Troubleshooting flow

VAN TOO HOT

Is supply air cold? No -> filter/coil/airflow/controller/voltage/refrigeration diagnosis. Yes -> measure zonesplit.Rear cold, front hot? Run all fans -> clear return path -> shade windshield -> inspect forehead/cab load.All zones warm? Close exhaust/openings -> confirm condenser airflow -> reduce solar/internal load ->compare capacity vs conditions.High current or shutdown? Stop -> measure voltage drop -> inspect thermal hotspots -> condenser/coilairflow -> event code/BMS limit.Water/frost? Stop safely -> drain/airflow/humidity -> professional refrigeration diagnosis when indicated.

Never bypass a fuse, low-voltage cutoff, pressure control or thermal protection to keep cooling running.