Noritz 6.9 Gallon Residential Direct Vent Tankless Water Heater - N Logo
Posted on Nov 01, 2009
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Panel is flashing a 20 code and water is ice cold. Unable to reset system from control panel.

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  • Posted on Apr 05, 2010
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I was just told by Noritz America that flashing 20 is hard water issues. Any confirmation on just what this error code means?

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  • Posted on Nov 01, 2009
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Diaphrapm valve or micro switch best of luck

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