Daikin FTKN09NMVJU Service Manual page 107

SiUS041501E
Step 3
Activate power transistor test operation from the indoor unit.
(1) Turn the power on.
(2) Press the center of the TEMP button and the OFF button on the remote controller at the same
(3) Select T with the TEMP
(4) Press the FAN button.
(5) Press the FAN ONLY button to start the power transistor test operation.
(1) If all the LEDs are lit uniformly, the compressor is defective.
(2) If the LEDs are not lit uniformly, check the power module.
(3) If NG in Check No.22, replace the power module.
(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, the
(2) On completion of the inverter analyzer diagnosis, be sure to re-crimp the FASTON terminals.
Service Diagnosis
time.
HEAT PUMP model
Diagnose method (Diagnose according to 6 LEDs lighting status.)
→ Replace the compressor.
→ Refer to Check No.22.
(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.
If there is no solder cracking, replace the PCB.
LEDs blink quicker. (The LEDs look like they are lit.)
Otherwise, the terminals may be burned due to loosening.
or TEMP button.
OFF
button
COOLING ONLY model
Direction of crimp
FASTON terminal
(R21675)
This size is shortened
by the crimp.
(R15292)
Check
96