Rinnai · Water heater
Code 01 Ignition or flame detection problem
What this code means
General fault covering the ignition and flame-sensing circuit failing to establish a stable flame.
Most likely causes
- Gas supply or pressure issue
- Failing ignition or flame sensor components
What to try first
Confirm the gas valve is fully open before assuming a sensor failure.
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.
FAQ
What does Rinnai error code Code 01 mean?
Ignition or flame detection problem. General fault covering the ignition and flame-sensing circuit failing to establish a stable flame.
Can I fix Rinnai code Code 01 myself?
Usually not. Confirm the gas valve is fully open before assuming a sensor failure. If the code returns after one reset, it needs a licensed technician.
What causes Rinnai code Code 01?
The most common causes are: gas supply or pressure issue; failing ignition or flame sensor components.
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.