How to fix Navien e439 Error Code.

If you have been facing the Navien e439 Error Code on your Navien water heater, then you are at the right place. The error code e439 shows up due to the low water flow issue caused by a clogged inlet screen.

Fixing Navien e439 Error Code

Since removing this error code needs cleaning of the Clogged inlet, so you need some tools to open the affected Navien Water Heater. Here are the list of the tools necessary to do so.

 

Tools and Materials Needed to Fix Navien Error Codes:

• Screwdriver (Phillips or flat-head, depending on your heater model)
• Bucket or towel (to catch any residual water)
• Soft brush or cloth (for cleaning)
• Replacement inlet screen (if necessary

Step-by-Step Instructions to fix Navien Error Code e439:

Step 1: Safety First

1. Turn Off the Power:
   • Locate the power switch for the water heater and turn it off.
   • Unplug the unit or turn off the circuit breaker to ensure safety.
2. Turn Off the Water Supply:
   • Shut off the main water supply to the heater to prevent any leaks.

Step 2: Locate the Inlet Screen

1. Access the Heater:
   • Remove any outer panels or covers to access the inlet valve and screen. This may require unscrewing screws.
2. Find the Inlet Screen:
   • The inlet screen is usually located near the water inlet valve. Refer to your user manual for the exact location.

Step 3: Remove the Inlet Screen

1. Detach the Screen:
   • Carefully unscrew or detach the inlet screen from the valve. Be cautious to avoid damaging any components.
2. Inspect for Clogs:
   • Check the screen for any debris, sediment, or clogs. If it appears dirty or blocked, it will need cleaning.

Also Read: Navien Error Codes

Step 4: Clean the Inlet Screen

1. Clean with a Brush:
   • Use a soft brush or cloth to gently scrub the inlet screen. You can also rinse it under warm water to remove any stubborn debris.
2. Inspect for Damage:
   • After cleaning, inspect the screen for any signs of damage. If it’s cracked or severely clogged, consider replacing it.

Step 5: Reassemble the Heater

1. Reattach the Inlet Screen:
   • Once clean, securely reattach the inlet screen to the water inlet valve. Ensure it is tightened properly to avoid leaks.
2. Replace Any Covers:
   • Reattach any outer panels or covers that were removed to access the inlet screen.

Step 6: Restore Water and Power

1. Turn On the Water Supply:
   • Slowly turn the main water supply back on and check for any leaks around the inlet screen.
2. Restore Power:
   • Plug in the unit or turn on the circuit breaker to restore power to the water heater.

Step 7: Test the Water Heater

1. Check for Error Code:
   • Turn on a hot water tap to allow the water heater to operate. Monitor the display for any error codes.
2. Confirm Normal Operation:
   • Ensure that the heater operates normally and that hot water is being supplied without issues.

Navien Error Codes with Detailed Description:

These Details have been gathered from the official Navien Water Heater support page.

ERROR CODE	REASON	Self-diagnostics/ Action	Reset
Navien Error Code E001	Water is boiling inside the heat exchanger	Clean the inlet water filter Check the heat exchanger; flush it with a cleaning solution	Manual
Navien Error Code E002	Low water pressure	Wait until the water supplement is terminated.	Automatic
Navien Error Code E003	Ignition failure	Check if the main gas supply valve is open Check the igniter for spark	Manual
Navien Error Code E004	False flame detection	Check if the main gas supply valve is open Check the igniter for spark	Automatic
Navien Error Code E005	Heating supply outlet: Thermistor–open	Ensure the ground wire is connected Check the igniter for spark	Automatic
Navien Error Code E006	Heating supply outlet: Thermistor–short	Check the thermistor Check for loose connection Replace the thermistor	Automatic
Navien Error Code E007	Hot water outlet: Thermistor–open	Check the thermistor Check for loose connection Replace the thermistor	Automatic
Navien Error Code E008	Hot water outlet: Thermistor–short	Check the thermistor Look for short or water in connection Replace the thermistor	Automatic
Navien Error Code E09	Abnormal fan motor activity	Check and clean the air filter Check and clean the fan motor Check the tower on board for loose connection	Manual
Navien Error Code E010	Abnormal air pressure	Check the vent and fresh air pipe for obstructions Check and clean the air filter Check hoses and condensate drain	Manual
Navien Error Code E011	High water pressure	Check the water pressure sensor	Automatic
Navien Error Code E012	Flame loss	Check the main gas line (valve open?) Check the intake air pipe Check ground wire Check power supply Clean flame rod	Manual
Navien Error Code E013	Abnormal pump	Check the pump Remove air from the pipe	Manual
Navien Error Code E015	Abnormal control board	Check power supply Check the Emergency Switch	Manual
Navien Error Code E016	Overheating of heat exchanger	Turn OFF the system for at least 30 minutes then restart Clean the inlet water filter Check the heat exchanger; flush with a cleaning solution	Manual
Navien Error Code E018	Heating return inlet: Thermistor–open	Check the Thermistor Check for loose connection Replace the Thermistor	Automatic
Navien Error Code E019	Heating return inlet: Thermistor–short	Check the Thermistor Check for short or water in connection Replace the Thermistor	Automatic
Navien Error Code E021	Cold water inlet: Thermistor–open	Check the Thermistor Check for loose connection Replace the Thermistor	Automatic
Navien Error Code E022	Cold water inlet: Thermistor–short	Check the Thermistor Check for short or water in connection Replace the Thermistor	Automatic
Navien Error Code E027	Abnormal activity of the air pressure sensor	Check the vent pipe for obstructions Check and clean the air filter	Automatic
Navien Error Code E028	Water leak pipeline	Check pipeline.	Manual
Navien Error Code E030	Exhaust Overheat: exhaust high limit the switch shuts down the unit when the flue temperature exceeds 149°F (65°C)	Clean the inlet water filter Check the heat exchanger; flush it with a cleaning solution	Automatic
Navien Error Code E035	Abnormal activity of the gas pressure sensor	Measure gas pressure drop Check hose connection Replace GPS.	Manual
Navien Error Code E036	Communication failure	Contact Navien tech. dept.	Automatic
Navien Error Code E039	Abnormal the Water Flow Sensor	Check the water flow sensor.	Manual
Navien Error Code E040	Outdoor: Thermistor–short	Check the Thermistor Replace the Thermistor	Manual
Navien Error Code E048	Abnormal LPG Gas Pressure	Check the LPG Gas. Fill the LPG Gas.	Manual

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Additional Tips to Fix Navien Error Codes:

• Regular Maintenance: To prevent future clogs, consider performing regular maintenance on your water heater, including cleaning the inlet screen periodically.
• Monitor Water Quality: If you frequently encounter clogs, investigate the water quality in your area, as sediment-heavy water can lead to more frequent issues.

By following these steps, you should be able to resolve the Navien e439 error code and restore normal function to your Navien water heater. If the problem persists, consider contacting a professional technician for further assistance.