What you'll notice with E110
- Lockouts on windy days or after landscaping work
- Unit runs briefly then faults
- Common on units with long or improperly sloped vent runs
Navien E110 Error Code: Air Pressure / Exhaust Blockage
Air pressure / exhaust blockage — combustion air or exhaust flow is obstructed.
Safe to try one reset
Open 24/7 · CSLB #1008381 · Joseph J. Castro, Owner
Quick answer
Navien E110 means: Air pressure / exhaust blockage — combustion air or exhaust flow is obstructed. It's usually caused by blocked intake or exhaust termination, excessive vent length, or clogged air filter. The fix: Inspect and clear terminations, verify vent length and slope, clean or replace the air intake filter. Efficient Water Heaters, Inc. diagnoses Navien E110 faults across San Jose 24 hours a day, 7 days a week — (408) 470-0191, CSLB #1008381.
What causes it
Blocked intake or exhaust termination, excessive vent length, or clogged air filter.
Safe steps you can take right now
- 1Walk outside and inspect both the intake and exhaust terminations for nests, leaves, or snow-guard style obstructions.
- 2Check the air intake filter for lint and dust.
- 3Reset once after clearing an obvious blockage.
How we fix E110
If the terminations are clear, we measure vent length against the allowed equivalent run, check slope and joints for sagging condensate traps, and verify the pressure switch and its tubing.
Inspect and clear terminations, verify vent length and slope, clean or replace the air intake filter.
Get your Navien E110 fixed
Call (408) 470-0191 any hour, or send the form and we'll reach out.
Navien E110 — related services, cities, and codes
E110 rarely shows up alone. These are the services that resolve it, the cities we cover, and the codes that often appear alongside it.