Staefa NRUD HVAC Controller

The Staefa NRUD is an industrial HVAC controller that delivers a regulated 10 VDC output (up to 2 A) for precise temperature and fan control in building automation systems. Common failure points on this class of controllers include power‑supply board degradation, capacitor burn‑outs, and solder joint fatigue on the I/O pins; overheating can also cause internal fuse trips or relay wear. Begin diagnostics by verifying that the unit receives its rated 24 V AC input (or 12–15 V DC if specified), checking for any blown fuses or tripped breakers, then inspecting the board for visible burn marks, cracked components, or loose connections before proceeding to I/O continuity and output voltage checks.[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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