Rinnai Sensei N-Series Service Presentation page 81

Fault Codes
SS
Unit does not operate or post an error
NO Code
code when water flow is initiated.
Cascade Diagnostic Display
SE (Commercial units only)
Maintenance Indicator
FF
© 2015 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
Service Soon Alert
Enhancing Lives By Changing The Way Water Is Heated
- 55 is a time-based service indicator set during installation. See section "3.12
Parameter Settings" in owner's manual for additional details on setting and
changing the 55 indicator.
- 55 indicates that it is time for service. The heat exchanger should be flushed to
prevent damage (refer to section "5.3 Flushing the Heat Exchanger" in owner's
manual for more information). Hard water must be treated to prevent scale
build-up or damage to the heat exchanger.
- To reset the 55 code, push the On/Off button on the temperature controller 5 times
in 5 seconds.
- Check/clean inlet water supply filter.
- Ensure the minimum activation water flow rate is met.
- Ensure hot and cold water lines are not reversed / cross connected.
- Ensure there is not a crossover / cross connection somewhere in the building
plumbing or a plumbing fixture.
- Check to ensure the water flow turbine spins freely.
- Measure resistance of the water flow sensor.
- If the display is blank and clicking is coming from the unit, disconnect the water flow
servo motor. If the display comes on, replace the water flow servo.
- With cascade connections on commercial units, the primary unit's display will flash
between "SE" and the selected set temperature when an error code is displayed on
any secondary unit.
- Placeholder in Diagnostic code history indicating that a service provider performed
maintenance or service. Enter this code after performing service by pressing the
UP, DOWN and ON/OFF button simultaneously.
81 11/6/2018