Is 220-230V being generated
at terminals A and B?
Are the connections for
terminals C and D correct?
Is 5V being generated between
Pin
ĺ (0V) and Pin
Ĺ
(5V) at
CN 18 (test pin)?
Is the 25A fuse normal?
[No operation or abnormal operation]
Be sure to turn the power off
before correcting the connection.
mainly, varistor (VS2), 3A fuse,
smoothing capacitors, IPM, etc.
The SW power supply's overcurrent protection is
activated, disabling the microcomputer.
Correct properly.
If the 25A fuse has blown,
be aware that other parts
may also be defective.
Replace defective parts.
Is the po
wer circuit normal?
See the description on power
circuit for details.
Is the switching power
circuit OK?
Has the 3A fuse blown?
Check to see if C and D cables are
connected correctly.
If reversed or incompletely inserted,
correct the cable connection.
Replace any defective parts.
If the 3A fuse has blown, the varistor 2, etc.
may also be defective.
With the piping and lines (A,
B,
C, D) connected, operate
the unit in the forced cooling
mode using the outdoor unit
service switch.
How did the self-diagnosis
lamp (LD301) blink?
See the self-diagnosis
lamp mode.
Ye s
Ye s
Power is OK
Ye s
Ye s
Ye s
No
No
No
No
NG
(Fuse blown)
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