Rinnai code FF: Maintenance has been performed

Not a fault. It’s a marker in the code history showing a technician serviced the heater.

Applies to: SENSEI SENSEI RX/CX Non-SENSEI

What you can safely check

Smell gas? Don’t touch switches or try to reset the heater. Leave the building and call your gas supplier or 911 from outside.

Source: Rinnai, Troubleshooting Tankless Water Heater Diagnostic Codes (document 100000652), page 64. The code name is Rinnai’s; the explanation is ours. Codes differ between series – check the model on your heater’s rating plate. This site is independent and not affiliated with Rinnai.

Other codes

Rinnai tankless error codesLook up any Rinnai tankless water heater error code (10, 11, 12, LC, 79 and more): what it means, what you can safely check, and when to call a technician.Open calculator →Code FEFlammable vapors detectedWhat to check →Code SSTime for serviceWhat to check →

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