Haier MRVIII-S AV08NMSETA Design, Installation & Maintenance Instruction page 75

LD Indication
indication on wired Failure code
on master controller
unit (hex)
Compression
39-2 39-2 ratio too low
protection
High pressure
40 40 sensor Pd too
high protection
Discharging
temp. sensor
43 43
Td too low
protection
Communication
46 46 with inverter
board failure
DC motor
71 71
blocked
No pressure
drop between
75 75
high pressure
and low one
Lack of
78 78
refrigerant
Failure description
defi nition
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, confi rm the failure.
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, confi rm the failure.
In normal operation, if Td<CT+10
continuous 5 minutes, the unit stops and
alarms.2 minutes and 50 seconds later,
resume automatically. If it occurs 3 times
in an hour, confi 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.
No communication within 30 seconds
continuously
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, confi rm the
failure.
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, confi rm the failure.
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.
75
Remarks
Once
confi rmation,
un-resumable
Once
confi rmation,
un-resumable
for
Once
confi rmation,
un-resumable
Resumable
Once
confi rmation,
un-resumable
Once
confi rmation,
un-resumable
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