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U-Match Series DC Inverter Service Manual 69 MAINTENANCE
U-Match Series DC Inverter Service Manual 70 MAINTENANCE 1 TROUBLE TABLE 1.1 Main Control Malfunction Table 1 Fault Display on Indoor Wired Controller No. Error code Malfunction name Origin of malfunction signal Control description 1 E1 High pressure protection High pressure switch When outdoor unit detects the high pressure switch is cut off for 3s successively, high pressure protection will occur. All the loads (except the 4-way valve in heating mode) will be switched off. In this case, all the buttons and remote control signals except ON/OFF button will be disabled and cannot be recovered automatically. Switch off the unit or re-energize the unit after cutting off power to eliminate this protection. 2 E2 Freeze protection Indoor evaporator temperature sensor If detecting that the evaporator temperature is lower than protective temp. value after the unit has been running for a period of time under cooling or dry mode, the unit will report this fault, in which case the compressor and outdoor fan motor will be stopped. The unit will not run until evaporator temperature is higher than the protective temp. value and the compressor is stopped for 3min. 3 E3 Low pressure protection Low pressure switch If it is detected within 30s successively that the low-pressure switch is cut off under ON or standby state, the unit will report low pressure protection. If the fault occurs successively 3 times within 30min, the unit cannot be recovered automatically. Refrigerant lacking protection If the unit reports system refrigerant lacking within 10min after turning on the unit, the unit will stop operation. If the fault occurs successively 3 times, the unit cannot be recovered automatically. Refrigerant recycling mode If enter refrigerant recycling mode through special operation, E3 will be displayed. After exiting refrigerant recycling mode, the code will disappear. 4 E4 Compressor high discharge temperature protection Compressor discharge temperature is high If outdoor unit detects that the discharge temperature is higher than protective temp. value, the unit will report high discharge temperature protection. If the protection occurs over 6 times, the unit cannot be recovered automatically. Switch off the unit or re-energize the unit after cutting off power to eliminate this protection. 6 E6 Communicati on malfunction Communicati on between indoor and outdoor mainboard If the outdoor unit does not receive data from indoor unit, communication malfunction will be reported. If there is communication abnormity between display board and indoor unit, communication malfunction will be reported too. 8 E8 Malfunction of indoor fan motor Indoor fan motor If the indoor unit does not receive signal from indoor fan motor for 30s successively when the fan motor is operating, indoor fan motor malfunction will be reported. In this case, the unit can automatically resume operation after stopping. If the malfunction occurs 6 times within one hour, the unit cannot be recovered automatically. Switch off the unit or re-energize the unit after cutting off power to eliminate this malfunction.