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Guided Diagnostics
5-10 min · 9 steps

Danfoss AK-SC 355: I/O Network Failure

Bring a controller / I/O board back online on the Danfoss AK-SC 355 site network — power, rescan, wiring, addressing.

Run this diagnostic — free
First step

Is the offline controller / board powered and its network LED lit?

No — no power / dead LED
Yes — powered

This is a preview of the first step. Run the full interactive diagnostic free — it walks you all the way to the likely root cause.

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For qualified refrigeration technicians. Always follow manufacturer procedures and local codes. R-290 (propane) and other flammable refrigerants require A3-rated tools and safety practices.