Rain Dial RD-600 EXT Persistent FUS: Controller Panel Failure

RD-600 EXT flashing FUS on all zones after fuse/battery replacement and reset = controller panel (facepack) failed.

Confirm

1. Disconnect common field wire at controller C terminal.
2. Reset (power off 30 sec, on).
3. Run zone manually. FUS still flashes? → Panel dead.

Fix: Panel Swap

1. Unplug ribbon cable at back of panel.
2. Pull panel straight out from hinge pins.
3. Buy replacement panel (~$85–$100) at irrigation supplier.
4. Install, reconnect ribbon, test.

Why Not Repair

RD-600 panels have recurring output driver failures. Repair cost ≈ replacement. New panel = new warranty.

Don't replace the whole cabinet—just the facepack. 5-minute job.