1. Are the signal lights lighting up on the Flow Gateway?

Engage each grouphead on the coffee machine (just a purge is fine), checking the corresponding light shows up on the home screen of the Flow Gateway.

If the Flow Gateway is non-responsive, first restart it.

If the Flow Gateway is responsive but the lights don’t illuminate correctly, then you may have a wiring issue.

Check:

1. The flow meter pins are clean and undamaged (if flow meters have been subject to water damage the flow meter pins may need to be thoroughly cleaned or the flow meters replaced to ensure a reliable connection)
2. All contacts on the Flow cable and coffee machine wiring loom are clean and tight fitting (contacts on the Flow wafer cable can be adjusted by bending gently with a flat head screwdriver)
3. The correct Flow cable and pin-out adapter is being used.  
   For more information see:
   https://flowcoffee.freshdesk.com/support/solutions/articles/51000419315-flow-meter-cable-variations

2. What if the wrong signal lights are showing when I run a purge on the coffee machine?

Ensure that you have installed the appropriate connectors to the respective flow meters in the coffee machine. The connectors are labeled on Flow cable 1 and 2. These correspond to groupheads 1 and 2 (counting from left to right) on the first Flow cable (GH1/2) and groupheads 3 and 4 on the second Flow cable (GH3/4).