Verified manufacturer-source collection
Navien Water Heater Error Codes
Choose the code exactly as shown. Meanings and reset procedures can change across model families, display formats and markets.
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E003 Official Navien material describes E003 as Ignition failure. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E003 caution E004 Official Navien material describes E004 as False flame detection. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E004 caution E012 Official Navien material describes E012 as Flame loss. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E012 caution E016 Official Navien material describes E016 as Overheating of the heat exchanger. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E016 caution E030 Official Navien material describes E030 as Exhaust overheating - the water heater shuts down when the flue temperature exceeds 149 degrees F (65 degrees C). This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E030 caution E046 Official Navien material describes E046 as Abnormal operation: limit control. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E046 caution E047 Official Navien material describes E047 as Abnormal operation: exhaust thermostat. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E047 caution E060 Official Navien material describes E060 as Abnormal operation: dual venturi. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E060 caution E109 Official Navien material describes E109 as Abnormal operation: fan motor. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E109 caution E110 Official Navien material describes E110 as Abnormal air pressure. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E110 caution E407 Official Navien material describes E407 as Hot water outlet: thermistor open or short circuit. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E407 caution E421 Official Navien material describes E421 as Cold water inlet 1: thermistor open or short circuit. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E421 caution E432 Official Navien material describes E432 as Cold water inlet 2: thermistor open or short circuit. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E432 caution E434 Official Navien material describes E434 as Abnormal operation: water adjustment valve. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E434 caution E438 Official Navien material describes E438 as Abnormal operation: circulation pump. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E438 caution E439 Official Navien material describes E439 as Abnormal operation: flow sensor. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E439 caution E441 Official Navien material describes E441 as Hot water inlet 2: thermistor open or short circuit. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E441 caution E445 Official Navien material describes E445 as Abnormal operation: bypass mixing valve. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E445 caution E515 Official Navien material describes E515 as Abnormal operation: PCB (printed circuit board). This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E515 caution E517 Official Navien material describes E517 as Abnormal operation: DIP switch setting. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E517 caution E593 Official Navien material describes E593 as Abnormal operation: front panel key. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E593 caution E615 Official Navien material describes E615 as Abnormal operation: input and memory. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E615 caution E736 Official Navien material describes E736 as Abnormal operation: cascade communication. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E736 caution E740 Official Navien material describes E740 as Abnormal operation: outdoor temperature sensor. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E740 caution E760 Official Navien material describes E760 as Flushing/service alarm. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E760 routine E782 Official Navien material describes E782 as Abnormal operation: main panel communication. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E782 caution E785 Official Navien material describes E785 as Abnormal operation: flow switch/sensor. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Search/display variants: E785 caution