Trouble Shooting - Air-Con 38B Service Manual

Trouble shooting

NO
Is the unit display
normal?
YES
Does outdoor unit run?
YES
Does the
compressor run
normally?
YES
Does the indoor
unit run?
NO
Check the failure code
according to the failure
table
NO
Check the
compressor ,wires
and it' s
capacitor.
YES
Normal
NO
Trouble
Is the power
applied to the unit?
YES
Is the power normal? check
the voltage between L&N of
terminal block
YES
Press the power ON/OFF button
of wire control or remote control
Does the beeper
beep?
YES
Is the display all
off?
YES
Check the connector on display
PCB connected to control PCB
Check the display PCB itself
37
NO
Check power supply mains or
interconnection wires
NO
Check the wiring of indoor and
outdoor
Does the control
ok?
NO
Does the control
PCB ok?
Control PCB failure
NO
Control failure
YES
NO