Not able to manually run zones

I recently replaced my existing controller with a Rachio3 and the system worked fine. Zones ran on schedule, and also ran on manual. Today I am attempting to manually run a single zone to fix a head, but none of the zones can be manually turned on. I have an existing external rain sensor connect to my Rachio, and the last rain was 2 days ago. Is there anyway to override and force a zone to turn on?