M thermal Split
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202004
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2.4 Digital Display Output
Table 4-2.9: Digital display output in different operating states
Split system state
Parameters displayed on outdoor
unit main PCB DSP1
Parameters displayed on hydronic
box main PCB DSP1
On standby
0
0
Normal operation
Running speed of the compressor in
rotations per second
Leaving water temperature (°C)
Error or protection
Error or protection code
Error or protection code
2.5 DIP switch setting and Modbus function
(Modbus function will be available in 2020-5-30)
The rotating coded switch S3(0-F) on the main control board of hydraulic module is used for setting the modbus
address. By default the units have this coded switch positioned=0, but this corresponds to the modbus address 16, while
the others positions corresponds the number, e.g. pos=2 is address 2, pos=5 is address 5.
Figure 4-2.10: Rotating switch
Figure 4-2.11: Connection
Note: Wired controller is integrated in the hydronic box.
Figure 4-2.12: Wiring
Input Voltage(A/B)
13.5VAC
Wiring size
0.75mm²
Midea CAC Confidential
M thermal Split
202004
49
3 Error Code Table
Table 4-3.1: Error code table
Error
code
Serial
Number
1
Content
2
Remarks
C7
65
High temperature protection of transducer module
E0
1
Water flow failure(E8 appears for 3 times)
E1
2
Phase sequence error
Only applies to 3-phase models
E2
3
Communication error between the main control board of hydraulic
module and user interface
E3
4
Final outlet water temperature sensor error
Sensor T1
E4
5
Domestic hot water tank temperature sensor error
Sensor T5
E5
6
Air side heat exchanger refrigerant outlet temperature sensor error
Sensor T3
E6
7
Outdoor ambient temperature sensor error
Sensor T4
E7
8
Balance tank upper temperature sensor error
Sensor Tbt1
E8
9
Water flow failure
E9
10
Suction pipe temperature sensor error
Sensor Th
EA
11
Discharge pipe temperature sensor error
Sensor Tp
Eb
12
Solar panel temperature sensor error
Sensor Tsolar
Ec
13
Balance tank nether temperature sensor error
Sensor Tbt2
Ed
14
Water side heat exchanger water inlet temperature sensor error
Sensor Tw_in
EE
15
Hydronic box EEPROM error
F1
116
DC generatrix voltage is too low
H0
39
Communication error between outdoor unit main control chip and
hydronic box main control chip
H1
40
Communication error between outdoor unit main control chip and
inverter driver chip
H2
41
Water side heat exchanger refrigerant outlet (liquid pipe)
temperature sensor error
Sensor T2
H3
42
Water side heat exchanger refrigerant inlet (gas pipe) temperature
sensor error
Sensor T2B
H4
43
P6 appear 3 times in one hour
H5
44
Room temperature sensor error
Sensor Ta
H6,
45
DC fan error
H7
46
Abnormal main circuit voltage
H8
47
Pressure sensor error
H9
48
Circuit 2 water outlet temperature sensor error
Sensor Tw2
HA
49
Water side heat exchanger water outlet temperature sensor error
Sensor Tw_out
Hb
50
PP protection appears three times in a row and Twout<7
℃
HF
54
Invert module EEPROM error
HH
55
DC fan error(H6 appears 10 times in 120min)
HP
57
Low pressure protection for cooling mode
P0
20
Low pressure switch protection
P1
21
High pressure switch protection
P3
23
Compressor current protection
P4
24
Discharge temperature protection
Table continued on next page …
Midea CAC Confidential
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