Rinnai · Water heater
Code 16 Outlet water temperature sensor fault
What this code means
The sensor measuring the temperature of water leaving the unit isn't reading correctly.
Most likely causes
- Failed or scaled-over thermistor
- Loose wiring connection
What to try first
Requires opening the unit to test and likely replace the sensor.
Safety note: if this code returns after one clean reset, stop resetting it — repeated lockouts usually mean a real fault that needs a licensed technician. Never bypass a safety switch.
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What does Rinnai error code Code 16 mean?
Outlet water temperature sensor fault. The sensor measuring the temperature of water leaving the unit isn't reading correctly.
Can I fix Rinnai code Code 16 myself?
Usually not. Requires opening the unit to test and likely replace the sensor. If the code returns after one reset, it needs a licensed technician.
What causes Rinnai code Code 16?
The most common causes are: failed or scaled-over thermistor; loose wiring connection.
Other Rinnai water heater codes
All Rinnai water heater error codes →
Other water heater brands: Rheem · Ruud · Navien · Noritz · Takagi · A.O. Smith · Bradford White · State / American · Generic electric · Generic tankless
This information may contain errors or not apply to your exact model — always double-check it against your appliance's own manual before acting. If there's any chance of a gas, fire, electrical, carbon monoxide, or other safety hazard, stop and call a licensed professional or the appropriate agency (e.g. your gas utility) instead of relying on this page alone.