e012
Moderate
Navien · Tankless Water Heaters
Flame loss during operation.
Quick Answer
Error code E012 on your Navien Tankless Water Heaters means: Flame loss during 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 vent and intake for obstruction.
3
Verify stable gas supply and pressure.
4
Restart unit and monitor recurrence.
5
Call technician for flame signal diagnostics if recurring.
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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