Error Cause Solution
Noise from Air valves Air flow is too high. Noise is not a problem in a correctly
sized and commissioned system. How-
ever, if air valves are closed (e.g. during
cleaning), a hissing noise may occur.
Pressure is too high over valve.
No silencer is fitted to main duct.
Frost icon in display
The system is in defrost mode, because low
outdoor temperatures entail a risk of ice form-
ing in the heat exchanger.
This is not an error, but a standard
mode. The function stops automatically
when the outdoor temperature rises.
Installation Guide Danfoss Air Units
VIEWB302 Danfoss Heating Solutions
18
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