Navien Water Heater E110: Official Meaning and Checks
Direct answer
What E110 means
Official Navien material describes E110 as Abnormal air pressure. This guide records the cited product-family scope, safety-reviewed owner checks, and service limits.
Before you begin
Safety first
If the remedy does not resolve the problem, contact an authorized technician, licensed professional, or Navien Technical Support.
- Record the complete displayed code and the full model number before clearing the display.
- Disconnect power before touching a user-accessible filter, hose, burner, or electrical connection.
- Stop using the equipment if it leaks, smells burned or of gas, smokes, sparks, or trips a breaker.
Does this guide apply?
- Region
- United States
- Product family
- Navien NPE-180A/210A/240A and NPE-150S/180S/210S/240S (manual cover list)
- Exact models
- Not listed in the cited source. Confirm the full model in the official manual.
- Scope note
- The cited source scope is Navien NPE-180A/210A/240A and NPE-150S/180S/210S/240S (manual cover list). Confirm the complete model number before applying the guidance; an empty model list does not imply all models.
Find the model label and official manual before ordering a part
Common paths to check
These are source-backed possibilities, not probability estimates for your specific unit.
- 01 Official source meaning: Abnormal air pressure.
Decision path
Safe checks, in order
- 1
Confirm code and model scope
Compare the complete display and full model number with the cited manufacturer page or manual before applying any troubleshooting instruction.
Expected: The official source explicitly covers the displayed code and product family.
If not resolved: Contact manufacturer support with the full model and serial number.
- 2
Follow the official owner checks
Ensure that the exhaust pipe is free of obstructions. Clean the intake air filter.
Expected: Only the user-accessible condition identified by the official source is corrected.
If not resolved: Stop repeated resets and arrange qualified service if the code returns or the source directs service.
Reset and test
- Reset button on the front panel for minor problems (manual Section 5.1); specific codes may require 30-minute power-off and restart as listed in the table.
Important: A reset may clear the display but cannot repair the underlying condition; follow only the exact model-specific manufacturer procedure.
Escalation point
Stop and arrange service when
- If the remedy does not resolve the problem, contact an authorized technician, licensed professional, or Navien Technical Support.
- The equipment leaks, smells burned or of gas, smokes, sparks, overheats, or trips a breaker.
Model-first repair planning
Components that may be involved
The items below describe the documented diagnostic path. They are not a diagnosis and do not identify a compatible replacement part without the complete model and original part number.
- Exhaust pipe
- intake air filter
Official sources
We paraphrase manufacturer material and show the publication scope so you can verify it.
- Navien NPE Operation Manual (English), Section 5.2 Understanding Error Codes, PDF page 16 Navien · E110 · accessed 2026-08-08
Reviewed by Device Fix Guide · Last source check:
Related guides for this equipment
These links share the same brand and equipment family. A related guide does not prove that the codes have the same cause on your model.
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