AFS120FX
3 – 4
Fan motor noise.
Fan
Replace the fan if cracked, out of balance, or partially missing.
Blower
Replace the blower 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.
The compressor not to
stop even the room tem-
perature has got to the
setting temperature.
Room temperature sensor
Check and replace if the temperature is open or damaged.
Main PCB
Check and replace the main PCB if the relay on PCB is shorted or damaged.
Compressor will not run
while fan motor runs.
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.
Capacitor (Discharge capaci-
tor 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 warmest (in
heating mode). Set it if not.
Compressor
Check the compressor for open circuit or ground. If open or grounded, replace the
compressor.
Insufficient cooling.
Air filter
Clean or replace if restricted.
Vent. Door
Close if open.
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 /-10% of manufactures rating.
Room structure
Take proper measures 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.
Sunlight
Add a awning if the condenser is exposed to the sunlight.
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 temperature appropriate if
the evaporator is frosted. Replace if blocked. Repair joint if leaking.
Compressor
The inlet and outlet valve of the compressor is damaged, making the low pressure
connected with the high pressure. The refrigerating system can not produce high pres-
sure and low pressure. Replace the compressor after checking for the reason.
Heat sources
Reduce if too many.
Excessive noise.
Copper tubing
Remove the cabinet and carefully rearrange tubing not to contact cabinet, compressor,
shroud and barrier.
The unit starts and stops
frequently.
Power supply
The input power supply voltage is too low. Call an electrician if not within limits.
Main PCB
Check and replace the main PCB if the relay on PCB is shorted or damaged.
Outdoor temperature
When the outdoor temperature is too high, the compressor will protect.
No cooling.
No power
Check the voltage. Call an electrician if no within the limit.
Wiring
Check the terminals. Repair and correct if loose.
Temperature setting
Check and adjust the temperature setting.
Mode setting
Check and adjust the mode setting.
Main PCB
Check the voltage of main PCB. Replace the main PCB when the unit failure in heating
mode.
PROBLEM
POSSIBLE CAUSE
REMEDY
