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Troubleshooting M5MSY-2010
ii ) Diagnosis of Refrigerant Circuit / Application
There might be some causes where the unit starts running but does not perform satisfactorily, i.e. insuffi cient
cooling. Judgement could be made by measuring temperature difference of indoor unit’s intake and discharge
air as well as running current.
: Faulty : Check : Cause : Remedy
Insuffi cient cooling
Indoor/outdoor coil dirty
(clogged)
Indoor air fi lter dirty
Restriction e.g. at strainer,
capillary, fi lter dryer, etc.
Restricted
Compressor
Refrigerant
circuit
High cooling
load
Air
circulation
Clean the coil
Clean the fi lter
Fan motor malfunction
Change or repair the motor
Obstruction at air inlet
/outlet of indoor / outdoor
unit
Remove the obstruction
Excessive heat source.
e.g. electric kettle
Remove or reduce heat source
Room overcrowded with
people
Reduce number of people in the room
Windows / doors wide
open
Close the windows / doors
Refrigerant short charge
or refrigerant leakage
Add refrigerant. Repair leakage if detected
Repair clogging or replace faulty components
Less or no compression
(Low running current)
Replace compressor
Satisfactory operation with temperature difference of air
intake & discharge of indoor unit 8°C to 13°C. *
( * value is for reference only )
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