PROBLEM
POSSIBLE CAUSE
REMEDY
No power
Check voltage at electrical outlet. Correct 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.
Battery failure
Check the voltage of battery. Replace batteries if the voltage is lower
than 2.3V.
No power
Check voltage at electrical outlet. Correct if none.
Power supply cord
Check voltage at the power cord termianl on Main board. 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 termianl identification. Repair
or replace losse terminal.
Main board failure
Select fan speed and Check the voltage of CN11 on main board. Replace
the main board if no voltage.
Capacitor (Discharge capacitor
before testing)
Test capacitor.
Replace if not /-10% of manufacture's rating. Replace if shorted,
open or damaged.
Will not rotate
Fan blower hitting scroll. Realign assembly. Check
fan motor bearings. Replace the motor if motor shaft don't rotate.
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 fan blade cannot rotate freely.
Pay attention to any change from high speed to low speed. Replace the
motor if the speed does not change.
Fans
Replace the fans if cracked, out of balance, or partially missing.
Loose screws
Tighten them.
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.
Copper tubing
Remove the cabinet and carefully rearrange tubing not to contact
cabinet, compressor, etc.
Discharging pipe
Check outdoor wind discharging pipe, the tie-in, the air discharger.
Correct if any problem. Replace if damaged.
Parts loosen
Tighten them.
Compressor
Replace after checked failure.
The ground is not level or not flat
enough
Place the unit on a flat, level ground.
Voltage
Check voltage. Call an electrician 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 board failure
Check voltage RL4 of main board. Replace the main board if open.
Capacitor (Discharge capacitor
before testing)
Check the capacitor.
Replace if not /-10% of manufacturers rating. Replace if shorted,
open, or damaged.
Room temp sensor
Check the temperature setting if not at the coolest (in cooling mode) or
the heatest (in heating mode). Set it if not.
Pipe temp sensor
Check whether the evaporator is blocked. Check the pipe temp sensor
and replace if open circuit.
Water depth controller switch
Check whether the water tank is in correct postiong. Replace the water
depth controller switch if checked failure.
Over-current protector
Replace after checked failure.
Compressor
Check the compressor for open circuit or ground. If open or grounded,
replace the compressor.
PROBLEM SOLVING
Check the voltage of CN7 on main board. Replace the display board after
checked faulty else replace the main board.
Fan motor will not run.
Remote control failure.
Display board or main PCB failure
No display on panel or
any one of the button
failure.
11
Revolves on overload.
Fan motor runs
intermittently
Fan motor noise.
Compressor will not run
while fan motor runs.
Excessive noise.
