Service Manual
Installation and Maintenance
40
9.2 Malfunction Analysis
Air-conditioning
unit does not run
No power supply
Check if
switch is in off position, if socket and plug
is disconnected, and check if power supply failed or
cut off.
Fuse burn-out
Replace fuse
Power voltage is too low
Checkpower voltage. If it is 10% belowrated
voltage ,inspect and repair line
Switch failure
Failure of crystal oscillator or reset circuit
Replacecomponentswith failure
Connecting lineis loose or incorrect.
Correct wrong connection by referring to
the electrical diagram attached on unit
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Controller is broken
Replacecontroller
is running but there
is no cooling effect
(or no heating effect)
Air conditioning unit
Temp contrller is improperlly adjusted
Adjust temp lower (or higher during heating)
Too much dust on filter
Clean filter
Blockage of heat exchanger
Clean the dust on the surface of heat
exchanger
Fan speed is set too low
Set f
an speed at middle or high
Fan doesn't run or fan speed is too low
1. Wrong connection of wire 2.If capacitor is
broken 3.Malfunction of motor
Correct wire connection or replace broken
parts
Check if option switch (ON, OFF) is disconnected
with line, has mechanical failure;use universal
meter to check if contacts of switch are conducting;
if not, replace it with a new one with the same
model and spec.
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