Samsung AM FNTD Series User Manual page 29

Internal protections via the unit control system
This internal protection operates if an internal fault occurs in the air conditioner.
Type
Against cold air
De-ice cycle
Anti-protection of internal
battery
Protect compressor
If the heat pump is operating in Heat mode, De-ice cycle is actuated to remove frost from an outdoor unit
that may have deposited at low temperatures.
NOTE
The internal fan is switched off automatically and restarted only after the de-ice cycle is completed.
When de-ice cycle is operating,it may make strange sound. It is normal operation for the product safety.
The internal fan will be off to against cold air when the heat pump is heating.
The internal fan will be off to against cold air when the heat pump is heating.
The compressor will be off to protect internal battery when the air conditioner
operates in Cool mode.
The air conditioner does not start operating immediately to protect the
compressor of the outdoor unit after it has been started.
Description
29