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Diagnosis/Process flowchart Item
Preparation
Check
Check
Operation
Measurement
Check
Stop
Check
Measurement
Contents
Turn “OFF” the power breaker,
and remove 3P connector
which connects inverter and
compressor.
• Check whether 25A fuse on
the control board assembly
is blown or not. (F01)
Check whether 15A fuse on
the control board assembly
is blown or not. (F03)
• 15A fuse (F03) on the
control board is provided for
power factor improvement
control circuit. The operation
continues even if fuse is
blown.
Turn on power breaker, and
operate the air conditioner in
COOL mode by short-circuit of
the timer.
Measure terminal voltage of
the electrolytic capacity.
500µF:400WV x 3
After operation, turn off the
power breaker after 2 minutes
20 seconds passed, and
discharge the electrolytic
capacity by soldering iron.
Check voltage between motor
phases.
• Is not winding between
Q
-
R
,
R
-
S
, or
Q
-
S
opened
or short-circuited?
• Is not frame grounded with
Q
,
R
, or
S
?
Summary
If fuse was blown, be sure to
check the electrolytic
capacitor and diode block.
(DB01)
• Connect discharge
resistance (approx.
100Ω40W) or soldering
iron (plug) between +, –
terminals of the electro-
lytic capacitor (500µF) of
C14 (with printed CAU-
TION HIGH VOLTAGE) on
P.C. board.
If 15A fuse is blown,
discharge both edges of
the electrolytic capacitor
with soldering iron.
OK if 500µF
→→
→→
→
DC280 to 320V
Remove CN300 while
pushing the part indicated
by an arrow because CN01
is a connector with lock.
→→
→→
→ Resistance between
phases should be approx. 55
to 77Ω
→→
→→
→ Should be 10MΩ or more.
Replace
outdoor
fan motor.
Remove
connector of
compressor.
NG
NG
NG
NG
NO
NO
OK
OK
OK
OK
YES
YES
Check 25A fuse
(Part No.F01).
Does outdoor
fan rotate?
Replace fuse.
Check
electrolytic
capacitor, diode
block (DB01),
etc.
Check
electrolytic
capacitor, diode
(DB01),
etc.
Replace control
board assembly.
Remove connector
CN300 of outdoor fan
motor, and using a
tester, check resistance
value between every
phases at motor side.
Check
15A fuse
(Part No.F03).
Check
terminal voltage
of electrolytic
capacitor.
Does LED on control
board flash or go on?
CBA
Discharging position
(Discharging period
10 seconds or more)
Plug of
soldering
iron
10-7. How to Diagnose Trouble in Outdoor Unit
10-7-1. Summarized Inner Diagnosis of Inverter Assembly