Error Code 110 on a Navien boiler or water heater typically indicates a "Flue Pressure Sensor Fault" or "Abnormal Flue Pressure Detected". This means the appliance has detected abnormal pressure within the ventilation system, which may be related to the exhaust or air intake pathways.
Potential causes for Error Code 110 include:
- Blocked Exhaust or Air Intake Pipe – Obstructions or buildup may be blocking the airflow path.
- Fan Malfunction – The fan may not be operating correctly, preventing the unit from expelling exhaust gases or drawing in fresh air.
- Flue Pressure Sensor Fault – The sensor itself may be damaged or detecting pressure inaccurately.
- Incorrect Installation of Intake or Exhaust Piping – If the pipe length, diameter, or layout does not meet the manufacturer's specifications, it can lead to abnormal pressure.
Solutions:
- Inspect the appliance's air intake and exhaust pipes for any blockages and ensure proper ventilation.
- Check if the fan is operating normally. If necessary, contact a professional technician for repair or replacement.
- If the issue persists, it is recommended to contact a professional technician for repair service to perform further troubleshooting and repairs.