45
Installation and Maintenance
Service Manual
9. Maintenance
Note: When replacing the controller, be sure to insert the wire jumper into the new controller, otherwise the unit will display C5
9.1 Malfunction Analysis
The remote
controller does
not receive
signals (after it
is powered, the
buzzer will
sound, unless it
has
malfunction)
Trip of breaker or
blow of fuse
Air
conditioner
can
no
t
start
up
Measure insulation resistance
to ground to see if there is any
leakage.
The circuit or the part of the air
conditioner has malfunction.
They heat and break the insula-
tion and lead to short circuit or
creepage. Measure the insula-
tion resistance or eliminate the
malfunction one by one. If the
breaker itself has malfunction,
then replace the breaker.
The transformer connection is
loose or has bad contact or the
transformer has malfunction.
Fasten the wiring; measure the
output voltage of the trans-
former , if it is incorrect, change
the transformer.
No power
Check power supply circuit.
Power plug is not well plugged in
and poor connection.
Check if the plug is properly
plugged in and make the loose
contact firm.
Fuse of controller burnt out
The air condi-
tioner does not
react after it is
powered ( after
the plug is
inserted, the
buzzer does not
sound and the
remote startup
has no
response)
Remote controller malfunction
Receiver loose or poor connection
Receiver is broken
Change controller fuse
Controller is broken
Check remote controller
Remote controller is short of power
Change batteries
First, press the manual switch
button AUTO,if there is no
response,check based on the
above methods. If it runs nor-
mally after pressing the button,
check again whether the instal-
lation position and the connec-
tion wire of the reception head
is correct. If it is correct,then re-
place the receiver or the remote
controller.
Power voltage is too low
Check the voltage. If it is lower than 10% of
the rated voltage, check the cause, improve
the power supply condition and add the sta-
bilized voltage power supply.
The breaker trips at once when it
is set to “ON”.
The breaker trips in few minutes
when it is set to “ON”.
