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Digital tube
Indication
indication
on wired
Failure code
on master
controller
unit
(hex)
Upper DC motor
71-0
47
failure
Lower DC motor
71-1
47
failure
No pressure
75-0
4B
difference
The pressure
75-4
4B
difference is too
small
78
4E
Lack of refrigerant
IPM modular
81
51
temp. too high
protection
Compressor
82
52
current protection
Outdoor model
83
53
setting wrong
Transient over
current in IPM
108
6C
module rectifier
side software
Current of IPM
module rectifier
109
6D
side detection
circuit abnormal
Over current of
110
6E
IPM modular
hardware
Compressor out of
111
6F
control
Radiator of
112
70
module temp. too
high
113
71
Module overload
Voltage too low
114
72
of DC bus line of
module
Voltage too high
115
73
of DC bus line of
module
Communication
abnormal between
116
74
module and
control PCB
Failure description
definition
Running at speed below 20rpm for 40s, or running lower than
70% of target speed for 2 minutes, 3 minutes after recovery, If it
occurs 3 times in an hour, confirm the failure
Within 3 minutes after the compressor starts, if Pd-Ps ≤ [1.0] kg for
continuous 1 minutes, alarm; it will recovery after 3 minutes. If it
occurs 3 times in an hour, confirm the failure
Pd-Ps ≤ [2.0] kg for continuous 5 minutes, alarm; it will recovery
after 3 minutes. If it occurs 3 times in an hour, confirm the failure
Compressor running in cooling mode, Ps≤[2.0]kg for continuous
30 minutes, alarm; Ps≥[3.0]bar for continuous 30min, recovery.
Compressor running in heating mode, Detect the outdoor EEV
open fully for continuous [60] minutes and suction superheat Ts -
Ps ≥ 20°C, alarm;Ps≥[2.0]bar for continuous 30min, recovery.
IPM modular temp.≥[85]°C, alarm; IPM modular temp.≤[65]°C,
recovery. If it occurs 3 times in an hour, confirm the failure
Compressor current exceeds specified value, 3 minutes after
recovery, If it occurs 3 times in an hour, confirm the failure
Model and dip swtich setting do not match
Transient over current in IPM module rectifier side software
Current of IPM module rectifier side detection circuit abnormal
IPM modular over current,
In the course of compressor startup or running, the unit can not
detect the rotor position, stop for 5s and INV control board resume
automatically.
When The temp. ≥ 94°C, alarm
When The temp. < 94°C, INV control board resume automatically.
Module overload
When power supply voltage < DC420V, alarm
When power supply voltage
automatically.
When power supply voltage > DC642V, alarm
When power supply voltage < DC642V, INV control board resume
automatically.
Communication is disconnected
> DC
420V, INV control board resume
44
Remarks
Once
confirmation, un-
resumable
Once
confirmation, un-
resumable
Once
confirmation, un-
resumable
Once
confirmation, un-
resumable
Un-resumable
3 times in an
hour, confirm
failure; once
confirmation, un-
resumable
3 times in an
hour, confirm
failure; once
confirmation, un-
resumable
Resumable
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