Hitachi RAM-130QH5, Service Manual, Page: 65 / 84

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INSPECTING OUTDOOR ELECTRICAL PARTS
LED number
Name Diagnosis
lamp 1
Diagnosis
lamp 2
Operation
lamp
Communications
lamp
Off Off Off Off
Off Off Off
Off Off Off
Off Blinks (blinks) Off
(blinks once)
Off Off On
On
On
On
Off
Off
Off
Off Off
Case 1
Case 2 Blinks once
Blinks
Blinks On
On
On On Off
Off
Off
Off Normal operation
Communications error
Thermistor abnormally
Abnormally stop
Normal off status or
unconnected
microcomputer power
source
Microcomputer reset
status (immediately
after inserting power
source or immediately
after power source
abnormally)
OVL1 operation
OVL2 operation
OVL3 operation
Normal operation
Normal operation
Normal operation
Normal operation
On
Case 3
Case 4
Case 5
Case 6
Case 7
Case 8
Case 9
LD301 LD302 LD303 LD304 Status Checkpoints
If the LED is not on even when the
power source is connected the
microcomputer power source is
unconnected.
Inspection method 1
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
*In the case that an internal unit is
Communications error is shown
by the number of times the LED
blinks.
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.
Inspection method 4
If 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.
Check to see that the LED is either on or blinking outdoor electrical unit 1 and electrical unit 2.
Carry out inspections by examining the on/blinking status of LEDs 301-304.
‚O E E E E E‚`
LD304 LD303 LD302 LD301