— 13 —
3. The unit is working, but not cooling and heating sufficiently
(Both blower and compressor are working)
WHAT TROUBLED
COMPLAINTS
HOW TO CHECK
REMEDY
Load
Air flow
Short air volume
Refrigerant
Air passage
Air filter
Much Cooling or Heating
load
Obstacle disturbs Intake
of uniform airflow.
Reverse rotation of
blower.
Shortage in the charged
refrigerant.
Improper or foreign bodies
Clogged with dust
Heat load increased.
Window or door has many
cracks or gaps.
Checking
Checking
Coil inlet pipe is frosted
Checking
Checking
Do necessary disposal
respectively.
Correct it.
Correct it.
Recharge it.
(Repair the leakage spot).
Correct or clear the
foreign bodies.
Cleaning
4. All the functions are performed as specified, but very noisy and vibrant
WHAT TROUBLED
COMPLAINTS
HOW TO CHECK
REMEDY
Compressor
Blower
Screws
Electric troubles
(Magnetic contactor)
Others
• Checking
Checking
Checking
Checking
Improper installation
Checking
• Replace the
compressor
Repair or replace it.
Clear the foreign bodies.
Correct
Repair and clean or
replace it.
Correct it.
Liquid refrigerant flooding
back from the evaporator.
Faulty Discharge valve
and suction valve.
Fan broken.
Foreign matters intruded.
Looseness or fail-off of
screws
Defective contact.
Defective contact point.
Rusting and foreign mat-
ters in the iron core con-
tact face. Defective con-
tact of the
operating switch.
• Check for refrigerant over-charge.
• Check to see if the intake air temperature is
extremely cold.
• Check for insufficient air flow quantity.
Troubleshooting Guide
