SiUS041111
Check
Service Diagnosis
121
Step 3
09/12 class: Activate power transistor test operation from indoor unit.
1) Turn the power on.
2) Select FAN operation with the [MODE] button on the remote controller.
3) Press the 3 buttons (TEMP
, TEMP
, MODE) simultaneously.
00
is displayed with the left-side number blinking.
4) Press the [MODE] button.
00
is displayed with the right-side number blinking.
5) Press the [MODE] button.
T
is displayed.
6) Press the [ON/OFF] button.
Power transistor test operation starts.
15/18/24 class: Activate power transistor test operation from the outdoor unit.
1) Press the forced cooling operation ON/OFF button for 5 seconds.
(Refer to page 222 for the position.)
Power transistor test operation starts.
Diagnose method (Diagnose according to 6 LEDs lighting status.)
(1) When all the LEDs are lit uniformly, the compressor is defective.
Replace the compressor.
(2) When the LEDs are not lit uniformly, check the power module.
Refer to Check No.13.
(3) If NG in Check No.13, replace the power module (control PCB).
If OK in Check No.13, check if there is any solder cracking on the filter PCB.
(4) If any solder cracking is found, replace the filter PCB or repair the soldered section.
If the filter PCB is OK, replace the control PCB.
Caution
(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 diagnose by the inverter checker, be sure to re-crimp the FASTON terminals.
Otherwise, the terminals may be burned due to loosening.
(R5161)
Direction of crimp
FASTON terminal
This size is shortened
by “crimp”.
