e109
Moderate
Navien · Tankless Water Heaters
Fan motor abnormal operation.
Quick Answer
Error code E109 on your Navien Tankless Water Heaters means: Fan motor abnormal operation.. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Clean intake air filter.
2
Check for vent blockage and debris.
3
Restart unit and listen for fan startup.
4
If fan does not run properly, schedule service.
5
Technician should verify fan motor electrical values.
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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