Hitachi RAM-90QH5, Service Manual, Page: 70 / 83

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Yes
Outdoor fan
rotates
Outdoor fan rotates normally
heavy. Check the compressor.
Check the electric expansion valve.
Clean the filter.
The compressor may be too hot. Check to
see that the refrigerant is not leaking.
to the recommended conditions.
Replace the fan motor.
Outdoor fan rotates,
but soon stops.
No problems
with installation
position
No refrigerant leak Abnormal
Refrigerant leak
Normal
Yes
LD301: Blinks five times
Overload stop
Insert the power source and operate, and
then check to see that the outdoor fan is
rotating
No
No
LD 301: Blinks six times
Overheating stop
The protection circuit may
cause the fan to stop when
the wind is extremely strong
in the place where the
outdoor unit is installed or
when the outdoor unit is
covered.
Refil the coolant
NO CHANGE
(still same)
Replace MAIN P.W.B..
NO CHANGE
(still same)
Check the compressor.
Replace POWER P.W.B..
Replace the electric expansion valve.
There is the possibility that the electric expansion valve
may not be working.
Check the voltage between BEN-12V and BEN-0V,
BEN-12V-A and BEN-0V-A, BEN-12V-B and BEN-0V-B)
There is the possibility that the cycle load may have become extremely
Check the position of the outdoor unit. If there is a problem, install according