Hitachi RAM-71QH5 Service Manual page 67

Yes
LD301: Blinks five times Insert the power source and operate, and
then check to see that the outdoor fan is
Overload stop
rotating
No
The protection circuit may
cause the fan to stop when
the wind is extremely strong
in
outdoor unit is installed or
when the outdoor unit is
covered.
Outdoor fan rotates normally
There is the possibility that the cycle load may have become extremely
heavy. Check the compressor.
Check the electric expansion valve.
Clean the filter.
Check the position of the outdoor unit. If there is a problem, install according
to the recommended conditions.
Yes
LD 301: Blinks six times
The compressor may be too hot. Check to
Overheating stop
see that the coolant is not leaking.
No
Refil the coolant
LD301: Blinks eight times Yes
The compressor does not accelerate.
Acceleration abnormally Check to see that the coolant is not
leaking.
No
Refil the coolant
Yes
LD301: Blinks thirteen times
Replace the MAIN P.W.B..
2
E PROM error
No
LD301: Blinks fourteen times
The SPM2 is broken. Replace the SPM2.
ACT error
Outdoor fan
rotates
Outdoor fan rotates,
but soon stops.
No problems
the place where the
with installation
position
No coolant leak
There is the possibility that the electric expansion valve
may not be working.
Check the voltage between BEN-12V and BEN-OV
Coolant leak
Replace the electric expansion valve.
Normal
Check the compressor.
Coolant leak
Replace the fan motor.
Abnormal
Normal
NO CHANGE
(still same)
Replace MAIN P.W.B..
NO CHANGE
(still same)
Check the compressor.
Replace POWER P.W.B..
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