27
LD
indication
on master
unit
Indication
on wired
controller
(hex)
Failure code
de
fi
nition
Failure description
Remarks
39-2
39-2
Compression
ratio too low
protection
In normal operation, compression ratio
<1.8 for continuous 5 minutes stop and
alarm.2 minutes and 1 seconds later,
resume automatically, if it occurs 3 times
in an hour, con
fi
rm the failure.
Once
con
fi
rmation,
un-resumable
40
40
High pressure
sensor Pd too
high protection
In normal operation, Pd>=4.15Mpa for
continuous 50ms, alarm and stop. 2
minutes and 50 seconds later, resume
automatically, if it occurs 3 times in an
hour, con
fi
rm the failure.
Once
con
fi
rmation,
un-resumable
43
43
Discharging
temp. sensor
Td too low
protection
In normal operation, if Td<CT+10 for
continuous 5 minutes, the unit stops and
alarms.2 minutes and 50 seconds later,
resume automatically. If it occurs 3 times
in an hour, con
fi
rm the failure. After
fi
xed
frequency compressor alarms, inverter
compressor will continue to run. If
fi
xed
frequency compressor has been locked
for 3 times, the unit will stop and alarm.
Once
con
fi
rmation,
un-resumable
46
46
Communication
with inverter
board failure
No communication within 30 seconds
continuously
Resumable
71
71
DC motor
blocked
Running at speed below 20rpm for 30s,
or at speed of 70% lower than the target
for 2 minutes, 2 minutes and 50 seconds
later after stop, resume automatically. It
occurs 3 times in an hour, con
fi
rm the
failure.
Once
con
fi
rmation,
un-resumable
75
75
No pressure
drop between
high pressure
and low one
In 5 minutes after inverter compressor
starts up, Pd-Ps<=0.2MPa. 2 minutes
and 50 seconds later after unit stops,
resume automatically, if it occurs twice
continuously, con
fi
rm the failure.
Once
con
fi
rmation,
un-resumable
78
78
Lack of
refrigerant
Compressor running in cooling mode,
Ps<0.2MPa for 30 minutes; compressor
running in heating mode, Tsi - ET>20;
LEV will fully open for 60 minutes, the
unit will output lack of refrigerant alarm,
unit will not stop.
--
Failure code
