a04 on Danfoss AK-CC55 Compact: meaning and checks

First checks, in order

The checks below are a REFTHE editorial path to compare with the machine diagram, configuration and manual.

1. Preserve the initial configuration and identify the parameter or function referenced by the code.
2. Compare wiring, I/O assignment and controller variant with the approved diagram.
3. Do not copy parameters from another system or similar model without a point-by-point check.

What the code does not prove

The code directs the investigation but does not, by itself, prove that a probe, valve, controller or other component is faulty.