What to do if LED5 PWR is On but LED1 MODEM PWR and LED2 MODBUS COMM are Off on my Xylem Control Unit?
- RrjohnsonAug 3, 2025
If the LED5 PWR is On, but both LED1 MODEM PWR and LED2 MODBUS COMM are Off, try the following steps: 1. Disconnect the wiring harness from the FST module. 2. Wait 10 seconds. 3. Reconnect the wiring harness to the FST module. 4. Wait 60 seconds to allow communication to establish. If the issue continues after these steps, then return the unit.