Service manual

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YES
NO
YES
NO
NO
YES
YES
NO
Replace the lead wires.
Replace the compressor and
compressor inverter PC board
(A2P) at the same time.
Replace the inverter PC board
(A2P).
Replace the compressor inverter
PC board (A2P) and fan inverter
PC board (A5P).
Replace the inverter PC board
(A2P).
YES
NO
It is supposed that the malfunction
results from external causes other
th
an failures (e.g. exogenous
noises or thunder).
YES NO
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
∗
∗
∗
Check 4
Turn OFF the power supply
once, and then check the
compressor lead wires.
Turn ON the power supply
again.
While in monitor mode, check
whether the system is right-
hand (control PC board 1) or
left-hand (control PC board 3).
While in monitor mode,
check the outdoor unit
concerned.
Single system Multi system
Do the
lead wires have
any disconnection, broken
wire, short circuit, or
ground fault?
Does the
power supply normally
come back ON?
Is the single
system applied to the outdoor
unit?
Check 4
Check if the power
transistor is normal.
Check if
insulation
resistance of the
compressor is 100kΩ
and above.
: Referring to the information on P349.
Check 4
Check if the power
transistor of the fan driver
is normal.