Nibe VVM 500 - Page 29

Alarm 71 - perm. com.error input card
Is the wiring connector (W109)
correctly connected on base card
(AA2-X5) and on the input card
(AA3-X1)?
YES
NO
Has the fault been corrected?
Replace the base card (AA2).
OK.
YES
Action.
NO
Replace the input circuit board
(AA3).
Is the wiring connector (W105)
correctly connected on input circuit
board (AA3-X2) and on the display
card (AA4-X8)?
Action.
NO
YES
NO
Has the fault been corrected?
OK.
YES
Replace the display card (AA4).
27Chapter 6 | TroubleshootingNIBE™ VVM 500