Thank You Matt,
Maybe what I'm seeing is actually a communication error to the ZEN17, which is outside of the house - opposite side of the Z-Stick, too. The sprinkler system that it's supposed to trigger actually did turn on when I tried it again, after a long delay.
Here's the error in the log when sending an On command via Indigo:
Z-Wave Error no ack/nak/busy reply (075) for setRelayValue (re-sending)
Z-Wave Error received busy failure reply (02) for setRelayValue (re-sending)
Z-Wave Error received busy failure reply (02) for setRelayValue (re-sending)
Z-Wave Error send "Mosquito Sprinkler" off failed
Here's the log when syncing: *(It shows the log from hitting sync several times):
Z-Wave Error Syncing - failed to assign return route
Z-Wave Error Syncing - failed
Z-Wave Error No response from "075 - Mosquito Sprinkler ALL relays". Module might be asleep, or is unreachable.
.
Z-Wave Syncing - started for "Mosquito Sprinkler ALL relays"
Z-Wave Syncing - retrieved module neighbors list: 6, 24, 40, 67, 74
Z-Wave Syncing - assigning return route to "075 - Mosquito Sprinkler ALL relays"
Z-Wave Error Syncing - failed to assign return route
Z-Wave Error Syncing - failed
Z-Wave Error No response from "075 - Mosquito Sprinkler ALL relays". Module might be asleep, or is unreachable.
Z-Wave received "Mosquito Sprinkler ALL relays" status update is off
Z-Wave received "Mosquito Sprinkler ALL relays" status update is on
Z-Wave received "Mosquito Sprinkler ALL relays" status update is off
Z-Wave received "Mosquito Sprinkler ALL relays" status update is on
Z-Wave received "Mosquito Sprinkler ALL relays" status update is off
Z-Wave Syncing - started for "Mosquito Sprinkler ALL relays"
Z-Wave Syncing - retrieved module neighbors list: 6, 24, 40, 67, 74
Z-Wave Syncing - assigning return route to "075 - Mosquito Sprinkler ALL relays"
Z-Wave received "Mosquito Sprinkler ALL relays" status update is on
Z-Wave Error Syncing - failed to assign return route
Z-Wave Error Syncing - failed
Z-Wave Error Timeout waiting for "075 - Mosquito Sprinkler ALL relays". Module might be asleep, or is unreachable.
Z-Wave Syncing - started for "Mosquito Sprinkler ALL relays"
Z-Wave Syncing - retrieved module neighbors list: 6, 24, 40, 67, 74
Z-Wave Syncing - assigning return route to "075 - Mosquito Sprinkler ALL relays"
Z-Wave Error Syncing - failed to assign return route
Z-Wave Error Syncing - failed