Troubleshoot MUX A Wire Fail or Wiring Fault

What causes the panel to display "MUX A Wire Fail or Fault"?

• Causes:

Wiring Fault  - Is an Open Loop for a Class A Wired Loop.

Wire Fail - Is a Short across the loop wiring

• Solution

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.

• Enter Program Mode
• Press 0 - Enter Pin (Default is 9876)
• Press 9 PROGRAM MUX
• Press 3 BUS TYPE - Choose (1) for Class A  - (2) Class B

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