Error code
dF Automatic defrost active
Applies to 6 models
Aero 704 O, Aero 705 O, Aero 704 I, Aero 705 I, Aero 704 IB, Aero 705 IB
What this means
The unit is automatically defrosting; this is a normal operating status and not an error.
What you can check yourself
- No action needed — allow the automatic defrost cycle to finish.
Still not resolved? Contact a qualified installer or servicer.
See the official IVT manualA deep link to the manufacturer's own PDF for full technical detail. We link to manuals, we never host them.
Using Claude Code or Meta Muse? Connect HeatPump AI and ask it about dF.