Symptom-based Troubleshooting ESIE12-06172 Service Diagnosis2.9 Equipment Produces Loud Noise or VibrationApplicable Model All models of SkyAir seriesSupposedCauses Defective installation Overcharge of refrigerant Air mixed in refrigerant system Flushing noise due to refrigerant shortage. (Sound of shoo...)Troubleshooting[Power supply side][Installation work side]Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.CautionYES Correction of installation.Reinforcement for ceilings orwallsNONONONONONOYES Insert shock absorber inmounting section, or strengthenthe mounting section.NONONONOIs the piping secured? NO Insert cushion materials to thepipe support such as saddle.YES Disassemble and remove partscontact.YES Correct piping manually orattach a dead weight to pipe.YES Normal.YESNormal. The sound is flushingnoise of gas (refrigerant) insideair conditioning unitYESNormal. The noise is a soundgenerated at the time of gas(refrigerant) flow change or stop.YESNormal. Operation sound ofdraining deviceYESNormal. Creak generates byshrinkage of resin parts due totemperature change.YESIt is normal.YESAfter vacuum drying, chargecorrect amount of refrigerant.* Overcharge of refrigerant* Air mixed in refrigerant system* Flushing noise due to refrigerantshortage.(Sound of shoo...)Does thenoise generate with vibrationof whole ceilings andwalls?Does thenoise generate withvibration of unit mountingsection?Does the fan contactwith other parts?Does the pipecontact with casing?Is thenoise flushing soundfrom pressure reducing valve orcapillary tube?Continuousslight noise of "shoo..." duringcooling or defrostingSound of"shoo..." generates justafter operation start or stop, ordefrosting start or stop.Sound of"shoo..." generates duringcooling or after operationstop.Creak duringheating and after operationstopIs this animpact noise at the start/endof defrosting?
