Haier MRV S II - Page 59

5757
Failure Code
LD indication
on master unit
Indication on
wired controller
(hex)
Failure code
denition
Failure description Remarks
39-2 39-2
Compression ratio
too low protection
In normal operation, compression
ratio ε <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rm the failure.
Once con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rm the failure.
Once conrmation,
un-resumable
43 43
Discharging temp.
sensor Td too low
protection
In normal operation, if Td<CT+10°C
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rm
the failure. After xed frequency
compressor alarms, inverter
compressor will continue to run. If
xed frequency compressor has been
locked for 3 times, the unit will stop
and alarm.
Once con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rm the failure.
Once con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rm the failure.
Once con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.
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