PROBLEM POSSIBLE CAUSE REMEDY
Air filter Clean or replace if restricted.
Discharging pipe
Check outdoor wind discharging pipe, the tie-in, the air discharger.
Correct if any problem. Replace if damaged.
Unit undersized
Determine if the unit is properly sized for the area to be cooled or
heated.
Condenser and Evaporator Clean or replace if restricted.
Fan motor
Check the fan capacitor and replace if not within +/-10% of
manufactures rating.
Room structure and window kits
installation
Take proper measures or re-installate the windows kits to make the door
and windows sealed well if gap is found.
Air flow
Clean or remove if any barrier is found to block the inlet/outlet wind flow
of the unit.
Less refrigerant
Check the tubes for reasons of leakage. Recycle the refrigerant, correct
the leakage points and recharge.
Capillary tube
Regulate the flow if capillary tube and make the evaporating temerature
appropriate if the evaporator is frosted.
Compressor
The inlet and outlet valve of the compressor is damaged, making the low
pressure connected with the high pressure. The refrigerating system is
difficult to produce high pressure and low pressure. Replace the
compressor after checking for the reason.
Heat sources Reduce if too many.
Electric heater
Check the two over temp protectors. Replace if damaged. Replace after
the heater is checked faulty.
Refrigerant
The amount of the refrigerant is too much, making the compressor load
too big. Recycle and recharge the refrigerant after checking for the
reason.
Over-current protector Replace after checked failure.
Compressor The compressor is seized. Replace after checking for the reason.
Room temprature sensor Check and replace if the temprature is open or damaged.
Water depth controller switch
Check whether the water tank is in correct postiong. Replace the water
depth controller switch if checked failure.
Main board Check and replace the main board after checked failure.
Power supply
The input power supply voltage is too low. Call an electrician if not within
limits.
Main board
Check and replace the main board if the RL4 relay on main board is
shorted or damaged.
No power Check the voltage. Call an electrician if no within the limit.
Wiring Check the termianls. Repair and correct if loose.
Temperature setting Check and adjust the temperature setting.
Mode setting Check and adjust the mode setting.
Over-current protector Replace after checked failure.
Capacitor (Discharge capacitor
before testing)
Check the capacitor.
Replace if shorted, open, or damaged.
Compressor The compressor is damaged. Replace after checking for the reason.
Water depth controller switch
Check whether the water tank is in correct postiong. Replace the water
depth controller switch if checked failure.
Main board
Check the voltage of RL2 and RL3 on main board. Replace the main
board when the unit failure in heating mode.
Electric heater
Check the two over temp protectors. Replace if damaged. Replace after
the heater is checked faulty.
LCD is not clear LCD malfunction Replace LCD.
Transformer failure Check output voltage of transformer and replace after check faiulure.
Swing motor Replace after checked failure.
Wiring Correct according to wiring diagram.
Main board
Check the voltage of P1 on main board. Replace the main board after
checked failure.
Vertical louver is blocked Clean and repair after checked faulty.
PROBLEM SOLVING
12
No cooling or heating.
Insufficient cooling or
heating.
Stop instantly after
startup.
The compressor not to
stop even the room
temperature has got to
the setting temperature
or the water tank is full.
The unit starts and stops
frequently.
No auto swing
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