The Hetronic CS 434 is a momentary‑on emergency stop transmitter used in industrial safety and remote control applications. Common failure points for this class of RF transmitters include power supply degradation, antenna or connector corrosion, internal firmware corruption, and interference from nearby radio sources. Begin troubleshooting by verifying the 12 V DC input voltage with a multimeter, inspecting the antenna and coaxial connectors for physical damage or loose contacts, and checking the transmitter’s status LEDs or error codes per the operating manual. If the unit still fails to transmit, perform an RF sweep to detect interference and consider re‑pairing or replacing the module.[oss-gpt-20b]