–31–
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 heat load
Obstacle disturbs Intake
of uniform wind.
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.
Replenish it.
(Repair the leakage spot).
Correct or clear the
foreign bodies.
Cleaning
9.4 All the functions are performed normally, but very noisily and much vibratively.
WHAT TROUBLED
COMPLAINTS
HOW TO CHECK
REMEDY
Compressor
Blower
Screws
• Checking
• Checking
Checking
Checking
• Remove the shipping
bracket.
• Replace the
compressor
• Repair or replace it.
• Clear the other
material
Repair
Liquid refrigerant flooding
back from the evaporator.
Compressor shipping
bracket is not removed.
Faulty discharge valve and
suction valve.
Fan broken.
Other materials intruded.
Looseness or fail-off of
screws
• Check for refrigerant over-charge.
• Check to see if the intaking air temperature is
extremely cold.
• Check for insufficient air flow quantity.
