Daikin FTKM-U Series Service Manual page 98

Check
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 power transistor test operation from the indoor unit.
1. Turn the power on.
2. Select FAN operation with MODE button on the remote controller.
3. Press the center of TEMP button and MODE button at the same time.
4. Select T with TEMP up or TEMP down button.
5. Press MODE button to start the power transistor test operation.
 Diagnose method (Diagnose according to 6 LEDs lighting status)
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,
2. On completion of the inverter analyzer diagnosis, be sure to re-crimp the FASTON terminals.
94
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.
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
SiMX042215E
This size is shortened
by the crimp.
(R15292)
Part 6 Service Diagnosis