Specifications

128
ii ) Diagnosis of Refrigerant Circuit / Application
There might be some causes where the unit starts running but does not perform satisfactorily, i.e. insufficient
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
Restricted
Insufficient cooling
Air
circulation
Indoor / outdoor coil dirty
(clogged)
Indoor air filter dirty
Clean the coil
Clean the filter
Fan motor malfunction
Obstruction at air inlet /
outlet of indoor / outdoor
unit
Change or repair the motor
Remove the obstruction
High cooling
load
Excessive heat source.
e.g. electric kettle
Room overcrowded with
people
Windows / doors wide
open
Remove or reduce heat source
Reduce number of people in the room
Close the windows / doors
Refrigerant
circuit
Restriction e.g. at
strainer, capillary, filter
dryer, etc.
Refrigerant short charge
or refrigerant leakage
Add refrigerant. Repair leakage if detected
Repair clogging or replace faulty components
Compressor
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 )