Navien Error Code E110
Air Supply or Exhaust Blockage
Call 778-909-5731 NowError code E110 indicates that your Navien boiler has detected a problem with air supply or exhaust venting. The air pressure switch has signaled that proper airflow for combustion is not being maintained. This is a critical safety feature that prevents dangerous exhaust gases from entering your home.
No. Your boiler has shut down to protect you from carbon monoxide and other combustion byproducts. Do not attempt to restart the unit until the venting system has been inspected and cleared by a professional.
- Blocked exhaust vent: Snow, ice, bird nests, or debris blocking the outdoor vent
- Blocked air intake: Obstruction preventing fresh air from entering
- Air pressure switch failure: Faulty switch or stuck diaphragm
- Vent piping issues: Improper installation, damage, or condensate backup
- Combustion fan problem: Fan motor failure or obstruction
- Check outdoor vent terminations for visible obstructions (snow, ice, debris)
- Clear away any snow or ice buildup around vent pipes
- Verify the boiler has power
STOP HERE
Do not disassemble venting components, access internal switches, or attempt to test electrical connections. Professional diagnosis is required to ensure safe operation.
Navien E110 requires professional venting system inspection and repair. Our licensed technicians can:
- Inspect entire vent system for blockages or damage
- Test air pressure switch and combustion fan
- Clear internal condensate traps and drain lines
- Verify proper vent pipe installation and pitch
- Test combustion and verify safe operation