Pump does not respond to Jandy AquaLink automation; display shows COMM ERROR or NO COMM.

Safety first: Turn off power to both the pump and the AquaLink control panel before working on low-voltage wiring.

• Inspect RS-485 wiring:
  • Locate the RS-485 terminals on the Jandy pump drive and on the AquaLink board.
  • Ensure the A/B (or +/–) wires are landed on matching terminals at both ends.
  • Check for loose screws, corrosion, or broken conductors.
• Check cable integrity:
  • Follow the cable run and look for cuts, rodent damage, or splices.
  • Replace the cable if insulation is damaged or conductors are exposed.
• Verify addressing and settings:
  • In the AquaLink menu, confirm the pump is enabled and correctly addressed as a Jandy VS pump.
  • On the pump, ensure it is set to external control mode if required.
• Power cycle system:
  • After correcting wiring, power up the AquaLink first, then the pump.
  • Allow a few minutes for communication to establish.
• If COMM error persists: The AquaLink main board or the pump’s communication interface may be faulty. Contact a Jandy-authorized service technician for board-level diagnostics.