The Navien tankless water heater is known for efficiency and reliable performance, but like any appliance, it may require a reset to clear error codes or restore operation after an interruption. This guide explains where to find the reset button on popular Navien models, when a reset is appropriate, step-by-step instructions to perform it safely, and best practices to reduce future resets.

What The Reset Button Is And When It’s Needed

In Navien tankless systems, the reset button (or reset procedure) is used to clear fault codes and reinitialize the control board after a temporary fault or power interruption. A reset is often appropriate after:

Power outage or electrical surge that triggers an error code
Gas supply interruptions or flame sensor faults
Display flashing codes indicating a recoverable fault
Maintenance or service work that requires reinitialization

Do not perform a reset if the unit is leaking, producing abnormal flames, or emitting uncontrolled odors. In these cases, shut off gas and electricity and contact a licensed technician.

Locating The Reset Button On Navien Models

Navien tankless models vary by series. Common locations include the front panel or a service panel behind the bottom cover. Some models use a recessed button labeled “RESET” near the control area, while others require a sequence of button presses on the digital display for a reset. Always refer to the specific model’s installation and service manual for the exact location and procedure.

Typical Navien lines include NPE and NFC series, with resets sometimes accessed via the front display or a small recessed reset switch behind a service panel. If the panel is not easily removable, avoid forcing components and consult the manual or a technician.

Step‑By‑Step Reset Procedure

Follow these general steps, noting that exact actions can vary by model. If any step conflicts with your manual, defer to the manufacturer’s instructions.

Turn off the power supply to the unit at the circuit breaker for at least 60 seconds to discharge residual energy.
Shut off the gas supply to ensure safe handling during the reset process.
Open the front panel or service access as needed to reach the control area; identify the reset button or sequence.
Press and hold the RESET button for 3–5 seconds if a single button is present. If the manual specifies a sequence, follow it precisely (for example, “Press and hold for 5 seconds, then release and press again within 2 seconds”).
Release the button and return the door or panel to its closed position.
Restore power at the breaker and turn the gas back on. The unit should begin a normal startup routine.
Observe the display and listen for a normal ignition. If the unit does not restart or continues to show an error code, power down and contact a licensed technician.

Interpreting Error Codes After A Reset

If an error persists after resetting, the display will typically show a fault code. Reference the Navien user manual’s fault code table to interpret codes, which often indicate issues such as ignition faults, flame sensor faults, water pressure problems, or combustion air supply concerns. When codes recur, it’s essential to diagnose underlying causes rather than repeatedly resetting the unit.

Tip: Keeping a note of when and how a fault occurs can help a technician diagnose intermittent issues more quickly.

Common Issues That May Require Professional Service

While a reset can resolve many temporary faults, certain conditions require professional attention to maintain safety and efficiency:

Gas supply irregularities or fluctuating pressure
Persistent ignition failure or flame instability
Water leaks around connections or valves
Unusual noises, frequent cycling, or overheating

Navien units have built‑in safeguards. If the system detects unsafe conditions, it will lock out and display a fault code. In such cases, do not bypass safety features; consult a qualified technician.

Safety And Maintenance Considerations

Routine maintenance reduces the need for resets and extends lifespan. Schedule annual professional service to inspect venting, gas connections, heat exchangers, and electrical components. Regularly inspect external vent termination and ensure there is unrestricted airflow for combustion. Keep the combustion chamber area clean and free of dust or debris.

If you perform any DIY maintenance around electrical or gas components, shut off power and gas first and follow proper lockout/tagout procedures. Use protective gear and avoid contact with hot surfaces during and after operation.

Best Practices To Reduce Reset Frequency

Install a licensed professional inspection schedule aligned with local code requirements.
Ensure proper venting and adequate combustion air, especially in tight living spaces.
Keep water pressure within manufacturer‑recommended ranges; install pressure regulators if needed.
Replace or clean flame sensors and ignition components as advised by Navien service guides.
Maintain clean filters and ensure consistent electricity supply to prevent nuisance faults.

Frequently Asked Questions

Q: Can I reset Navien without reading the manual? A: It is possible to reset by following generic steps, but model variations exist. Always consult the specific manual for exact instructions to avoid damage or safety risks.

Q: How often should Navien tankless water heaters be serviced? A: Annual professional service is recommended, with additional maintenance as needed based on usage and local water quality.

Q: What if the reset doesn’t fix the problem? A: If the fault reappears after a reset, contact a licensed technician to diagnose electrical, gas, or combustion problems and inspect for code-related issues.

Q: Is it safe to reset after a power outage? A: Yes, but ensure the unit is dry and free from any visible damage. Reconnect power and gas only after confirming safe conditions.