Daikin 4MXL-T Series Service Manual page 245

SiUS121827E
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.
Part 6 Service Diagnosis
→ Replace the compressor.
→ Refer to Check No.22.
(Replace the main PCB. The power module (IPM1) 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.
Direction of crimp
FASTON terminal
Check
This size is shortened
by the crimp.
(R15292)
239