The Advance Industries 116220 D is a logic‑timer/PLC add‑on board used in industrial machine control and gate‑operator systems; it features a red LED status indicator and a built‑in programmable timing wheel. Common failure points on this model include degraded timer winding or capacitor decay, over‑voltage damage to the onboard ICs, and loose or corroded power‑rail connections that can cause intermittent operation or a permanently off LED. First‑check diagnostics: verify 24 V DC input with a multimeter, inspect all solder joints and connectors for cracks or corrosion, and test the timing wheel resistance against spec; if the board still fails, review any error codes displayed on the host PLC or HMI for clues to a specific fault line.[oss-gpt-20b]