e030
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Navien · Tankless Water Heaters
Exhaust overheating condition detected.
Quick Answer
Error code E030 on your Navien Tankless Water Heaters means: Exhaust overheating condition detected.. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Shut down and allow unit to cool.
2
Inspect vent termination for blockage.
3
Clean inlet filter and verify airflow.
4
Flush heat exchanger if scale is present.
5
Have technician inspect exhaust sensor and combustion setup.
Pro Tip
This issue typically requires professional diagnosis. Attempting this fix without proper training could cause further problems.
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