Diagnos C Codes - Rinnai REU‐VC2528FFUD‐US Installation And Operation Manual

Temperature Op ons Without a Temperature Controller
The default temperature se ng for this appliance installed without a temperature controller is 120° F (49° C). If
desired, the temperature se ng can be changed to 140° F (60° C) by adjustment of a switch.
In the SW1 Dip switch (tan switches), set switch 5 to ON to obtain 140° F water temperature se ng. Set switch
5 to OFF (default) to obtain 120° F water temperature se ng. If a temperature controller is installed, then
switch 5 has no effect on temperature se ngs.
Se ng Controller to Mute
On the MC‐91‐2 to eliminate the beeps when keys are pressed or to turn the beeps back on, press and hold both
the up and down bu ons un l a beep is heard (approximately 5 seconds).
Locking the Controller
The MC‐91‐2 controller can be locked by pressing the Priority bu on and the up bu on together for 5 seconds.
A beep will sound confirming that the controller is locked. The display will alternately show "LOC", the
temperature se ng, and a diagnos c code if one has been ac vated. All of the controllers in the system are
also locked.
To unlock the controller press the Priority bu on and the up bu on together for 5 seconds.
Diagnos c Codes
This water heater is designed to display diagnos c codes. If there is a poten al opera on concern refer to the
code and remedy on the next page.
To Display Diagnos c Informa on
To display the most recent diagnos c informa on codes press and hold the "On/Off" bu on for 2 seconds on
the MC‐91‐2 controller. While holding the "On/Off" bu on press the up bu on. The last 9 diagnos c codes will
flash one a er the other. To exit this mode press the "On/Off" and up bu on as before.
To enter or exit the maintenance monitor informa on mode press and hold the down bu on for 2 seconds and
without releasing it press the ON/OFF bu on.
To obtain the water flow rate press the up or down bu ons un l "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 bu ons un l "02" displays. The temperature
will appear in degrees Fahrenheit.
No.
36
Data
01 Water flow rate
02 Outgoing water temperature
Unit
0.1 gal/min
Degrees Fahrenheit
VC Series Manual