AERONET Instrument Troubleshooting Interface - Solutions for GPS NOT SYNCRONIZED Flag

Description
The Model T control box uses a GPS receiver to synchronize its internal clock to UTC once per day. Without regular synchronization the clock will gradually drift, eventually causing the instrument to point at incorrect solar positions. (Model T only.)

Condition(s)
Flag if last day in 3

How To Check/Test
Only Model T instruments. See GPS Antenna Install.

Solution Level 1 (< 5 minutes)
It is possible that this flag will be triggered occasionally and doesn't cause issues unless the GPS does not synchronize for an extended period that would cause the time to drift.
1. Make sure the GPS antenna is connected to the control box port labeled GPS or L and fully seated. See seated GPS antenna.
2. Check for damage to the GPS cable.
3. Run the GPS synchronization and verify the date and time are correct. See Model T GPS Synchronization

Solution Level 2 (more involved)
1. Open the control box and verify the internal GPS wire is connected. See Model T Internal Connections.

Solution Level 3 (last resort)
1. Replace GPS antenna (if available).
2. Return instrument for maintenance.