Navien Error Code E441: Dom.Hot Water Outlet2 Sensor
How to Fix Navien Code E441
- Step 1: Power cycle the unit by turning off the power switch for 30 seconds, then turn it back on. This may reset the system and clear a temporary error.
- Step 2: Check the sensor wires that are visible without opening the unit. Look for any obvious damage or loose connections.
- Step 3: If the error persists after power cycling, contact a qualified HVAC technician to diagnose and repair the issue.
How to Reset Navien Code E441
- Turn off the unit using the power button on the front panel.
- Turn off the gas supply valve.
- Turn off the circuit breaker supplying power to the unit. Wait 30 seconds.
- Restore power at the breaker, then open the gas valve.
- Turn the unit back on. If the error returns, the underlying issue needs repair.
Resetting clears the code from the display but does not fix the underlying fault. If the code returns after reset, proceed to the diagnostic steps above.
What Does Navien Error Code E441 Mean?
The E441 error code on your Navien tankless water heater indicates a problem with the DHW Outlet 2 sensor. This sensor monitors the temperature of the hot water as it leaves the unit. The Navien control board uses this temperature reading to regulate the burner and maintain a consistent hot water temperature. If the control board receives an unusual or no signal from this sensor, it will display the E441 error and shut down the unit to prevent potential overheating or other issues. This shutdown is a safety feature to protect the unit and your plumbing system. Specifically, this error means the control board is seeing either an open circuit, short circuit, or a reading outside the acceptable range from the DHW Outlet 2 sensor. This could be due to a faulty sensor, wiring issues, or even a problem with the control board itself. Because the unit relies on accurate temperature readings to operate safely and efficiently, it's important to address this issue promptly.
Common Causes
- Faulty DHW Outlet 2 sensor
- Wiring issue (loose connection, damaged wire) between the sensor and the control board
- Corrosion on the sensor or connector pins
- Sediment buildup on the sensor affecting its accuracy
- Control board malfunction
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| Unit displays E441 error | Measure the resistance of the DHW Outlet 2 sensor at the control board connector | Resistance should be within the range specified in the Navien service manual for the measured water temperature. (Typically around 10k ohms at room temperature) |
| Sensor resistance is out of range or open circuit | Inspect the wiring harness and connector pins for corrosion or damage | Wiring and connectors should be clean and in good condition |
| Wiring appears OK | Check the voltage at the sensor connector on the control board (with the sensor disconnected) | Should be a stable DC voltage (typically 5VDC) |
| Voltage is present and stable, but sensor resistance is incorrect | Replace the DHW Outlet 2 sensor | Error code clears and unit operates normally |
Applicable Navien Models
Source Documentation
Referenced in 2 official Navien technical manuals.
| Manual | Page | Reason | Action |
|---|---|---|---|
| Navien NCB-H Installation & Operation Manual | 129 | Dom.Hot Water Outlet2 Sensor | Contact technical support at 1-800-519-8794. |
| Navien NFC-H Installation & Operation Manual | 127 | Hot water outlet 2: thermistor open or short circuit | Auto RESET |
Replacement Parts
| Part | OEM Number | Est. Cost | Where to Buy |
|---|---|---|---|
| DHW Outlet 2 Temperature Sensor | 30012345A | — | Find Part |
| Main Control Board | PCB-NR240A | — | Find Part |
Related Codes on Same Models
Other codes that affect the same Navien model families as E441.
| Code | Description | Severity |
|---|---|---|
| E001 | Ignition Failure | Warning |
| E003 | Abnormal Ignition | Warning |
| E004 | False Flame Detection | Warning |
| E012 | Flame Loss | Warning |
| E016 | Overheating | Warning |
| E030 | Exhaust Overheat Sensor | Warning |
| E031 | Inlet Thermistor Open/Short | Warning |
| E046 | Outlet Thermistor Open/Short | Warning |
| E047 | DHW Thermistor Open/Short | Warning |
| E060 | Fan Motor Abnormality | Warning |