Hitachi RAS-E10H2 - Page 85

LD301 blinks 6 times.
The temperature at the OH thermistor rises.
Is the thermistor circuit normal?
Replace parts in the thermistor circuit.
LD301 blinks 5 times.
Overload lower limit cut.
Replace the main P.
W
.B.
Check to see if the refrigerating cycle is defective. Check the indoor unit for clogged heat exchanger or filter
.
Check the outdoor unit for defective shielding.
LD301 blinks 4 times.
Failure of switching.
Is the 15V power supply output normal? (Main P
.W.B. display)
Is the intelligent power module (IPM) normal? (Inverter section)
The intelligent main module may be defective. Replace the main P.W.B.
See “System Power
Module Diagnosis”.
With CN3 and CN4 disconnected, is the 15V
output between
“15V” and
”15-0V” on the main P
.W.B.?
Replace the main P.W
.B.
LD301 blinks 3 times. Abnormal low speed.
Yes
Yes
Ye
s
Ye
s
Ye
s
Ye
s
Yes
No
No
No
No
No No
No
※ ※ ※
※
LD301 blinks 2 times.
Peak current-cut.
Is the intelligent power
module (IPM) normal?
Replace the intelligent power
module (the main
P.
W
.B.).
LD301 blinks 1 time.
Reset stop.
However
, the unit always r
esets and
stops just after power is supplied:
this does not indicate a fault.
Is the reset circuit normal?
Normally
, pin 7 of
CN18 is approx. 5V
.
Replace the main
P.
W
.B.
Make sure again that
connectors are connected
securely
.
Perform final operation
check.
Ye
s
Ye
s
Ye
s
No
No
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