Diagnostic Codes - Rinnai V75i series Installation And Operation Manual

Diagnostic Codes

This water heater is designed to display diagnostic codes. If there is a potential operation concern refer to the
code and remedy on the next page.
To Display Diagnostic Information
To display the most recent diagnostic codes press and hold the "On/Off" button for 2 seconds on the MC-91-2
controller. While holding the "On/Off" button press the up button. The last 9 diagnostic codes will flash one
after the other. To exit this mode press the "On/Off" and up button as before.
To enter or exit the maintenance monitor information mode press and hold the down button for 2 seconds and
without releasing it press the ON/OFF button.
To obtain the water flow rate press the up or down buttons until "01" displays. The water flow rate will then
appear. For example "58" means 5.8 gal/min.
To obtain the outgoing water temperature press the up or down buttons until "02" displays. The temperature
will appear in degrees Fahrenheit.
No. Data
01 Water flow rate
02 Outgoing water temperature
Value Series Manual
Unit
0.1 gal/min
Degrees Fahrenheit
33