SYMPTOMS AND
TROUBLES
POSSIBLE CAUSES SOLUTIONS
REMARKS
Capacity Control
malfunction
Air-leak or clogging in plumbing system
Cleaning and refastening of Plumbing Equipments
Cap seal damaged Replace
Suction Throttle Valve’s O-ring damaged or deformed
Replace
Inappropriate pressure setting Readjust
Lubricant
deterioration
too early
Use of other than genuine synthetic oil
(NEW
SCREW
OIL NEXT)
Replace it with genuine synthetic oil (blinking
inside is required.)
Ambient Air Temperature too high
Reduce an atmospheric temperature by im-
proving a room ventilation.
Water in the system
Check of Suction Port and Drain the condensate
Deteriorated Lubricant still left Flushing at Lubricant change
Abnormal noise
from air end
Compressor grips Foreign Particle Disassemble/Repair
Inappropriate friction or damage of Bearing
Replace
Other unfamiliar
noises
Loose Bolts or Screws Refastening
Fault Installation
Add some mortar to settle the foundation levelly
Abnormal noise from gears
Foreign matter caught and/or oil deteriorated
Replace the parts.
Excessive Vibration
Loose Bolts or Screws Refastening
Fault Installation
Add some mortar to settle the foundation levelly
Unbalance of the unit due to Cooling
Fan contamination
Clean Fins
* Only if you installed an ammeter on the power supply.
WARNING
1． Running the unit with deteriorated lubricant unchanged or in a very hot condition brings the lubricant
ignites and this may cause serious accident.
Keep the lubricant well controlled (
See p. 20 - 21).
2．Do not operate the unit without protective equipment. In case of SHUTDOWN, read this section “5.
TROUBLESHOOTING” to remove the cause. If the cause is unknown, inform and ask your dealer or
Hitachi regional office.
CAUTION
If the unit stops due to the function of Temperature Relay, check leakage in the mechanical seal and
replace it if lubricant leak is found there.
28
5. TROUBLESHOOTING [A List of SHUTDOWNS Not Displayed on Instrument Panel]
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