Vanner IT12‑3200 is a 12 VDC‑input, 3.2 kW pure sine‑wave industrial inverter used to power compressors, motors, and test equipment from a vehicle or portable battery bank. Common failure points for this class include overheating of the MOSFET bridge, degradation of the DC input capacitor, and failure of the internal temperature sensor or over‑current protection circuitry; these can manifest as sudden shutdowns, high output ripple, or no AC output at all. First‑check diagnostics: verify that the 12 V supply is within spec and stable under load, inspect the inverter’s heat sink and airflow for signs of overheating, and review any fault codes displayed on the LCD panel or transmitted via RS‑232/Modbus to identify over‑current or temperature triggers.[oss-gpt-20b]