No compressor control

[Peter H]

We connected the compressor vis in LabView, connecting the Open vi to module 4, DIO 2, and relay 1. The Pressure limit switch plugs into DIO2. A spike relay plugs into relay 1. On power on, the spike lights red, and the compressor does not turn on. The spike is OK - I connected a battery to the control inputs, and the relay lights green, and the compressor starts. The Open vi connects to a Run vi, which connects to the Close vi. The Run vi is in a while loop that runs every 100 msec.

I expect the spike to close, show a green LED, and start the compressor when I run the program. What am I doing wrong?