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Noise - Sizzling (Heating defrost)

Noise heard (Heating mode) — Sizzling sound during Automatic defrosting

Fujitsu · Air Conditioners

What does Noise - Sizzling (Heating defrost) mean?

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.

Common Causes

  • Automatic defrosting operation is active, causing ice on the outdoor coil to melt and potentially create a sizzling sound.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    This is a normal sound indicating the unit is performing a necessary defrosting function.

  2. 2

    Do not intervene or attempt to stop the defrosting cycle.

  3. 3

    The sizzling sound will stop once the defrosting operation is complete.

Browse all codes in this manual (118)
Verified technical data. Last updated: April 2026

Related Faults

11Error 11 — Serial communication error (Indoor unit not sending signal)12Error 12 — Wired Remote Controller Communication Error18Error 18 — External communication error
Source: Fujitsu Air Conditioners
Open Manual (Page 14)Search more codes in this manual