Delta DTR015S21A is a single‑phase 8 / 6 A variable frequency drive (VFD) inverter rated for 0–240 VAC, 1–400 Hz, commonly used in small motor drives and washer applications. Known failure modes for this model include overheating of the IGBT modules, capacitor degradation on the DC link, and insulation breakdown between the input/output windings; common symptoms are tripping of the over‑current protection or a “no drive” status on the panel display. First‑check diagnostics: verify that the AC input voltage is within spec and that the main fuses/over‑current relays are intact; inspect the DC link for visible signs of capacitor bulging or leakage, and confirm proper operation of the motor output by measuring the phase currents and checking for any error codes on the drive’s LCD panel.[oss-gpt-20b]