Upon arrival spoke with customer. Customer was experiencing error code e7 @ indoor head for living room space. Customer informed me that her kids are home and may have messed with the settings for the basement system. Customer system is x1 Mitsubishi condenser body x2 indoor head. It was explained that the error code e7 is generally indoor outdoor communication error when x1 indoor is set for a different feature. x1 calling for cooling while the other is set to heat or vice versa. Creating a mode conflict. Explained that a faulty sensor, wiring issues and or a bad control board could have the same effect. Customer system was ran and check to be operational after settings @ control was corrected. Cycle system on/off no issues. Ran and monitor operation for 15-30 minutes no issues. System is up/ running and left operational @ this time.