¥ Check to see that the LED is either on or blinking.
¥ LEDs are divided between those for A cycle and those for B cycle. This is determined by either an A or a B appearing in the
circuit code, for example LD301A or LD301B.
¥ Carry out inspections by examining the on/ blinking status of LEDs 301-304.
If the LED is not on even when the
power source is connected, the
microcomputer power source is
unconnected.
→
Inspection method 1
It is normal for LD301 to blink once
after the power source has been
inserted. If the unit stops when it is in
operation and LD301 blinks once, it is
possible that the power source has
been temporarily interrupted by
lightening or for some other reason.
Replace the control PCB if this occurs
frequently.
Abnormally stop is shown by the
number of times the LED blinks.
→
Inspection method 2
Thermistor abnormally is shown by
the number of times the LED blinks.
→
Inspection method 3
Communications error is shown
by the number of times the LED
blinks.
→
Inspection method 4
*
In the case that an internal unit is
not connected, the number of
connected internal units is
shown by the number of times
the LED blinks. This is not a
abnormally. The internal unit
has no communications error
and is able to operate normally.
Normal operation
Normal operation
Normal operation
Normal operation
Normal of f status or
unconnected
microcomputer power
source
Microcomputer reset
status (immediately
after inserting power
source or immediately
after power source
abnormally)
Abnormally
stop
Thermistor abnormally
Communications error
Normal operation
OVL1 operation
OVL2 operation
OVL3 operation
LED number
Name
Case 1
Case 2
Case 3
Case 4
Case 5
Case 6
Case 7
Case 8
Case 9
LD301
Diagnosis
lamp 1
Off
Blinks once
Blinks
On
Off
(blinks once)
Off
On
Off
On
LD302
Diagnosis
lamp 2
Off
Off
Off
Blinks
Off
Off
Off
On
On
LD303
Communications
lamp
Off
Off
Off
Off
Blinks
Off
Off
Off
Off
LD304
Operation
lamp
Off
Off
Off
Off
Off (blinks)
On
On
On
On
Status Checkpoints
C4D4
INDOOR 4
NLC3D3
INDOOR 3
C1D1
INDOOR 1
C2D2
INDOOR 2
COMPRESSOR
SIDE A.
COMPRESSOR
SIDE B.
L
D
3
0
4
A
L
D
3
0
3
A
L
D
3
0
2
A
L
D
3
0
1
A
L
D
3
0
4
B
L
D
3
0
3
B
L
D
3
0
2
B
L
D
3
0
1
B
SERVICE SWITCH
- 324 -
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