Rinnai RUC80i Training Program page 69

Temperature Controller
The MC-91-2 temperature controllers provide the following
diagnostic capabilities:
• To display the error code history: Press and hold the
ON/OFF button. After 2 seconds, simultaneously press
the UP arrow then let go of both buttons. The error code
history will be displayed with the most recent recorded
error code being displayed first. To exit the error code
history, repeat the procedure.
• To enter the maintenance information mode: Press and
hold the Down arrow. After 2 seconds, simultaneously
press the ON/OFF button then let go of both buttons. An
"01" will be displayed briefly followed by the water flow
rate (in GPM). To select the next information mode, press
the up arrow. An "02" will be displayed followed by the
water heater output temperature (in Fahrenheit).
Continue to press the up or down arrow to scroll through
the remaining information modes *. To exit the
information mode, repeat the procedure.
* The remaining info modes are explained on the next page
© 2016 Rinnai America Corporation
PROPRIETARY and CONFIDENTIAL
(Adjustments and Diagnostics)
Enhancing Lives By Changing The Way Water Is Heated
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69 5/4/2018