Talley 883383B 3-70106-002 Humidity Controller

Talley 883383B (part 3‑70106‑002) is a compact industrial humidity controller used in HVAC and dehumidification systems to maintain setpoint levels via relay or solid‑state output. Common failure modes for this class include burnt capacitors, failed MOSFETs on the control board, degraded thermistor accuracy, and corrosion of I/O contacts from high‑humidity environments. First‑check diagnostics: verify 24 V DC power supply continuity to the board, inspect the main relay or solid‑state output for mechanical wear or arcing, and confirm the thermistor resistance matches spec at room temperature; then review any stored fault codes via the controller’s diagnostic LED or serial interface.[oss-gpt-20b] Post Comment

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