Hitachi RAS-8FSXN - Page 173

Cause Check Item
Action
(Turn OFF Main Switch)
Phenomenon
Cooling or
Heating
Operation
with
Abnormal
Sound
Outdoor Fan
is Not Operated
When
Compressor
is Operated
Abnormal Sound from
Inside of Compressor
Replace compressor.
Wear or
Breakage of
Internal
Comp. Parts
Check expansion valve
opening.
Check each part is
tightly fixed.
Abnormal
Sound from
Compressor
Faulty
Installation
Tightly fix it.
Ensure superheat.
Liquid Ref.
Compression
Check resistance.
(Crankcase Heater, Fuse)
Replace crankcase
heater or fuse.
No Heating
by Crankcase
Heater
Check it by viewing.
Remove foreign
particles.
Foreign Particles Inside
of Fan Casing
Check it by viewing.
Adjust position of
fan runner.
Indoor Unit Fan Runner
is Hitting Casing
Check it by viewing.
Adjust position of
propeller fan.
Outdoor Unit Propeller Fan
is Hitting Shroud
Check surface of
contacts.
Replace magnetic
switch.
Hamming Sound from
Magnetic Contactor
Check each fixing
screws.
Tightly fix it.
Abnormal Vibration of
Cabinets
Check obstacles. Remove obstacles.Obstacle at Outdoor Fan
Check wiring.
Connect wiring
correctly.
Disconnected Wiring for
Indoor Fan
Check AC chopper. Replace AC chopper.Failure of AC Chopper
Wait for switching of
reversing Valve.
(1 to 3 minutes)
In case that
reversing Valve is not
switched, check for
insufficient refrigerant.
Watching Condition for
Heating Operation
Indoor Fan
is Not Operated
When
Compressor
is Operated
Check operation
pressure.
Add refrigerant.
Discharge Pressure Does
Not Increase Higher than
1.5MPa due to insufficient
refrigerant.
8 Troubleshooting
167
SMGB0065 rev. 1 - 12/2010
8