Generac OH4343 Controller

The Generac OH4343 is a digital controller PCB used in 10‑kW to 20‑kW standby generators, handling start/stop sequencing, voltage regulation, and communication with the generator’s engine management system. Common failure points include burnt or cracked traces on the power input section, failed MOSFETs or op‑amps in the voltage regulator, and corrosion or loose solder joints at the I/O connectors. First‑check diagnostics: verify 120 V/240 V supply to the board with a multimeter; inspect for visible damage or overheating on IC packages and power components; and review any diagnostic LEDs or fault codes displayed on the panel or transmitted via CAN/Ethernet.[oss-gpt-20b]

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We specialize in the repair and refurbishment of high-end industrial control electronics and power systems like this unit.

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