Daikin 2MXS40H2V1B Service Manual page 224

Check
(1) When all the LEDs are lit uniformly, the compressor is defective.
(2) When the LEDs are not lit uniformly, check the power module.
(3) If NG in Check No.22, replace the power module (PCB).
(4) If any solder cracking is found, replace the PCB or repair the soldered section.
Caution
(1) When the output frequency is low, the LEDs blink slowly. As the output frequency increases,
(2) On completion of the inverter analyzer diagnosis, be sure to re-crimp the FASTON terminals.
213
ARC452, ARC433 Series
1) Turn the system 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 figure of ten's place blinking.
4) Press the [MODE] button.
→ 00 is displayed with the figure of one's place blinking.
5) Press the [MODE] button.
→ T is displayed.
6) Press the [ON/OFF] button.
→ Power transistor test operation starts.
FFQ models with wired remote controller
1) Turn the system on.
2) Select FAN operation on the remote controller.
3) Press the [ON/OFF] button.
→ FAN operation starts.
4) Press the [TEST] button 4 times.
→ Power transistor test operation starts.
FFQ models with wireless remote controller
1) Turn the system on.
2) Select FAN operation on the remote controller.
3) Press the [ON/OFF] button.
→ FAN operation starts.
4) Press the [TEST] button twice.
→ Power transistor test operation starts.
Diagnose method (Diagnose according to 6 LEDs lighting status.)
→ Replace the compressor.
→ Refer to Check No.22.
If OK in Check No.22, check if there is any solder cracking on the PCB.
If there is no solder cracking, replace the PCB.
the LEDs blink quicker. (The LEDs look like they are lit.)
Otherwise, the terminals may be burned due to loosening.
Direction of crimp
FASTON terminal
SiBE121123_A
This size is shortened
by the crimp.
(R15292)
Service Diagnosis