Navien Error Code E353: APS Sensor Open/Short
Warning: Your Navien boiler has detected an issue with the APS (Air Pressure Switch) sensor, which could lead to system damage if not addressed.
How to Fix Navien Code E353
- Check if the boiler's reset button has popped out. If so, press it gently to reset the boiler.
- Listen for any unusual noises coming from the boiler. If you hear any, turn off the power to the boiler at the circuit breaker and contact a professional HVAC technician.
- When to call a pro: Always if you're not comfortable performing any checks or if the reset button doesn't work.
How to Reset Navien Code E353
- 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 E353 Mean?
The E353 error on your Navien boiler indicates that the Air Pressure Switch (APS) sensor is either open or shorted. This sensor is responsible for monitoring the air pressure within the boiler to ensure safe operation. If the sensor is open, it's not sending any signal to the control board, and if it's shorted, it's sending a constant signal. Either condition can cause the boiler to malfunction or shut down.
Common Causes
- A faulty Air Pressure Switch (APS) sensor
- Damaged wiring or connections to the APS sensor
- Air pressure in the boiler that's out of the normal range
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| Boiler is not operating | Reset button status | Button should be in, if not, try resetting it |
| Boiler is operating | Air pressure in the boiler | Between 0.5 to 1.5 inches W.C (water column) |
Applicable Navien Models
Source Documentation
Referenced in 5 official Navien technical manuals.
| Manual | Page | Reason | Action |
|---|---|---|---|
| NFB-H Installation & Operation Manual | 116 | Water Pressure Sensor | Check WPS. |
| Navien NCB-H Installation & Operation Manual | 129 | Water Pressure Sensor | Contact technical support at 1-800-519-8794. |
| Navien NFB-H Installation & Operation Manual | 116 | Water Pressure Sensor | Check WPS. |
| Navien NFC-H Installation & Operation Manual | 127 | Abnormal operation: water pressure sensor | Auto RESET |
| Navien NHB-H Installation & Operation Manual | 119 | Water Pressure Sensor | Check WPS. |
Replacement Parts
| Part | OEM Number | Est. Cost | Where to Buy |
|---|---|---|---|
| Air Pressure Switch (APS) Sensor | 200-10002-00 | — | Find Part |
Related Codes on Same Models
Other codes that affect the same Navien model families as E353.
| 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 |