Navien Tankless Water Heater Error Code Diagnostic

Navien Tankless Water Heater Error Code Diagnostic

Error Code Look-Up – Navien Tankless Water Heater  

Navien-error-codes

Navien-error-codes

If you have a tankless hot water heater set up in your house, you’ve made a sensible investment that will provide endless warm water for several years with proper upkeep. Modern tankless water heaters require far less in the way of upkeep and maintenance than traditional water heaters. They do still have actually that needed maintenance and will sometimes have mistakes that require attention. South End Pipes services all brands, but for this article we’re concentrating on our home brand name, Navien tankless hot water heater repairing due to the fact that the self diagnostics tool supplies codes that makes it easier to identify issues.

There’s a reason we bring and install Navien tankless water heaters. Navien tankless water heaters are self diagnosing, indicating it is geared up with a self-diagnostic tool that continuously keeps track of if the unit is not functioning appropriately. When fault runs out tolerance, the system displays a mistake code. Using the Navien this tankless water heater error code guide, you can quickly determine what the problem is and if you require a plumbing professional to service the system or if it can be fixed on your own.

Navien Tankless Water Heater Error Codes

Error Code E003
What it Means: Ignition failure in your tankless water heater.
How to Fix: Confirm the main gas supply valve is open.

Error Code E004
What it Means: False flame detection.
How to Fix: Confirm properly grounded electrical cord.

What it Means: Flame loss.
How to Fix: Confirm properly grounded electrical cord. Inspect and clean intake air filter.

Error Code E016
What it Means: Overheated heat exchanger.
How to Fix: Turn off the water heater for 30 minutes and restart. Inspect and clean the filter in cold water inlet. Flush the heat exchanger.


Error Code E030
What it Means: Exhaust overheating. The unit will shut down when the temperature in the flue exceeds 149° Fahrenheit (65° Celcius).
How to Fix: Turn off the water heater for 30 minutes and restart. Inspect and clean the filter in cold water inlet. Flush the heat exchanger.


Error Code E046
What it Means: Abnormality in limit control.
How to Fix: Call technical support (800-519-8794).


Error Code E047
What it Means: Abnormality in exhaust thermostat.
How to Fix: Call technical support (800-519-8794).


Error Code E060
What it Means: Abnormality in dual venturi.
How to Fix: Call technical support (800-519-8794).

Error Code E109
What it Means: Abnormality in fan motor.
How to Fix: Inspect and clean the intake air filter.

Error Code E110
What it Means: Abnormality in air pressure.
How to Fix: Confirm there are no obstructions in the exhaust pipe. Inspect and clean intake air filter.


Error Code E407
What it Means: Thermistor open or short circuited (hot water outlet).
How to Fix: Call technical support (800-519-8794).

Error Code E421
What it Means: Thermistor open or short circuited (cold water inlet 1).
How to Fix: Call technical support (800-519-8794).

Error Code E432
What it Means: Thermistor open or short circuited (cold water inlet 2).
How to Fix: Call technical support (800-519-8794).

Error Code E434
What it Means: Abnormality in water adjustment valve.
How to Fix: Call technical support (800-519-8794).

Error Code E438
What it Means: Abnormality in circulation pump.
How to Fix: Confirm all water supply and return lines are open. Check direction of the internal 2-way valve.

Error Code E439
What it Means: Abnormality in flow sensor.
How to Fix: Call technical support (800-519-8794).

What it Means: Thermistor open or short circuited (hot water inlet 2).
How to Fix: Call technical support (800-519-8794).

Error Code E445
What it Means: Abnormality in bypass mixing valve.
How to Fix: Call technical support (800-519-8794).

Error Code E515
What it Means: Abnormality in PCB.
How to Fix: Confirm proper grounding of electrical cord.

Error Code E517
What it Means: Abnormality in DIP switch setting.
How to Fix: Call technical support (800-519-8794).

Error Code E593
What it Means: Abnormality in front panel key.
How to Fix: Call technical support (800-519-8794).

Error Code E615
What it Means: Abnormality in input and memory.
How to Fix: Call technical support (800-519-8794).

Error Code E736
What it Means: Abnormality in cascade communication.
How to Fix: Call technical support (800-519-8794).

Error Code E740
What it Means: Abnormality in outdoor temperature sensor.
How to Fix: Call technical support (800-519-8794).

Error Code E760
What it Means: Flushing/service alarm.
How to Fix: Call technical support (800-519-8794).

Error Code E782
What it Means: Abnormality in main panel communication.
How to Fix: Call technical support (800-519-8794).

Error Code E785
What it Means: Abnormality in flow switch/sensor.
How to Fix: Call technical support (800-519-8794).

If you have any problems with your tankless even if it’s not a Navien brand, we are just a click away. Also if you would like to upgrade to a Navien tankless water heater – give us a call! South End Plumbing is one of the only companies that will give you a free estimate. We will also move an existing water heater if needed. Call us at 704-919-1722 or fill out the form online to schedule a visit.