14
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Rinnai · Tankless Water Heaters
Thermal fuse / overheat protection fault.
Quick Answer
Error code 14 on your Rinnai Tankless Water Heaters means: Thermal fuse / overheat protection fault.. This is usually fixable — see the step-by-step guide below.
Affected Models
Likely Causes
How to Fix It
1
Stop operation and allow unit to cool.
2
Inspect venting and airflow clearances.
3
Flush heat exchanger if scale is suspected.
4
Have technician test thermal fuse and safety circuit.
5
Correct gas setup and replace failed components.
Pro Tip
This issue typically requires professional diagnosis. Attempting this fix without proper training could cause further problems.
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