5
1.Items
1 Check if the input voltage is correct?
2 Check if the AC power supply connecting is correct?
3 Check if the output voltage of the manostat L7805(IC2)is correct?
2.Trouble shooting procedure
Pull out the power plug and replug
it after some 5 seconds
Does the buzzer ring?
Is the LED lighten?
Has the signal been sent
Does the air-conditioner start operating
after pressing the ON/OFF button of the
remote control?
normal
5-2 No Power Display
17
5.Troubleshooting Guide
Refer to the trouble-shooting
of the remote control
Check the connection
between power supply cord
and the connecting terminal,
then check the fuse
Is the primary voltage on
Cn2 normal?
Is the transformer OK?
Is the DC voltage on the
PCB board OK?
Replace the
PCB board
Are the voltage of micro-controller
#8(compressor),#2(4-way valve) and
#6(outdoor fan motor)normal?
Is the voltage(5VDC) of the #15
(indoor fan motor)normal?
Is the port voltage(0VDC) of the #3
normal?
Is the port voltage(5VDC) of the #7
normal?
Is the port voltage of the #27
normal?
Are the port voltage of the #4and #5
normal?
Replace the
micro-controller
Replace the buzzer
Does it run normally?
Are the voltage(IC4) of RY1(compressor) ,
RY3(indoor fan motor)and (outdoor fan
motor) normal?
Check the connection of
the compressor, indoor fan
motor and outdoor fan motor
Replace the Ry1,
RY3,and IC4
Is the output voltage of the IC2 normal?
Check PCB board
Replace the main
PCB board
Replace IC2
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