Navien Error Code E480: BMS Communication Error
Warning: Your Navien boiler is experiencing a BMS communication error, which may affect its performance and require professional repair.
How to Fix Navien Code E480
- Check for any visible damage to the wiring harness connecting to the BMS
- Ensure all sensors are securely connected and free from debris
- Contact a professional HVAC technician for further diagnosis and repair
How to Reset Navien Code E480
- 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 E480 Mean?
If you're seeing the E480 error code on your Navien boiler's digital display, it means there's a communication issue between the boiler's main control board (BMS) and other components. This could be due to a faulty sensor, wiring issue, or software glitch. While it's not an immediate safety hazard, it's important to address this issue to prevent further system damage or reduced efficiency.
Common Causes
- Faulty temperature or pressure sensor
- Wiring issue between BMS and other components
- Outdated or corrupted BMS software
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| Boiler is not heating | Temperature sensor readings | Normal temperature readings |
| Pressure readings are abnormal | Pressure sensor | Normal pressure readings |
Applicable Navien Models
Source Documentation
Referenced in 3 official Navien technical manuals.
| Manual | Page | Reason | Action |
|---|---|---|---|
| NFB-H Installation & Operation Manual | 116 | DHW Tank Sensor Not Detected | Check sensor connections. |
| Navien NFB-H Installation & Operation Manual | 116 | DHW Tank Sensor Not Detected | Check sensor connections. |
| Navien NHB-H Installation & Operation Manual | 119 | DHW Tank Sensor Not Detected | Check sensor connections. |
Replacement Parts
| Part | OEM Number | Est. Cost | Where to Buy |
|---|---|---|---|
| Temperature Sensor | — | — | — |
| Pressure Sensor | — | — | — |
Related Codes on Same Models
Other codes that affect the same Navien model families as E480.
| 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 |