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10-7. How to Diagnose Trouble in Outdoor Unit
10-7-1. Summarized Inner Diagnosis of Inverter Assembly
Diagnosis/Process flowchart
Remove
connector of
compressor.
NG
Check 25A fuse
(Part No.F01).
OK
Check
NG
terminal voltage
of electrolytic
capacitor.
OK
capacitor, diode
NO
Does outdoor
fan rotate?
YES
Does LED on control
board flash or go on?
Remove connector
CN300 of outdoor fan
NG
motor, and using a
tester, check resistance
value between every
phases at motor side.
Replace
outdoor
fan motor.
A
B
Item
Preparation
Check
Check
Replace fuse.
Check
electrolytic
capacitor, diode
block (DB01),
etc.
Check
electrolytic
(DB01),
etc.
Operation
YES
Measurement
NO
Check
Stop
OK
Check
Measurement
C
Table 10-7-1
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)
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
‚
‚
ƒ
ƒ
,
-
, or
-
or short-circuited?
• Is not frame grounded with
‚
ƒ
,
, or
?
– 56 –
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.
Discharging position
(Discharging period
10 seconds or more)
OK if 500µF → → → → →
DC280 to 380V
Remove CN300 while
pushing the part indicated
by an arrow because CN01
is a connector with lock.
-
→ → → → → Resistance between
opened
phases should be approx.
55 to 77Ω
→ → → → → Should be 10MΩ or
more.
Plug of
soldering
iron
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