Understanding “Flow Condition” Errors on Spa & Hot Tub Systems (Gecko & Balboa): Causes, Fixes & Prevention A “Flow Condition” or “FLO” error is one of the most common issues spa and hot tub owners face. Whether you use a Gecko touchpad... Balboa keypad E03 FLO error flow condition error Gecko keypad hot tub error codes hot tub safety No Flow No Flow Conditions spa heater not working spa maintenance spa repair spa troubleshooting