85
BluCube Installation and Maintenance Manual 7222094 V1.12.0_04_2016
Troubleshooting
FAULT
POSSIBLE CAUSE
REMEDY / ACTION
Compressor short cycles or LP cut-
out operated
LP switch faulty (if fitted).
Check cut out pressure and replace
if necessary.
Dirty indoor unit filters.
Replace.
Dirty or icing evaporator (reduced
airflow).
Defrost and/or clean. Check gas
charge and expansion valve.
Lack of refrigerant (bubbles in sight
glass only as indication).
Check for leaks - repair and recharge
system.
Clogged filter drier (pressure/
temperature drop across it).
Replace.
Condenser fan running at full speed
in winter (full airflow).
Check fan speed controller setting - if
faulty replace.
Start up problems in very low
ambients or when long pipe runs are
experienced.
Check for low suction pressures on
start-up and fit a low ambient start
kit if required, or check operation of
system if already fitted.
Suction Pressure too low
Low evaporator airflow.
Check fan motors, belts and drives.
Flash gas (bubbles in sight glass) at
expansion valve.
Investigate for refrigerant leaks,
repair and re-charge system.
Clogged filter drier (pressure /
temperature drop across it).
Replace.
Obstruction in liquid line solenoid
valve.
Inspect, clean or replace.
Obstruction in expansion valve.
Inspect, clean or replace.
Defrost cycle not initiating
Unit set for cooling only.
Check links.
Check unit configuration / defrost
settings
Condensing Unit
BluCube™
Te
ch
nic
al
