Fujitsu · Air Conditioners
In heating mode, a sizzling sound may be heard. This sound is produced by the automatic defrosting operation, which is a normal function to remove frost from the outdoor unit.
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This is a normal sound indicating the unit is performing a necessary defrosting function.
Do not intervene or attempt to stop the defrosting cycle.
The sizzling sound will stop once the defrosting operation is complete.