:
http://waterheatertimer.org/images/Bosch-Ariston-reset-400.jpg

Open following link for Bosch troubleshooting resources and link to your manual.
Read manual entirely to empower yourself and to avoid-anticipate problems.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Manual says:
Occasionally, the high temperature limit shut off device may trigger and shut the
system down. This occurs when water temperature exceeds 190° F and shuts off
power to the heating element. The shut off device may also trigger from a power
outage or electrical storm.
To reach the thermostat:
1. Pry off the round cover plate (V Fig. 3/1) from its right hand edge (W Fig. 3/1) with
a small flat-head screwdriver.
2. Remove the Phillips screw revealed beneath the round cover plate.
3. The cover (C Fig. 3/1) can now be removed by pulling out its left-hand edge. When
reassembling, work in the opposite way being careful to insert the tongue of the
cover into the slot.
4. Firmly press reset button (B Fig. 4). Reconnect power.
5. IMPORTANT: Check the operation of the thermostat, turn temperature dial from
high to low, if the red light does not go off on low setting, turn off power supply and
call a service person to replace the thermostat.
6. If the system works, place dial setting to desired setting. Note: a lower setting is
more economical and reduces the risk of scalding. Replace cover plate.
CAUTION: Call a technician if the high limit needs to be reset frequently.

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And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
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May 19, 2011 | Bosch Ariston GL2.5 GL2.5 Point-of-Use...

1 Answer

I have a Model N-069M and i get a flashing code 16. I just had the unit flushed two days ago and i still get the same code. thanks for any help


I feel your pain. I am experiencing the same issue which started about 3 weeks ago. First it happened twice that first week and we discounted it. Now that my heater has been flushed the same issue is occuring. I called Noritz 3-4 times now and they are saying that I may have high manollowifold pressure and should have that checked.

FollowUp: Plumber determined my Natural Gas inlet line was too small. He Tee'd off before my manifold to other appliances and fed with a 3/4 line. Issue resolved and it has been trouble free since. (Updated 2/2017)

Feb 12, 2011 | Noritz 6.9 Gallon Residential Tankless...

1 Answer

My gl4 ariston the only way it will heat water is to reset it . It will heat water til it get hot and then you have to reset it to get the water hot again


Occasionally, the high temperature limit shut off device may trigger and shut the

system down. This occurs when water temperature exceeds 190° F and shuts off

power to the heating element. The shut off device may also trigger from a power

outage or electrical storm.

To reach the thermostat:

1. Pry off the round cover plate (V Fig. 3/1) from its right hand edge (W Fig. 3/1) with

a small flat-head screwdriver.

2. Remove the Phillips screw revealed beneath the round cover plate.

3. The cover (C Fig. 3/1) can now be removed by pulling out its left-hand edge. When

reassembling, work in the opposite way being careful to insert the tongue of the

cover into the slot.

4. Firmly press reset button (B Fig. 4). Reconnect power.

5. IMPORTANT: Check the operation of the thermostat, turn temperature dial from

high to low, if the red light does not go off on low setting, turn off power supply and

call a service person to replace the thermostat.

6. If the system works, place dial setting to desired setting. Note: a lower setting is

more economical and reduces the risk of scalding. Replace cover plate.
CAUTION: Call a technician if the high limit needs to be reset frequently.

Sep 24, 2010 | Bosch Ariston GL4 GL4 Point-of-Use...

1 Answer

How do you fix hot water shuts off during shower with Model N-069M-OD installed December 2006?


Try flowing more hot water with your shower. During the summer you end up mixing alot of cold water and very little hot water (because your cold ground water isn't so cold in the summer). When you get close the minimum flow rate of the appliance, it will start to short cycle (fire on and off). Here's some recommended things you can do:

1) Clean the shower head - remove scale deposits and or clogging
2) Widden flow restrictor - most shower heads have a flow restrictor on the back of the showerhead; It consists of a rubber washer with a hole in the center. You can widen the hole using a drill bit.
3) remove the flow restrictor - this should be a last resort

Jul 22, 2010 | Noritz 6.3 Gallon Residential Tankless...

1 Answer

Would you recommend this brand or another, with your experiences. We can get a used one noritz n-069m-od for $250...Go for it or not? We live on a well, 40-70 PSI, so maybe a bit low to work well?


The thing is with these that if they have been used in a "Hard Water" area, they get clogged up inside with deposits, so as long as it's a real "New" looking, inside and out, well I guess $225 - $250 would be an acceptable price. Find out WHY it is being sold.

Apr 17, 2010 | Noritz 6.9 Gallon Residential Direct Vent...

1 Answer

Bosch GL4ti Ariston water heater - have no hot water is it worth fixing or should I replace? Also, is the reset button different from the on/off switch?


Check if unit has power to the plug. If so, could be bad heater element or bad thermostat. Also could be reset button on thermostat and yes, the reset button is different from on/off switch. Element about $38, thermostat about $30 from www.plumbingsupply.com

Occasionally, the high temperature limit shut off device may trigger and shut the

system down. This occurs when water temperature exceeds 190° F and shuts off

power to the heating element. The shut off device may also trigger from a power

outage or electrical storm.

To reach the thermostat:

1. Pry off the round cover plate (V Fig. 3/1) from its right hand edge (W Fig. 3/1) with

a small flat-head screwdriver.

2. Remove the Phillips screw revealed beneath the round cover plate.

3. The cover (C Fig. 3/1) can now be removed by pulling out its left-hand edge. When

reassembling, work in the opposite way being careful to insert the tongue of the

cover into the slot.

4. Firmly press reset button (B Fig. 4). Reconnect power.

5. IMPORTANT: Check the operation of the thermostat, turn temperature dial from

high to low, if the red light does not go off on low setting, turn off power supply and

call a service person to replace the thermostat.

6. If the system works, place dial setting to desired setting. Note: a lower setting is

more economical and reduces the risk of scalding. Replace cover plate.
CAUTION: Call a technician if the high limit needs to be reset frequently.


PlumbingSupply.com has the Ariston repair parts that you need.
ariston-gl2546components.png Diagram # Model # Description Price & Quantity 2 570241 Anode Rod for GL6 and GL8Ti $13.99 2 574305 New Style Anode Rod for GL2.5 and 4.0 $12.95 3 994147 Element Gasket $11.95 4 994140 Element Locknut - 4 Each Req. Per Element - sold each $2.99 5 994103 Element for GL2.5 and GL4.0 $37.95 5 994104 Element for GL6 $39.97 11 65105602
old #994062 Thermostat for GL2.5 and GL4.0 $29.52 11 65150322
old #994102 Thermostat for GL6 $32.57 GL25-4KIT Element, Element Gasket and Anode Rod Kit - For GL2.5Ti & GL4.0Ti $47.65 GL6-8KIT Element, Element Gasket and Anode Rod Kit - For GL6 & GL8Ti $48.65 Note: If you don't see your number unfortunately it is no longer available

Feb 02, 2010 | Bosch GL4Ti Ariston Pro Ti Electric...

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