Daikin 2MXS-W Series Service Manual page 236

Check
Reference:
If the terminals of the compressor are not FASTON terminals (difficult to remove the wire on the
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 the power transistor test operation from the outdoor unit.
Press the forced cooling operation ON/OFF switch for 5 seconds.
(Refer to page 241 for the position.)
 Power transistor test operation starts.
 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, the
2. On completion of the inverter analyzer diagnosis, be sure to re-crimp the FASTON terminals.
230
(1) Remove the terminals from
the compressor.
Compressor
 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.
(2) Connect the terminals to the
terminals of the inverter
analyzer.
Compressor
Be careful not to let the terminals (U,V,W)
touch each other. Otherwise, high voltage
is applied.
Direction of crimp
FASTON terminal
SiUS122226E
Inverter analyzer
(R22731)
This size is shortened
by the crimp.
(R15292)
Part 6 Service Diagnosis