Midea MH-SU65-RN8L

11 MAINTENANCE AND UPKEEP
11.1 Failure information and code
In case the unit runs under abnormal condition, failure protection code will display on both control panel and wired controller,
and the indicator on the wired controller will flash with 1Hz. The display codes are shown in the following table:
Table11-1 65KW and 110KW
No. Code Content Note
1 E0
Main control Model setting error
(Other Model Main control EPROM error)
The capability selection is inconsistent with the actual
model. Power on again after setting correctly
2 E1 Phase sequence error of main control board check Recovered upon failure recovery
Communication failure between master and the HMI or master and salve Recovered upon failure recovery
2E2:Communication failure between main board and slave board Recovered upon failure recovery
4 E3 Total water outlet temperature sensor failure (main unit valid) Recovered upon failure recovery
5 E4 Unit water outlet temperature sensor failure Recovered upon failure recovery
1E5 condenser tube temperature sensor T3A failure Recovered upon failure recovery
2E5 condenser tube temperature sensor T3B failure Recovered upon failure recovery
7 E6 Water tank temperature sensor T5 failure Recovered upon failure recovery
8 E7 Ambient temperature sensor failure Recovered upon failure recovery
9 E8 Power supply phase sequence protector output error Recovered upon failure recovery
10 E9 Water flow detection failure
Failure locking for 3 times in 60 minutes(Recovered by
power off or Wired controller clear fault)
1Eb-->Taf1 the pipe of the tank antifreeze protection sensor failure Recovered upon failure recovery
2Eb-->Taf2 cooling evaporator low-temperature
antifreeze protection sensor failure
Recovered upon failure recovery
12 EC Slave unit module reduction Recovered upon failure recovery
13 Ed system discharge temperature sensor failure Recovered upon failure recovery
1EE EVI plate heat exchanger refrigerant temperature T6A sensor failure Recovered upon failure recovery
2EE EVI plate heat exchanger refrigerant temperature T6B sensor failure Recovered upon failure recovery
15 EF Unit water return temperature sensor failure Recovered upon failure recovery
16 EP Discharge sensor failure alarm Recovered upon failure recovery
17 EU Tz sensor failure Recovered upon failure recovery
P0 System high-pressure protection or discharge temperature
protection
for 3 times in 60 minutes
(Recovered by power off)
1P0 Compressor module 1 high pressure protection Recovered upon failure recovery
2P0 Compressor module 2 high pressure protection Recovered upon failure recovery
19 P1
System low pressure protection
（
or Severe refrigerant leakage protection
）
for 3 times in 60 minutes
(Recovered by power off)
20 P3 T4 ambient temperature too high in cooling mode Recovered upon failure recovery
1P4 System A current protection
2P4 System A DC bus current protection
1P5 System B current protection
2P5 System B DC bus current protection
23 P6 Inverter module failure Recovered upon error recovery
24 P7 High temperature protection of system condenser
for 3 times in 60 minutes
(Recovered by power off)
25 P9 Water inlet and outlet temperature difference protection Recovered upon failure recovery
26 PA Abnormal water inlet and outlet temperature difference protection Recovered upon failure recovery
27 Pb Winter antifreeze protection Reminder code, non fault or protection
Recovered upon error recovery
for 3 times in 60 minutes(Recovered by power off)
Recovered upon error recovery
for 3 times in 60 minutes(Recovered by power off)
30 PH Heating T4 too high temperature protection Recovered upon error recovery
31 PL Tfin module temperature too high protection for 3 times in 100 minutes(Recovered by power off)
1PU DC fan A module protection Recovered upon failure recovery
2PU DC fan B module protection Recovered upon failure recovery
1bH:Module 1 relay blocking or 908 chip self-check failed Recovered upon error recovery
2bH:Module 2 relay blocking or 908 chip self-check failed Recovered upon error recovery
34 H5 Voltage too high or too low Recovered upon error recovery
1H9 Compressor A inverter module is not matched Recovered upon error recovery
2H9 Compressor B inverter module is not matched Recovered upon error recovery
36 HC
High pressure sensor failure Recovered upon error recovery
1HE No inset A valve error Recovered upon error recovery
2HE No inset B valve error Recovered upon error recovery
3HE No inset C valve error Recovered upon error recovery
1F0 IPM module A transmission error Recovered upon error recovery
2F0 IPM module B transmission error Recovered upon error recovery
39 F2 Superheat insufficient Wait at least 20min before recovering
Cooling evaporator pressure too low
3 E2
6 E5
28 PC
for 3 times in 60 minutes
(Recovered by power off)
for 3 times in 60 minutes
(Recovered by power off)
33 bH
14 EE
18 P0
21 P4
32 PU
22
29 PE Cooling evaporator low temperature antifreeze protection
xH9
11 Eb
P5
HE
F0
35
37
38
29