CD 30 ÷ 520
43
Temp protection. Query the inner Temp sensor, when
the motor is cool
Compressor stop
by the
low-pressure
protection
Filter jammed before (or after)
electric expansion valve
Low-pressure switch failure
Low suction pressure
Replace filter
If failure confirmed, replace it.
Refer to “low suction pressure” part.
Abnormal noise
cause by
compressor
Compressor liquid pumping caused
by the entrance of liquid refrigerant.
Compressor aging
Adjust the refrigerant volume
Query expansion valve and suction
gas degree of superheat.
Replace compressor
Other abnormal
noise
Panel bolt loosed
Insufficient strength of the
installation foundation.
Fix all components
Refer to “Unit installation ” part
Compressor can’t
start
Current relay open, burning the
fuse.
Open circuit of the control wire
High or low-pressure protection
Contactor wire burn out
Wrong phases sequence
Water system failure
Failure code displayed by the linear
controller.
Replace the invalid components
Query the control system connection
Refer to the parts above about the
failures caused by suction and
discharge pressure
Replace the invalid components
Exchange any two of three phases
with each other.
Query water system
Confirm the type of failure and take
the corresponding measure.
Airside heat
exchanger
over-frosted
Four-ways value or heat-sensitive
resistance failure.
Short cycle of the air flow
Query the system, replace them if
necessary
Query the system; eliminate the
failure causing short cycle.
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