The Farm Works 900‑B Dyne Charge Electronic Fence Controller is a low‑impedance AC‑powered charger that delivers up to 120 miles of fence coverage and displays status via an LED panel. Common failure modes for this model include loss of output voltage due to degraded internal capacitors, miswired grounding causing high‑resistance faults, and power supply issues (e.g., faulty transformer or blown fuse). First‑check diagnostics: verify the AC input voltage and ensure the unit’s internal fuse is intact; inspect the ground rod connection and confirm low resistance between the controller’s output ground terminal and the fence line; review any LED fault codes displayed on the panel to pinpoint component failures.[oss-gpt-20b]