Air-Con 38B Service Manual page 38

Indoor unit and outdoor unit don' t operate
Does the electric switch
cut off after a few
nimutes?
YES
NO
Reconnect the wires.
Find the reason and
NO
replace the failure
componet.
NO
Rreplace the failure
componet.
Does the electric switch
cut off?
YES
Is the wires of indoor
unit and outdoor unit no
problem?
YES
Is the insulation of
indoor unit and outdoor
unit no problem?
YES
YES
Is the resistance of each
main component no
problem?
Indoor and outdoor unit
don' t operate
Is the power supply no
problem?
YES
Change a good remote,
does the air conditioner
running?
NO
Press emergency key, does
the air conditioner
running?
NO
Does the fuse of indoor
PCB burn out?
NO
Does the transformer has
output?
YES
Does the 12V and 5V of
indoor PCB have?
YES
normal
38
NO
Make the power
supply ok.
YES
Replace remote
control.
Replace remote
YES
receiver or display
panel.
YES
Replace fuse of
indoor PCB.
NO
Replace transformer.
NO
Replace PCB.