Midea M-Thermal Series Service Manual page 41

M‐Thermal Split
Table 4‐3.1: Error code table (continued)
H8 47 Pressure sensor error
H9 48 Circuit 2 water outlet temperature sensor error
Water side heat exchanger water outlet
HA 49
temperature sensor error
HF 54 Refrigerant system EEPROM error
P0, 20
Low pressure protection
HP 57
P1 21 High pressure protection
P3 23 Compressor current protection
P4 24 Discharge temperature protection
High temperature difference between water side
P5 25 heat exchanger water inlet and water outlet
temperatures protection
P6 26
Inverter module protection
H4 43
L0 ‐ Inverter module protection
L1 ‐ DC bus low voltage protection
L2 ‐ DC bus high voltage protection
L4 ‐ MCE error
L5 ‐ Zero speed protection
L7 ‐ Phase sequence error
Compressor frequency variation greater than
L8 ‐
15Hz within one second protection
Actual compressor frequency differs from target
L9 ‐
frequency by more than 15Hz protection
Pb 31 Water side heat exchanger anti‐freeze
High temperature protection of refrigerant outlet
Pd 33
temperature of condenser in cooling mode
PP 38 Water side heat exchanger inlet temperature is
Hb 50 higher than outlet temperature in heating mode
Notes:
1. When the error code appears, the error code corresponding to the serial number can be obtained through the H1H2 port by using the host
computer to query the wired controller register.
2. Sensor names in this service manual referring to refrigerant flow is named according refrigerant flow during cooling operation refer to Part 2, 3
"Refrigerant Flow Diagrams".
40
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User interface and outdoor
unit main PCB
User interface and hydronic
box main PCB
User interface and hydronic
box main PCB
User interface
refrigerant system main PCB
User interface
refrigerant system main PCB
User interface
refrigerant system main PCB
User interface and outdoor
unit main PCB
User interface and outdoor
unit main PCB
User interface and hydronic
box main PCB
User interface
Outdoor unit main PCB
Outdoor unit main PCB
Outdoor unit main PCB
Outdoor unit main PCB
Outdoor unit main PCB
Outdoor unit main PCB
Outdoor unit main PCB
Outdoor unit main PCB
Hydronic box main PCB
User interface and outdoor
unit main PCB
User interface and hydronic
box main PCB
Sensor T1B
Sensor Tw_out
and
and
and
Displayed on user interface
when any of L0, L1, L2, L4,
L5, L7, L8 or L9 occur
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