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Navien Appliance Error Codes
Navien tankless water heaters and boilers for residential and commercial applications use innovative high efficiency technology to provide a comfortable environment.
Water Heater Error Codes
CODE: E003
PROBLEM: Ignition failure in your tankless water heater.
FIX: Confirm the main gas supply valve is open.
CODE: E004
PROBLEM: False flame detection.
FIX: Confirm properly grounded electrical cord.
CODE: E012
PROBLEM: Flame loss.
FIX: Confirm properly grounded electrical cord. Inspect and clean intake air filter.
CODE: E016
PROBLEM: Overheated heat exchanger.
FIX: Turn off the water heater for 30 minutes and restart. Inspect and clean the filter in cold water inlet. Flush the heat exchanger.
CODE: E030
PROBLEM: Exhaust overheating. The unit will shut down when the temperature in the flue exceeds 149° Fahrenheit (65° Celcius).
FIX: Turn off the water heater for 30 minutes and restart. Inspect and clean the filter in cold water inlet. Flush the heat exchanger.
CODE: E046
PROBLEM: Abnormality in limit control.
CODE: E047
PROBLEM: Abnormality in exhaust thermostat.
CODE: E060
PROBLEM: Abnormality in dual venturi.
CODE: E109
PROBLEM: Abnormality in fan motor.
FIX: Inspect and clean the intake air filter.
CODE: E110
PROBLEM: Abnormality in air pressure.
FIX: Confirm there are no obstructions in the exhaust pipe. Inspect and clean intake air filter.
CODE: E407
PROBLEM: Thermistor open or short circuited (hot water outlet).
CODE: E421
PROBLEM: Thermistor open or short circuited (cold water inlet 1).
CODE: E432
PROBLEM: Thermistor open or short circuited (cold water inlet 2).
CODE: E434
PROBLEM: Abnormality in water adjustment valve.
CODE: E438
PROBLEM: Abnormality in circulation pump.
FIX: Confirm all water supply and return lines are open. Check direction of the internal 2-way valve.
CODE: E439
PROBLEM: Abnormality in flow sensor.
CODE: E441
PROBLEM: Thermistor open or short circuited (hot water inlet 2).
CODE: E445
PROBLEM: Abnormality in bypass mixing valve.
CODE: E515
PROBLEM: Abnormality in PCB.
FIX: Confirm proper grounding of electrical cord.
CODE: E517
PROBLEM: Abnormality in DIP switch setting.
CODE: E593
PROBLEM: Abnormality in front panel key.
CODE: E615
PROBLEM: Abnormality in input and memory.
CODE: E736
PROBLEM: Abnormality in cascade communication.
CODE: E740
PROBLEM: Abnormality in outdoor temperature sensor.
CODE: E760
PROBLEM: Flushing/service alarm.
CODE: E782
PROBLEM: Abnormality in main panel communication.
CODE: E785
PROBLEM: Abnormality in flow switch/sensor.
Navien Appliance Error Codes
Navien appliance fault codes
Navien appliance diagnostic codes
Navien appliance error symbols
Navien appliance common faults
My family hasn’t noticed any changes since I made the switch to tankless. The installation was extremely simple, more so than other models I have installed in the past. I’m impressed by the easy to read and access front control and just how quiet the NPE model is; it’s nearly silent.
Navien isn't exactly a household name, but it should be. This company is at the forefront of tankless water heater and boiler technology. Owning a Navien tankless water heater means lower bills and a much smaller carbon footprint.
All Navien water heaters receive very high ratings from consumers. In fact, they are among the highest rated from any water heater manufacturer. Some of the characteristics that are mentioned time and again in reviews include the easy installation, energy savings, solid construction (that is easy to maintain), and small size. Consumers also appreciate that hot water arrives to their faucet in just a few seconds or less and that most models run relatively quietly for gas water heaters. The only complaint about Navien water heaters you’ll find is that they are quite expensive, with an average price of around $1,200. This puts the heaters at the high end of the cost scale. However, with their longer lifespan, greater efficiency (which ultimately leads to cost savings), and top-of-the-range technology, many consumers agree that these heaters are a worthwhile investment.
The Navien NPE240S comes with a great conception of a durable body and proper installation option. This also allows the user to have a long life for the product. We found that the product has stainless steel heating elements.
Navien is a solid choice when it comes to tankless water heaters. Their units are manufacturered by a company that takes pride in quality, design, and user friendliness. In fact, there's no shortage of satisfied customers!