Troubleshooting
- 98 -
Phenomena Possible
causes Correction
method
During heating, small openness of or closed air delivery
port in air conditioned room can cause higher
condensation pressure, and when serious, compressor
overload protection will act to shutdown compressor
Check and adjust
air port openness
Power voltage is low and less than 10% rated voltage,
causing increased current and action of overload
protection
Use AC voltage
regulator
Insufficient power grid capacitance
Increase power
grid capacitance
Compressor “jammed”, causing sharp increase of current
and action of protection
Replace
compressor
(5) Bad or no cooling in cooling mode
Phenomena Possible
causes
Correction
method
Improper OD unit installation position, e.g. direct
sunshine on unit, bad ventilation or obstruction
Reinstall, remove obstacle or
use rain shelter
Damaged or failed temperature sensor
Replace temperature sensor
Dust accumulated on air strainer in long operation
will reduce air cycle and lower evaporator heat
exchange efficiency, hence cooling effect
Clean strainer to remove
dust and let it dry in cool air
before reinstallation
Dust accumulated on air conditioner fins can
cause insufficient cold air cycle or bad heat
dissipation, hence lowering cooling effect
Use long hair brush or
compressed air to remove
dust
Clogged capillary in cooling cycling system
causing sudden failure of this system or lowered
cooling effect
Again pump vacuum, fill
refrigerant or replace
capillary (strainer etc.)
Refrigerant leakage due to bad welding of system
pipeline or damaged copper tube, bad sealing of
shutoff valve filling port sometimes
Carry out repair weld or
replace shutoff valve and fill
refrigerant after detection
Excessive refrigerant that cannot be totally
evaporated in evaporator, causing lowered heat
absorption capability and cooling effect
Drain excess refrigerant
Bad or no
cooling in
cooling
mode
Air mixed in system affecting heat exchange,
causing higher condensation pressure and lowered
cooling effect
Drain refrigerant, re-pump
vacuum and fill new
refrigerant
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