Hitachi RAM-130QH5, Service Manual, Page: 71 / 84

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Check the light status of LD304
Inspection method 4
LD304 : Blink 1 time
Check C1/D1 or
C4/D4 voltage
OK=DC32 to 37V
Replace
MAIN P.W.B.
OK
NG no
yes
Communication error of
Indoor #1 or Indoor #4
Replace
POWER P.W.B.
Replace
POWER P.W.B.
Replace
MAIN P.W.B.
Restart operation and
check the diagnosis
status again.
If same error cord
occure,
check the Indoor unit.
or
Replace both
POWER and
MAIN P.W.B
Replace
POWER P.W.B.
Replace
MAIN P.W.B.
Check C2/D2 or
C5/D5 voltage
OK=DC32 to 37V
Check C3/D3 or
C6/D6 voltage
OK=DC32 to 37V
Check C1/D1 or
C4/D4 connection
Correct C1/D1 or
C4/D4 connedtion
OK
NG
OK
NG
OK
NG
OK
NG
OK
NG
Check C2/D2 or
C5/D5 connection
Check C3/D3 or
C6/D6 connection
Correct C3/D3 or
C6/D6 connection
Correct C3/D3 or
C5/D5 connedtion
LD304 : Blink 2 times
no
yes
Communication error of
Indoor #2 or Indoor #5
LD304 : Blink 3 times
note:
If Indoor unit is not installed, the correspond error cord will be generated.
Blinking of the LD304 has a priority from the smaller number of times.
In case of some indoors are failed at same time, the LD304 shows the smallest blinking time first.
After the first failure repaired, LD304 shows the next fail.
yes
Communication error of
Indoor #3 or Indoor #6