E353 🟡 Repair Required
Navien Error Code E353: APS Sensor Open/Short
⚠️ 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.
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 of Navien Code E353
- 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
Applicable Navien Models
Source Documentation
This error code is documented in 5 official Navien technical manuals.
NFB-H Installation & Operation ManualPage 116
ReasonWater Pressure Sensor
ActionCheck WPS.
Navien NCB-H Installation & Operation ManualPage 129
ReasonWater Pressure Sensor
ActionContact technical support at 1-800-519-8794.
Navien NFB-H Installation & Operation ManualPage 116
ReasonWater Pressure Sensor
ActionCheck WPS.
Navien NFC-H Installation & Operation ManualPage 127
ReasonAbnormal operation: water pressure sensor
ActionAuto RESET
Navien NHB-H Installation & Operation ManualPage 119
ReasonWater Pressure Sensor
ActionCheck WPS.
Need a Pro to Fix Navien Code E353?
A licensed HVAC technician can diagnose and fix this issue quickly.
Find a Licensed Tech Near You →Replacement Parts for Navien Tankless Water Heater Code E353
Air Pressure Switch (APS) Sensor OEM: 200-10002-00