SiSG121917E
Check
Part 6 Service Diagnosis
174
Caution
Reference:
If the terminals of the compressor are not FASTON terminals (difficult to remove the wire on the
terminals), it is possible to connect wires available on site to the outdoor unit from output side of
PCB. (Do not connect them to the compressor at the same time, otherwise it may result in
incorrect detection.)
Step 3
Activate the power transistor test operation from the outdoor unit.
Press the forced operation ON/OFF switch for 5 seconds.
(Refer to page 183 for the position.)
Power transistor test operation starts.
Diagnose method (Diagnose according to 6 LEDs lighting status)
1. If all the LEDs are lit uniformly, the compressor is defective.
Replace the compressor.
2. If the LEDs are not lit uniformly, check the power module.
Refer to
Check No.22
.
3. If NG in
Check No.22
, replace the power module.
(Replace the main PCB. The power module is united with the main PCB.)
If OK in
Check No.22
, check if there is any solder cracking on the PCB.
4. If any solder cracking is found, replace the PCB or repair the soldered section.
If there is no solder cracking, replace the PCB.
1. When the output frequency is low, the LEDs blink slowly. As the output frequency increases,
the LEDs blink quicker. (The LEDs look like they are lit.)
2. On completion of the inverter analyzer diagnosis, be sure to re-crimp the FASTON terminals.
Otherwise, the terminals may be burned due to loosening.
(R22731)
(1) Remo
v
e the terminals from
the compressor.
(2) Connect the terminals to the
terminals of the in
v
erter analyzer.
Be caref
u
l not to let the terminals (U,V,
W
) to
u
ch
each other. Other
w
ise, high
v
oltage is applied.
compressor
compressor
In
v
erter analyzer
(R15292)
Direction of crimp
This size is shortened
b
y the crimp.
FASTO
N
terminal
