Specifications

SiBE04-624 Check
Service Diagnosis 207
Caution
 When the output frequency is low, the LED flashes slowly. As the frequency increases, the
LED flashes quickly. (It looks like the LED is lit)
 If the operation is carried out with no load (the condition of the compressor is disconnected),
some of units may stop operation with “CT system error” (due to no electric current) or
“startup failure” (because the compressor does not turn). In this case, check if the LED is
flashing during “operation” to “malfunction stop”. (Refer to the service manual of each air
conditioner for checking whether the alarm LEDs for CT system, startup failure, etc. are
provided or not.)
 On completion of diagnose by this checker, be sure to re-crimp the faston terminal for
resetting the system.
(Otherwise, the terminal may be burned due to loosening.)

How to activate the inverter test mode
1) Hold the “CLOCK” button for 5 seconds.
(The matrix display will appear on the remote controller.)
2) Display “ ” on the matrix display of the remote controller and press the “CLOCK”
button.
3) “
T
” will be displayed.
4) Press the “CLEAN / FRESH” button for inverter test mode.
3.9 Power Transistor Check
Check No.15

Do not touch the live parts within 10 min. after the breaker is turned off.

Even after that, when you touch the parts, check to see that supply voltage of the power
transistor is less than 50 V with a tester.

Measure resistance at connector terminal on PCB or at the relay connector.
Direction of crimp
This size is shortened
by “crimp”.
Faston terminal
(R5161)
(–) terminal of a tester
Power transistor
(+)
UVW
Power transistor
(–)
UVW
(+) terminal of a tester UVW
Power transistor
(+)
UVW
Power transistor
(–)
Resistance in OK several kΩ~several MΩ
Resistance in NG 0 or
∞