Navien Error Code E302: Remote Controller Communication
Warning: Your Navien boiler's remote controller is having trouble communicating with the main unit. This could lead to system malfunctions if not addressed.
How to Fix Navien Code E302
- Check if the remote controller is within range of the main unit and there are no obstructions between them
- Move other electronic devices or appliances away from the remote controller and main unit to reduce interference
- Replace the batteries in the remote controller and try resetting it
How to Reset Navien Code E302
- 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 E302 Mean?
The E302 error on your Navien boiler indicates a communication issue between the remote controller and the main unit. This could be due to a variety of reasons, such as a weak signal, interference, or a faulty controller. While this error doesn't pose an immediate safety risk, it's important to address it to prevent potential system malfunctions or reduced efficiency.
Common Causes
- Weak or interrupted signal between the remote controller and the main unit
- Interference from other electronic devices or appliances
- Faulty remote controller or main unit
- Incorrect controller programming or settings
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| The remote controller's display shows the E302 error consistently | Measure the signal strength between the remote controller and the main unit using a multimeter | A strong, consistent signal |
| The signal strength is weak or inconsistent | Check for any physical obstructions or sources of interference between the remote controller and the main unit | No obstructions or interference sources |
Applicable Navien Models
Source Documentation
Referenced in 4 official Navien technical manuals.
| Manual | Page | Reason | Action |
|---|---|---|---|
| NFB-H Installation & Operation Manual | 116 | Low Water Pressure | Check water pressure. |
| Navien NFB-H Installation & Operation Manual | 116 | Low Water Pressure | Check water pressure. |
| Navien NHB-H Installation & Operation Manual | 119 | Low Water Pressure | Check water pressure. |
| Navien NPF Installation & Operation Manual | 126 | Low water level | This error occurs when the water tank in the furnace is not filled with enough water. (When the water filling option is set to manual.) ● Open the water inlet cover on the lower-front cover of the furnace, and then fill the water tank with water. |
Replacement Parts
| Part | OEM Number | Est. Cost | Where to Buy |
|---|---|---|---|
| Navien Remote Controller | — | — | — |
Related Codes on Same Models
Other codes that affect the same Navien model families as E302.
| 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 |