Rinnai HE Series How To Use Manual page 190

Code FF Troubleshooting Procedure
Indicates a serviceman has serviced product
This code indicates a service provider performed maintenance or repair. The serviceman will enter the
following code FF after making repairs to the product. That flags the system indicating all codes after the
FF took place after he made his repairs. You can enter the FF code by; pressing the up, down and
ON/OFF buttons simultaneously.
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