Troubleshooting
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Phenomena Possible causes Correction method
Damaged fan capacitor, bad contact, damaged fan
motor, or failure of fan power supply line, causing
indoor fan not operating or operating at lower
speed, hence no cold air out or poor cooling
Check power line, each
switch, temperature
controller, terminal board,
replace capacitor/motor
High (low) voltage or wrong power supply wiring
or broken circuit causing compressor not
operating; or failure of compressor (e.g. motor
burnt down, jammed, damaged valve disc etc.)
Use AC voltage regulator,
replace damaged parts
Excessive cooling load Check expected cooling load
Set temperature too high Lower set temperature
Leaking refrigerant or closed shutoff valve,
clogged system
Check and repair leakage, or
open shutoff valve
Compressor failure (connecting HP and LP) etc. Replace compressor
Bad thermal insulation of indoor/outdoor unit
connecting pipe
Apply separate thermal
insulation for bid and small
pipes
Reversing valve failure Replace reversing valve
Improper air delivery pipeline design, installation
or user operation, causing reduced indoor air
delivery amount
Re-design or re-install air
delivery path; proper use of
air conditioning unit by user
(6) Poor or no heating in heating mode
Phenomena Possible causes Correction method
Excessive heating load Check expected heating load
Improper outdoor unit installation position
Re-install & ensure good
ventilation
Set temperature too low Increase set temperature
Clogging in heating cycling system
Again pump vacuum, fill
refrigerant or replace dirt/clogged
parts
Clogged air strainer Clean strainer periodically
Excessive dust accumulated on heat
exchanger
Clean by long hair brush or
compressed air
Poor or no
heating in
heating
mode
Small air flow in indoor heat exchanger Increase fan speed
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