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11. Trouble shooting
PROBLEM
POSSIBLE CAUSE
REMEDY
Power failure
Check the power supplier if the power supplier is supplied to the
unit. Check the power cord and correct if damaged.
Transformer (Discharge
transformer before testing)
Check resistance between the two input/output lines on
transformer. Replace the transformer if either of the input/output
is open or the transformer is damaged.
No power display
on panel or any one
of the buttons
failure.
Display board or main PCB
failure
Check the voltage on display board. Replace the display board if
it is +5V else replace the main PCB.
Remote control
failure.
Battery failure
Check the voltage of battery. Replace batteries if the voltage is
lower than 2.3V.
Check voltage. Call an electrician if not within limits.
Test capacitor.
Replace if not /-10% of manufacture's rating.
Check bearings. Replace the motor if the blower wheel cannot
rotate freely.
Fan motor runs
intermittently
Cycles on overload.
Pay attention to any change from high speed to low speed.
Replace the motor if the speed does not change.
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.
Compressor stops
instantly after
startup.
Compressor
The compressor is blocked inside. Replace after checking for
the reason.
No power
Check voltage at electrical outlet. Correct if none.
Water alarm
Check and correct if water alarm happens.
Power supply cord
Check voltage at the power cord terminal on Main PCB.
Replace the power cord if none.
Transformer (Discharge
transformer before testing)
Check resistance between the two input/output lines on
transformer. Replace the transformer if either of the input/output
is open or the transformer is damaged.
Wire disconnected or
connection loose
Connect wire. Refer to wiring diagram for terminal
identification. Repair or replace loose terminal.
Main PCB failure
Select fan speed and Check the voltage on main PCB. Replace
the main PCB if no voltage in anyone.
Capacitor (Discharge
capacitor before testing)
Test capacitor.
Replace if not /-10% of manufacture's rating. Replace if
shorted, open or damaged.
Fan motor will not
run.
Will not rotate
Fan blower hitting scroll. Realign assembly.
Check fan motor bearings. Replace the motor if motor shaft do
not rotate.
Fan blower
Replace the fan blower if cracked, out of balance, or partially
missing.
Loose screws
Tighten them.
Fan motor noise.
Worn bearings
Replace the motor if knocking sounds continue when running or
loose, or the motor hums or noise appears to be internal while
running.
Voltage
Check voltage. Call Supply Authority if not within limits.
Wiring
Check the wire connections, if loose, repair or replace the
terminal. If wires are off, refer to wiring diagram for
identification, and replace. Check wire locations. If not per
wiring diagram, correct.
Main PCB failure
Check voltage of main PCB. Replace the main PCB if open.
Compressor will
not run while fan
motor runs.
Capacitor (Discharge
capacitor before testing)
Check the capacitor.
Replace if not /-10% of manufacturers rating. Replace if
shorted, open, or damaged.
