Navien NPE-240A Problems and How to Fix Them
However, like any other appliance, the Navien NPE-240A may encounter some problems from time to time. In this blog post, we will discuss some of the common Navien NPE-240A problems and how to fix them.
Navien NPE-240A is a condensing tankless water heater that delivers an endless supply of hot water for up to 3 bathrooms. It has a high efficiency rating of 0.97 and a low NOx emission level of 14 ppm. It also features an internal recirculation pump that provides faster hot water delivery and reduces water waste.
However, like any other appliance, the Navien NPE-240A may encounter some problems from time to time. In this blog post, we will discuss some of the common Navien NPE-240A problems and how to fix them.
Table of Contents
One of the ways to troubleshoot the Navien NPE-240A is to check the error codes displayed on the front panel. The error codes indicate the type and location of the problem and help you identify the possible causes and solutions.
Here are some of the common Navien NPE-240A error codes and their meanings:
- E001: Water pressure sensor error
- E002: Low water pressure
- E003: Ignition failure
- E004: False flame detection
- E012: Flame loss
- E016: Overheating of heat exchanger
- E021: Cold water inlet temperature sensor error
- E022: Hot water outlet temperature sensor error
- E030: Exhaust temperature sensor error
- E032: Fan motor abnormality
- E035: Circulation pump abnormality
- E036: Communication error between main PCB and front panel PCB
- E037: Water adjustment valve abnormality
- E038: Water leakage detected
- E110: Air intake pipe blockage or exhaust pipe blockage
- E351: Hot water outlet temperature sensor open or short
To reset the error code, press the reset button on the front panel for 2 seconds. If the error code persists, contact a qualified service technician.
One of the most common Navien NPE-240A problems is no hot water. There are several possible causes for this problem, such as:
- Low gas pressure or gas supply interruption
- Low water pressure or water supply interruption
- Faulty water flow sensor or water adjustment valve
- Faulty ignition system or flame sensor
- Faulty heat exchanger or temperature sensors
- Faulty recirculation pump or dip switch settings
To fix this problem, you need to check the following:
To ensure that your gas-powered water heater is working properly, there are a few important things to check. First, make sure that the gas valve is fully open and that there are no leaks or blockages in the gas line.
Next, check that the water valve is also fully open and that there are no leaks or blockages in the water line.
It’s also important to make sure that the water flow sensor and water adjustment valve are working correctly and that there is no debris or scale buildup in them. This will ensure that the water temperature is regulated properly and that you have a consistent supply of hot water.
Additionally, check that the ignition system and flame sensor are working properly and that there is no dirt or moisture in them. This will ensure that the burner ignites reliably and stays lit to heat the water.
Another key component to check is the heat exchanger and temperature sensors. These should be functioning correctly, with no scale buildup or corrosion, to ensure efficient heat transfer and accurate temperature readings.
Finally, make sure that the recirculation pump is working correctly and that the dip switch settings are correct for your installation type. This will ensure that hot water is circulated efficiently throughout your plumbing system, reducing wait times and water waste.
By checking and maintaining these components, you can ensure that your gas-powered water heater operates safely and efficiently.
Another common Navien NPE-240A problem is poor water flow. This problem may be caused by:
- Low water pressure or water supply interruption
- Faulty water flow sensor or water adjustment valve
- Clogged inlet filter or shower head
- Faulty recirculation pump or dip switch settings
To fix this problem, you need to check the following:
- Make sure that the water valve is fully open and that there is no water leak or blockage in the water line.
- Make sure that the water flow sensor and water adjustment valve are working properly and that there is no debris or scale buildup in them.
- Clean the inlet filter and shower head regularly and remove any dirt or scale buildup in them.
- Make sure that the recirculation pump is working properly and that the dip switch settings are correct for your installation type.
If you cannot fix the problem by yourself, contact a qualified service technician.
PE-240A has an internal recirculation pump that provides faster hot water delivery and reduces water waste. The internal recirculation pump can be activated by using one of the following methods:
HotButton
This is a wireless device that can be installed near a faucet or shower. When pressed, it sends a signal to the water heater to start the recirculation pump and preheat the water in the pipes. This way, you can get hot water instantly when you turn on the faucet or shower.
Intelligent Preheating
This is a feature that learns your hot water usage patterns and automatically activates the recirculation pump at the times when you usually need hot water. This way, you can have hot water ready when you need it without wasting energy or water.
Weekly Schedule
This is a feature that allows you to set a specific time and day for the recirculation pump to run. You can choose from 1 day, 3 day or 7 day options and customize the start and end time for each day. This way, you can have hot water available at your preferred times.
To use the internal recirculation pump, you need to set the dip switch settings on the water heater according to your installation type.
There are four types of installation:
- Type A: No dedicated return line and no external pump
- Type B: Dedicated return line and no external pump
- Type C: No dedicated return line and external pump
- Type D: Dedicated return line and external pump
The dip switch settings for each type are shown in the table below:
| Installation Type | Dip Switch 1 | Dip Switch 2 | Dip Switch 3 |
|---|---|---|---|
| Type A | ON | OFF | OFF |
| Type B | ON | ON | OFF |
| Type C | OFF | OFF | ON |
| Type D | OFF | ON | ON |
To change the dip switch settings, you need to remove the front cover of the water heater and locate the dip switch panel on the main PCB board. Use a small screwdriver or a pen to flip the switches to the desired position.
After setting the dip switch settings, you need to select the recirculation mode on the front panel of the water heater. You can choose from No Recirculation, Internal Recirculation or External Recirculation.
Then, you need to select the recirculation loop from Always On, Intelligent or Weekly. You can also adjust the recirculation temperature and duration according to your preference.
For more details on how to set up and use the internal recirculation pump, please refer to the user manual or contact Navien customer service.
The heat exchanger is the core component of the Navien NPE-240A that transfers heat from the gas burner to the water. The heat exchanger is made of stainless steel and has a high resistance to corrosion and scale buildup. However, some factors may affect the performance and lifespan of the heat exchanger, such as:
- Poor water quality
- Improper installation
- Improper venting
- Lack of maintenance
Overheating
This may be caused by low water flow, high water temperature, scale buildup or air in the system. This may result in error codes E016 or E110 and damage to the heat exchanger or other components. To prevent overheating, you need to check the water pressure, water temperature, water quality and venting system regularly and perform descaling if needed.
Leaking
This may be caused by corrosion, cracks or loose connections in the heat exchanger or piping. This may result in error code E038 and water damage to the unit or surrounding area. To prevent leaking, you need to check the water quality, install a water filter and a pressure reducing valve if needed and inspect the heat exchanger and piping for any signs of leakage.
Freezing
This may be caused by low ambient temperature, power outage or improper installation. This may result in cracking or bursting of the heat exchanger or piping. To prevent freezing, you need to install the unit in a frost-free area, use antifreeze solution if needed and follow the winterization procedure if the unit is not in use for a long time.
If you suspect any problems with the heat exchanger, you need to contact a qualified service technician for diagnosis and repair. Do not attempt to repair the heat exchanger by yourself as it may void the warranty and cause serious injury or damage.
Conclusion
The Navien NPE-240A is a high-quality and high-efficiency tankless water heater that can provide you with endless hot water for your home. However, like any other appliance, it may encounter some problems from time to time that require troubleshooting and fixing. In this blog post, we have discussed some of the common Navien NPE-240A problems and how to fix them, such as:
- Error codes and their meanings
- No hot water or poor water flow
- Internal recirculation pump settings and issues
- Heat exchanger overheating, leaking or freezing
