The Hetronic 057 634 45 is a remote control unit for Bomag trench rollers, providing operator‑controlled drive and braking functions via ergonomic hand‑held interface. Common failures reported on this model include intermittent signal loss due to worn button contacts, corrosion of the internal PCB connectors in dusty environments, and occasional firmware glitches that cause the controller to reset or lock up during operation. First‑check diagnostics: verify the power supply voltage and polarity at the unit’s input terminals; inspect all push‑button contacts for wear or debris; check the status LEDs and any error code displays for indications of communication faults or low battery warnings.[oss-gpt-20b]