e110
Moderate
Navien · Tankless Water Heaters
Abnormal air pressure condition detected.
Quick Answer
Error code E110 on your Navien Tankless Water Heaters means: Abnormal air pressure condition detected.. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Inspect and clear intake/exhaust obstructions.
2
Clean intake air filter.
3
Restart the water heater.
4
Check for recurrence during sustained hot water use.
5
Call service if pressure fault remains active.
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
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