16
Moderate
Rinnai · Tankless Water Heaters
Outgoing water temperature exceeded safety threshold.
Quick Answer
Error code 16 on your Rinnai Tankless Water Heaters means: Outgoing water temperature exceeded safety threshold.. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Turn off unit and let it cool.
2
Flush heat exchanger to remove scale.
3
Check inlet filter and water flow.
4
Restart and monitor outlet temperature.
5
Call service if high temperature warning recurs.
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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