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

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Noritz 111 making loud noise when water is on

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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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Very loud foghorn sound

Loud rumbling noises are often caused by either water boiling in the burner or by entrapped air in the system. To help prevent water boiling make sure that the boiler system has a pressure between 15 - 30 psi. Also check for sufficient water flow and remove any sediment from the in-line filter. To remove entrapped air, install an automatic or manual air vent at the highest point in the heating system and also make sure you have a properly working micro-air vent installed. With the unit turned off and cooled down, you can also try flipping the lever on the pressure relief valve to try and flush out any air in the heat exchanger . Hope this helps.

Sep 06, 2014 | Noritz Water Heaters

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Sounds like a truck

If the heater is more then a few years old the heat exchanger is probably corroded. Air flow from the blower motor can't squeeze thru the exchanger fins and causes loud vibrations. It can sometimes be cleaned but usually requires replacement of the heat exchanger. If you are not familiar you should definitely have a professional sevice the unit. Continued use in its current state can cause many other issues. Be prepared because the heat exchanger is the most expensive part of the heater and the most difficult to replace

Jan 10, 2014 | Water Heaters

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My Noritz N-0751 M-DV makes a loud vibrating noise when I first turn on the hot water. I was advised to flush the system and did but the noise is still there

This sounds like "water hammer"
You can fix this by adding an arrester to the water line. here is a link to what they look like and how they work

You may want to check you water pressure and see if its over 80 psi.
If so then your regulator needs to be adjusted or replaced. If you home does not have a regulator and the city has upped the pressure then you will need to install one. water hammer will break pipes over time and can damage that nice water heater you have.

Jan 10, 2013 | Noritz Residential Heaters Tankless Water...

1 Answer

Vibrating when the heater starts to heat water

Things to Check:

1. incoming gas pressure (minimum 5" when unit firing)
2. Make sure damper on top of unit isn't sticking
3. check vent length and #elbows versus installation manual specs
4. if above 2000', disconnect high elevation termination

If these all check out, you'll probably need to do a manifold adjustment. Call Noritz for assitance on this.

Apr 09, 2011 | NORITZ Natural Gas Tankless Water Heater...

1 Answer

Can we change the orfice on our Noritz N-0751M natural gas to liguid propane?

There's a field conversion kit available. Contact Noritz to get more information.

Mar 30, 2011 | Noritz Residential Heaters Tankless Water...

1 Answer


Go over to unit and with somebody else turning on the water listen for the ignition to kick in it will make a tick, tick sound if you dont hear the tick, tick sound you have a faulty igniter. Hope this gets you in the right direction.

Jan 23, 2011 | Noritz 7.1 Gpm Propane Lp Gas Tankless Hot...

1 Answer

How to remove the water filter in Noritz

it's just a cup screen,, when you take off the cap screw you pull it out claen i and put it back,, it is on the cold side only right before the unit connection

Jun 22, 2009 | Noritz 6.9 Gallon Residential Direct Vent...

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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