Navien tankless water heaters are trusted for their efficiency and cutting-edge technology, making them a top choice for homeowners looking to reduce energy bills and enjoy endless hot water. But even the most reliable systems can face technical issues. Understanding when to perform basic troubleshooting and when to call tech support can save you both time and money.
TLDR: Quick Summary
Navien water heaters are efficient and typically reliable, but occasional issues can arise. Many problems can be resolved through basic troubleshooting like resetting the unit or cleaning filters. However, if you’re experiencing persistent error codes, water leaks, or inconsistent temperatures, it’s time to contact tech support. Don’t attempt complex repairs without professional guidance to avoid damaging your system or voiding the warranty.
Common Issues Users Encounter
Like any advanced appliance, Navien water heaters can run into a range of issues. Here are some of the most common problems homeowners face:
- Error Codes: Display panel shows codes like “E003” or “E110.”
- No Hot Water: Faucets producing cold or lukewarm water.
- Water Temperature Fluctuations: Sudden changes in hot water temperature.
- Unusual Noises: Banging, gurgling, or high-pitched sounds.
- Water Leaks: Dripping around connections or the unit itself.
Basic Troubleshooting You Can Try First
Before reaching for the phone, try these simple troubleshooting steps. You might be able to resolve the problem without professional assistance.
1. Check Power and Gas Supply
Ensure the unit is plugged in and receiving power. For gas-powered units, make sure the gas valve is open. If you’ve recently had a power outage, a simple reset might solve the issue.
2. Reset the Unit
Most Navien models have a reset button. Press and hold it for several seconds. This often clears transient error codes and gets the unit back online.
3. Clean the Inlet Water Filter
Mineral deposits or debris in the water supply can clog the inlet filter. Turn off the water supply to the unit, remove the filter, clean it thoroughly, and reattach.
4. Check the Venting System
Blocked vents can restrict airflow and trigger error codes like E110. Inspect the intake and exhaust pipes to ensure they are free from obstructions like bird nests or debris.
When It’s Time to Call Tech Support
Some issues are indicators of deeper problems that require the attention of a trained technician. Here’s when things are best left to the experts:
1. Persistent Error Codes
Occasional error codes can be harmless, but persistent or repeating codes—especially those related to sensors, combustion, or venting—can point to serious internal issues. Here are a few critical ones:
- E003: Ignition failure.
- E110: Exhaust overheating—could signal poor ventilation.
- E351: Abnormal pressure—often related to the circulation pump.
If resetting doesn’t clear these error codes, it’s time to get professional help.
2. Inconsistent Water Temperatures
If your water temperature fluctuates or fails to reach the desired heat consistently, it could be a sign of an issue with the flow sensor, heat exchanger, or mixing valve. These components can’t be easily fixed without diagnostic tools and training.
3. Water Leaks
Leaking can indicate a compromised internal component such as a cracked heat exchanger or faulty connection in the plumbing. In these scenarios, it’s critical to:
- Shut off the water supply.
- Turn off the unit to prevent further damage.
- Contact Navien’s tech support or a certified plumber.
4. Burner or Flame Issues
If you notice the unit struggling to ignite or staying on for only brief periods, the burner assembly may be dirty or faulty. This is not a DIY task—the burner area contains sensitive components requiring careful handling.
5. Gas Smell or Carbon Monoxide Alerts
If you suspect a gas leak or your carbon monoxide detector goes off, evacuate the area immediately and contact emergency services. Once safe, follow up with Navien-certified tech support. These are urgent safety concerns, not just usability issues.
How to Contact Navien Tech Support
When calling for help, be prepared to supply the following information:
- Model and Serial Number: Typically found on a label on the side or bottom of the unit.
- Error Codes (if any): Take note of what’s shown on the display panel.
- Description of Problem: Include any noises, smells, or performance issues.
- Steps You’ve Taken: Let them know if you’ve already tried to reset, clean filters, etc.
Navien’s official tech support number in North America is 1-800-519-8794. You can also reach them through their support website to chat or schedule a service visit.
Preventative Maintenance Tips
To minimize the chances of major issues, adopt these maintenance practices routinely:
- Flush the System: Once or twice a year, perform a vinegar flush to remove scale from the heat exchanger.
- Clean Filters: Check inlet and air filters every few months and clean as needed.
- Inspect the Venting: Ensure that vent pipes are securely attached and unobstructed.
- Schedule Annual Servicing: A professional technician can perform a comprehensive check to prevent failures.
Warranty and Tech Support Coverage
Navien units typically come with a limited warranty of up to 15 years on the heat exchanger and shorter durations for other components. To make full use of your warranty:
- Register the product shortly after purchase.
- Use only Navien-certified technicians for repairs.
- Keep records of maintenance and service visits.
Attempting unauthorized repairs can void your warranty, so it’s always safer to involve professionals for major issues.
Conclusion: Know Your Limits
While it’s empowering to understand basic troubleshooting, knowing when to call Navien tech support is just as critical. You’ll avoid costly mistakes, protect your investment, and restore your home’s comfort faster.
The key takeaway? Try the small fixes, but don’t hesitate to call in help for the big ones. After all, consistent hot water isn’t just a luxury—it’s a necessity.