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error Danfoss
Error Code E31
Error on air sensor, S2.
? What Causes This
Faults in the ambient temperature sensor (S2) leading to erroneous readings or connection problems.
✓ How to Fix It
Diagnose and resolve issues with sensors or wiring. Replace faulty equipment if found.
Source: page 6 of the official manual
From the manual
This error code appears in:
Danfoss Optyma Control