Rain Bird ESP-6TM: Dead Display, Disconnected White Wire

Symptom: Timer Won't Power On

A Rain Bird ESP-6TM with a blank display but known good outlet likely has a power supply issue. A disconnected white wire is suspicious—it's typically the common wire from the valve field.

First Checks

1. Reconnect the white wire to the controller's C (common) terminal.
2. Check the internal fuse (0.5 A, 250 V fast-blow) behind the lower panel.
3. Test transformer output: Should read 24–28 VAC at the controller's AC terminals.

If Display Remains Blank

1. Remove backup battery.
2. Disconnect AC power 60 seconds.
3. Reconnect AC (no battery); check display.

If Still Dead

Controller board is failed. Replace with ESP-TM2 or similar. The disconnected common wire explains why valves wouldn't run, but not the blank display—that's a separate power/board issue.