ASCON Service Guide Book
84
ii) Diagnosis of Refrigerant Circuit/ Application
There might be some causes where the unit starts to run 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
Insufficient cooling
Air
Indoor/ outdoor dirty
(clogged)
Indoor air filter dirty
Obstruction at air inlet/
outlet of indoor/ outdoor
unit
Fan motor malfunction
Excessive heat source
e.g. electric kettle.
Room overcrowded with
people
Windows/ doors wide
open
Refrigerant short charge
or refrigerant leakage
Refrigerant
Restriction e.g. at
strainer, capillary, filter,
dryer, etc.
Compressor
Less or no compression
(Low running current)
Satisfactory operation with temperature difference of air
intake & discharge of indoor unit 8ºC to 13ºC.*
(* Value is for reference only)
Change or repair the
motor
Remove or reduce heat
Reduce number of
people in the room
Close the windows/
doors
Add refrigerant
Repair leakage if
detected
Repair clogging or
replace faulty
components
Repair compressor