48
Failure code
LED
indication
on master
unit
Indication
on wired
controller
(hex)
Failure code
definition
Failure description
Remarks
37-1
25
Lack of phase
of 3N power
supply or
wrong phase
sequence
S phase lack
Once
confirmed,
un-
resumable
37-2
T phase lack
37-3
S phase & T phase normal, but phase
sequency wrong
37-4
Wrong voltage frequency. check BM3-4
setting
38
26
High pressure
sensor Pd too
low protection
Not applicable for this mode
Once
confirmed,
un-
resumable
39-0
27
Low pressure
sensor Ps too
low protection
After compressor is running(except
for residual operation), if in cooling,
Ps<0.10MPa; in heating, Ps< 0.05MPa, in
oil return, Ps<0.03MPa for continuous 5
minutes, stop and alarm. 170 seconds later,
resume automatically. If it occurs 3 times in
an hour, confirm the failure.
Once
confirmed,
un-
resumable
39-1
27
Compressor
ratio ε too high
protection
After compressor is running, compression
ratio ε
＞
8.0 for continuous 5 minute, then
stop and alarm. If in cooling, compression
ratio ε
＞
9.0 for continuous 1 minute or
in heating, compression ratio ε
＞
8.5 for
continuous 1 minute or in heating, stop
and alarm. 170 seconds later, resume
automatically. If it occurs 4 times in an hour,
confirm the failure.
39-2
27
Compressor
ratio ε too low
protection
In normal operation (exclude start up,
defrosting, oil return, remain, stop), if
compression ratio ε<1.8 for continuous 5
minutes, then stop and alarm. Or ε<1.5 for
continuous 1 minute, then stop and alarm.
170 seconds later, resume automatically.
If it occurs 4 times in an hour, confirm the
failure.
40
28
High pressure
sensor Pd too
high protection
After compressor is running, if continuous
2 sec Pd≥4.15MPa, stop and alarm.170
seconds later, resume automatically. If
it occurs 4 times in an hour, confirm the
failure.
(
Like high pressure switch alarm
)
Once
confirmed,
un-
resumable
