Rinnai HE Series How To Use Manual page 182

1. Check wiring harness to the water flow servo for loose, broken or damaged connections from
servo back to PC board.
2. Turn off the power to the water heater and then reapply to see if code resets.
3. The water flow servo valve has failed to close during the bath fill function. Immediately turn off
the water flow and discontinue the bath fill function.
4. Replace water flow control servo.
Code 65 Troubleshooting Procedure
Water Flow Servo
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