There might be some causes where the unit starts running but does not perform satisfactorily, i.e. insufcient
cooling. Judgement could be made by measuring temperature difference of indoor unit’s intake and dis-
charge air as well as running current.
High cooling
load
Remo ve or red uc e heat s ource
Reduc e num ber of pe o ple in the roo m
Close the w indow s / doo rs
Refrigerant
circuit
Refrigerant short c har ge
or refrigerant leakage
Ad d refri gera nt. Repa ir l eak age if detected
Repa ir c loggin g or replace fa ult y c o m po nents
Com pre ss or
Less or no co mp ressi on
(Low runn in g cur ren t)
Replace c omp re ss or
Satisfactor y op eration with temp erature differenc e of air
intake & disch arge o f indoor un it 8°C to 13°C . *
( * value is fo r referenc e on ly )
: Faulty
: Check : Cause
: Remedy
Room over crowded with
people
Windows/doors wide open
Restriction e.g. atstrainer,
capillary, filter dryer, etc.
Obstruction
at air inlet / outlet of indoor /
outdoor unit
Excessive heat source.
e.g. electric kettle
Fan motor malfunction
Indoor air filter dirty
Indoor/outdoor coil dirty
(clogged)
Remove the obstruction
Clean the filter
Air
circulation
Insufficient cooling
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