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6.
Troubleshooting
POSSIBLE CAUSE
SOLUTI
A
The compressor does not start and does not hum
x
Absence of voltage. Starter relay with contacts
open.
x
Check the line or replace the relay.
x
The thermal protector intervenes.
x
Check the electrical connections.
x
Loose electrical connections or incorrect
electrical connections.
x
Tighten the connections or re-perform the
connections according to the wiring diagram.
x
Check inverter compressor
x
Check the
power
and
communication cables
x
Check for the presence
of
alarms
on the compressor
t l
t
i
t l
B
Compressor does not start (emits hum)
x
Incorrect electrical connections.
x
Check the connections.
x
Low voltage on the compressor.
x
Identify the cause and eliminate it.
x
Incorrect rotation of the
compressor.
x
Check the phase sequence
x
Check the compressor-inverter wiring
x
Check the inverter.
x
Check the power cables between the inverter
and compressor and communication cables
x
Check for the presence
of
alarms
on the compressor
x
Replace compressor
C
Inverter alarm intervention
x
Low voltage to the compressor (unbalanced
phases on three-phase motors).
x
Identify the cause and eliminate it.
x
Check its characteristics and replace it if
necessary.
x
Alarms presence.
x
Check compressor rotation
x
Check compressor working conditions
x
Check the alarm type to identify and eliminate
the cause
x
Replace compressor
D
Compressor starts and runs, with short-lasting operating cycles
x
High pressure switch intervention.
x
Check that
the
fan-motor
is
x
Check the correct operation of the HPV valve.
x
Low pressure protection intervention.
x
Check and repair any refrigerant leaks. Then
reload the refrigerant.
x
Verify correct operation of the expansion valves.
Replace the component if necessary.
x
Check and correct user control parameters.
x
Insufficient gas load. Add refrigerant
x
Inverter alarm intervention.
x
Verify the
type
of
alarms identifying and
eliminating
the causes.
x
Replace the compressors
E
Compressor emits loud noise
x
Incorrect rotation.
x
Incorrect rotation. Check the electrical
connection.
x
Insufficient oil.
x
Add oil to the intake of the individual
compressor, attempting to restart.
x
Replace the compressor.
