MCAC-HTSM-201906 Midea R410A Direct Heating Type HPWH 50Hz Technical Manual
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4.2 Error code list
Normal display contents:
1. Under standby and no error and protection situation, the main unit will display the detected water tank
sensor temperature (T5), the slave unit will display the address of this unit.
2. Under the main unit with T5 situation, display T5 temperature; if without T5 or T5 sensor is error, the unit
will display error; the slave unit will display the detected water inlet temperature (T1).
In case the unit runs under abnormal condition, failure protection code will display on both digital tube on
PCB board and wired controller. The indicator on the wired controller will flash with 5Hz. The display codes
are shown in the following table:
Table 3-4.4: Error code list
Power phase sequence error.
Communication error of host unit and wired controller, main unit and slave unit.
Error of water outlet temperature sensor (T1).
Error of water temperature sensor in the water tank (only host unit displays) (T5).
Error of air heat-exchanger temperature sensor (T3).
Error of outdoor ambient temperature sensor (T4)
Error of E-heater pipe temperature sensor (T6, reserved).
Error of circulating water flow detector (Only host unit displays).
Error of suction temperature sensor (Th).
Error of water inlet temperature sensor (T7).
Error of discharge temperature sensor (Tp).
System low pressure protection
System high pressure protection
Compressor current of system is overload (Protection)
Protection for discharge high temperature (Tp≥115ºC)
Host unit is not matched with wired controller, host unit will display P7, and wired
controller will display E2.
Water outlet high temperature protection. (≥68ºC, and keep 2 minutes)
Compressor low current protection.
Remote ON/OFF signal is closed.
Continuous come out any error for 4 times within 2 hours, then the unit will stop running. At the same
time, it will be counted as once. After 1 hour, the unit will be automatically running again.
If the stop frequency reaches 5 times, the protection code will be displayed and the unit should be
repowered on again.
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