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Guided Diagnostics
5-10 min · 9 steps

Danfoss AK-PC: Discharge Pressure High (3411 / 3431)

Walk a Danfoss AK-PC pack controller high discharge pressure / HP switch alarm from the display code to the root cause.

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First step

Are all gas-cooler / condenser fans commanded AND physically running?

No — one or more fans stopped
Yes — all fans running

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.