e016
Moderate
Navien · Tankless Water Heaters
Heat exchanger overheating protection triggered.
Quick Answer
Error code E016 on your Navien Tankless Water Heaters means: Heat exchanger overheating protection triggered.. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Turn unit off for at least 30 minutes, then restart.
2
Clean inlet water filter.
3
Flush heat exchanger to remove scale.
4
Verify adequate water flow through unit.
5
Schedule service if overheating repeats.
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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