Hitachi RAS-18FH6 - OUTDOOR UNIT

– 70 –
1/ 2/ IPM (Intelligent Power Module)
3/ Service Switch
4/ Self-Diagnosis Lamp
Remove the compressor connector.
If your first attempt
fails, wait 3 minutes
(for the unit to re-
start) and check the
self-diagnosis lamp
status again.
Check outdoor electrical parts.
Check the refrigerating
cycle.
Normal
No
Ye s
Check the drive
circuit (IPM) using
the PRD checker.
Check the position
sensor circuit.
With the unit set in the operating
state, press the start/stop
button.
Does the unit operate for
approximately 2 seconds (the
LD303 coming on) and then
stop due to a failure of switching
(the lamp blinking 4 times)?
OUTDOOR UNIT
LD303
LD30
2
LD30
1
MAIN
P
.
W
.
B
.
S
E
R
VI
C
E
S
WIT
CH
HI
C
IPM
RAS_AW_063-082e 11/17/06, 11:52 AM70