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The power is applied to the unit
Check the voltage between and
of terminal block
N
L
Check the
Breaker or Fuse
Self Diagnostic
function is ON
Check according to
self Diagnostic function
Control P.C.B defect
Check the indoor unit display
is the display all off?
Press the ON/OFF switch of
Remote Control
Is the indoor unit display all off?
Pull out the power plug
and then insert the power plug
after 5 second
Control P.C.B is normal
Recheck from the beginning
Rating voltage more than 90%
Rating voltage
under 90%
No No
No
Yes
Yes
1
Neither Indoor Unit nor Outdoor Unit Runs