Staefa Control System 091-60220-82 21296E board

The Staefa Control System 091‑60220‑82 (model 21296E) is a Smart II HVAC/Smoke control board used in commercial building automation to manage VAV and smoke detection functions. Common failures on this board include burnt capacitors or ICs on the power regulation section, damaged trace connections from the I/O relays, and degradation of the onboard microcontroller due to overheating or moisture ingress. Initial checks should verify 24 V DC supply integrity, inspect for visual signs of component damage or corrosion, and review any logged fault codes in the controller’s diagnostics panel.[oss-gpt-20b]

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