Control Unit Error - Rinnai Q series Troubleshooting Manual

Check ribbon cable between the control
unit and the display board. A loose
connection between these two points can
cause communication issues between
boards leading to an error code. If ribbon
cable is loose or damaged, repair or
replace cable as needed.
If error persist
after reset
Software error control unit, replace control unit. Remove
the E-Prom from the defective control unit and place it
onto the new control. The controller will automatically
load the program into the new control unit.
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