What causes the panel to display "MUX A Wire Fail or Fault"?
Wiring Fault - Is an Open Loop for a Class A Wired Loop.
Wire Fail - Is a Short across the loop wiring
MUX WIRE FAIL or FAULT Check the following
1) Programming - is the buss wired Class A or Class B, Check that MUX BUS TYPE is set to the correct option.
2) Measure for a short across the MUX Buss. You should have 8 to 10 VDC on the both Buss A and B.
Part numbers FPD-7024, D7024, DS9400, DS9400I, DS9400M,DS9431, D7039, FPE-7039