The Zapi FC2086A‑NA is a 24 VDC motor controller rated at 150 A/150 A MPB SX designed for forklift or industrial vehicle applications. Common failure points for this class of controllers include burned MOSFETs, damaged gate driver ICs, and degraded heat sink mounting; the unit’s diagnostic handset (available through Hyster/Yale dealers) can read fault codes and reset parameters. First‑check diagnostics: verify 24 VDC input voltage and polarity; inspect the board for visible burn marks or loose connections on power MOSFETs and gate drivers; and use the diagnostic handset to pull error logs, looking for codes related to over‑current, over‑temperature, or communication faults.[oss-gpt-20b]