Error code
FP 8 °C frost-protection status
Applies to 4 models
Aero 503 I CN, Aero 504 I CN, Aero 503 O CN, Aero 504 O CN
What this means
Frost protection is active and maintains the room at a minimum of 8 °C. This is no error or fault.
What you can check yourself
- No action is needed unless you want to exit frost protection; press the power, operating-mode, or another remote-control button.
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 FP.