Navien Error Code E810: Abnormal circulator operation (inoperable)
Warning: The Navien tankless water heater has shut down due to a circulation issue. You will not have hot water. Professional service is likely required.
How to Fix Navien Code E810
- Step 1: Turn the unit off and then back on again. This may reset the system and clear a temporary error.
- Step 2: Check the system pressure on the unit's display. Low water pressure can sometimes cause circulation issues. Ensure it's within the normal operating range (typically 15-20 PSI).
- Step 3: If the error persists after resetting and checking pressure, contact a qualified HVAC technician for diagnosis and repair.
How to Reset Navien Code E810
- 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.
What does E810 mean?
The E810 error code on your Navien tankless water heater indicates an issue with the circulator pump. This pump is responsible for moving water through the heat exchanger, allowing it to be heated efficiently. When the control board detects that the pump isn't operating correctly, it shuts down the unit to prevent overheating or damage. This can happen due to a pump failure, blockage in the system, or an electrical problem.
Without proper circulation, the water heater can't heat water effectively, and the high limit switch may trip. This error often requires a technician to diagnose the root cause and replace the faulty component. Ignoring this error can lead to further damage to the unit and a prolonged period without hot water.
Affected Models
- NCB-H
- NFB-H
- NFC-H
- NHB-H
- NHW-A
- NPE-A2
- NCB
- NCB
- NCB
- NPE
- NPE
- NPE
- NHB
- NHB
- NCB
- NCB
- NPE
- NPE
- NCB
- NCB
- NPE
- NCB
- NPE
- NHB
- NCB
- NPE
- NPE
- NCB
- NCB
- NPE
- NPE
- NPE
- NPE
- NHB
- NHB
- NCB
- NCB
- NPE
- NPE
- NBP
- NPE
- NPE
- NPE
- NFC
- NFC
- NCB
- NPE
- NPE
- NPE
- NCB
- NPE
- NCB
- NPE
- NPE
- NCB
- NPE
- NHB
- NPE-S
- NPN
- NPN
- NCB
- NPE
- NCB
- NPE
- NHB
- NPB
- NFC
- NFC
- NHB
- NPF
- NPF
- NPE
- NHB
Source Documentation
| Manual | Page | Reason | Action |
|---|---|---|---|
| Navien NPF Installation & Operation Manual | 129 | Abnormal circulator operation (inoperable) | This error occurs when the ECM Motor is inoperable. ● Check the filter’s status. ● Check the SA or RA ducts. ● Check if foreign substances are inside the furnace. ● Turn off the furnace, turn it on again, and check if the furnace operates properly. ● If this error occurs continuously, contact Technical Support at 1-800-519-8794. |
Replacement Parts
| Part | OEM Number | Est. Cost |
|---|---|---|
| Circulator Pump | — | — |
| Main Control Board | — | — |
| Flow Sensor | — | — |
Related Codes on Same Models
| 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 |