Service Manual

Check SiUS041638E
97 Service Diagnosis
Step 3
Activate power transistor test operation from the indoor unit.
(1) Turn the power on.
(2) Select FAN operation with the Mode button on the remote controller.
(3) Press the center of the Temp button and the Mode button at the same time.
(4) Select
T
with the Temp

or Temp

button.
(5) Press the Mode button to start the power transistor test operation.

Diagnose method (Diagnose according to 6 LEDs lighting status of inverter analyzer.)
(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.
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 the inverter analyzer diagnosis, be sure to re-crimp the FASTON terminals.
Otherwise, the terminals may be burned due to loosening.
(R24537)
(R15292)
Direction of crimp
FASTON terminal
This size is shortened
by the crimp.