FAQs : Split Systems Noise is heard (Indoor unit)
During operation and immediately after stopping the unit, the sound of water flowing in the air conditioner's piping may be heard. Also, noise may be particularly noticeable for about 2-3 minutes after starting operation (sound of coolant flowing).
During operation, a slight squeaking sound may be heard. This is the result of minute expansion and contraction of the front cover due to temperature changes.
During Heating operation, a sizzling sound may be heard occasionally. This sound is produced by the Automatic Defrosting operation.