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

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Noritz Tankless error code 16

I also have a Noritz tankless with the error code 16 problem. Tried flushing it with diluted CLR for 90 minutes but it did not help. Know what else it could be?

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  • Ann Chapin
    Ann Chapin Dec 09, 2009

    No, flushing with CLR had no effect. It turns out that the connection internally in the unit from the pipe that controlls the mixture of gas and air was loose, causing an improper mixture and the heating to be too hot. Nothing to do with the filter and screen.

  • Victor Malabanan
    Victor Malabanan Aug 14, 2014

    which controls the mixture of gas and air . where can I find it?is it in the main gas solenoid valve?

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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?

Posted on Dec 09, 2009

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