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z 39 z
43
Master discharge temp. sensor alarm in
low frequence
When inverter compressor frequence is lower than
30H
z
,
T
D1
is higher than
110
44
Communication
error between master
unit
MB89F538
and MCU
807
(indoor)
No signal for over 4 minutes
45
Communication error between master
unit
MB89F538
and MCU
807
(indoor)
MB89F538
and
807
central controller
No signal from indoor unit or central controller for over 4
seconds
46
Communication error between master
unit connecting board and inverter PCB
No signal for over 2 minutes
49
Master inverter drive PCB EEPROM
error
EEPROM
data is lost or installed in wrong way.
50
The total capacity of indoor units is too
high
Total capacity of indoor units>outdoor capacity x
135%
51
Outdoor
communication signal
is lost
52
Indoor units is over than 64 sets
53
C
entral control address repeat
Check the address of all indoor units
54
Master unit oil temp. is over
-
low
In running, the temp. of compressor oil is lower than
(
ps+10
for 5 minutes
69
Slave unit is lost
Communication of slave unit error or switched off
70
Shortage of refrigeration
Only show diagnostic code, doesn t stop units
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