Fault Display and Phenomenon:
The mainboard dual 88 indicator lights are “on” and display “E5”. The mainboard indicator lights and remote controller fault display are shown in the figure below.
This fault pertains to Gree D series modular machines, involving the following models:
LSQWRF65M/D, LSQWRF65M/NaD, LSQWRF80M/D, LSQWRF80M/NaD, LSQWRF130M/D,LSQWRF130M/NaD, LSQWRF160M/D, LSQWRF160M/NaD
The current fault page display of the remote controller is as follows: Compressor overload protection.
Compressor Overload Protection includes compressor overload protection in cooling mode and compressor overload protection in heating mode, which will be introduced separately below.
1. Compressor Overload Protection in Cooling Mode
In cooling conditions, if overload protection occurs, judgments can be made from the following aspects:
1. Check if the ambient temperature or water temperature is normal
① Check the local ambient temperature; is the ambient temperature abnormally high?
② Check the inlet and outlet water temperatures; generally, the ambient temperature should not exceed the normal range. Observe the inlet and outlet water temperatures. If the inlet and outlet water temperatures exceed the usage requirements of the manual, please lower the water temperature.
2. Check if the system’s discharge temperature is normal
① Check the unit’s manual controller to see the “discharge temperature”. If the discharge temperature is too high, connect a pressure gauge to the system. If the pressure value in the system corresponds to the saturation temperature and is consistent with the current ambient temperature, the refrigerant in the system is normal; if the pressure value in the system approaches atmospheric pressure or the measured pressure value corresponds to a saturation temperature less than the current ambient temperature by more than 10 degrees, the refrigerant in the system is insufficient. Please check the system for leakage points (note: detection needs to be performed after the unit has been shut down for more than 1 hour);
② Check if the system’s fins are dirty. If the fins are very dirty, please clean them;
③ Observe the discharge temperature on the manual controller. If the discharge temperature is below 55℃, immediately use a multimeter to measure the unit’s current. If it is significantly greater than the current indicated on the nameplate, it indicates that the refrigerant amount in the unit is excessive; (if the compressor is damaged due to liquid impact, it will also be accompanied by abnormal sounds like “clicking”, which is more common when replacing the compressor or when the unit is turned on without heating!).
3. Check if the operating voltage exceeds the usage requirements of the manual
① Use a multimeter to measure the unit’s input voltage. The voltage must not exceed the usage requirements of the manual (±10% of the rated voltage).
2. Compressor Overload Protection in Heating Mode
In heating conditions, if overload protection occurs, judgments can be made from the following aspects:
1. Check if the water temperature and ambient temperature exceed the usage range of the manual;
Check the water temperature; the outlet temperature must not exceed 50℃ as specified in the manual, and the ambient temperature must not exceed 24℃ as specified in the manual.
2. Check if the water pump and water circuit system are normal
① Check if there is water flow in the water pump. Observe if there is a loud vibration sound in the water system, and observe the temperature difference of inlet and outlet water on the manual controller. If it exceeds 8℃, it indicates insufficient water flow;
② Check if there is air in the shell and tube water system. If there is a loud vibration sound in the water system, it indicates that the air has not been completely evacuated. Please continue to open the exhaust valve to evacuate;
③ Check if the water pump is damaged. If damaged, the water pump noise will be very loud. You can also turn on the backup water pump for flow comparison;
④ Check if the water system filter is clogged. If the water flow is small, remove the filter for replacement.
3. Check if the system’s discharge temperature is normal
① Check the unit’s manual controller to see the “discharge temperature”. If the discharge temperature is too high, connect a pressure gauge to the system. If the pressure value in the system corresponds to the saturation temperature and is consistent with the current ambient temperature, the refrigerant in the system is normal; if the pressure value in the system approaches atmospheric pressure or the measured pressure value corresponds to a saturation temperature less than the current ambient temperature by more than 10 degrees, the refrigerant in the system is insufficient. Please check the system for leakage points (note: detection needs to be performed after the unit has been shut down for more than 1 hour);
② Check if the system’s fins are dirty. If the fins are very dirty, please clean them;
③ Observe the discharge temperature on the manual controller. If the discharge temperature is below 55℃, immediately use a multimeter to measure the unit’s current. If it is significantly greater than the current indicated on the nameplate, it indicates that the refrigerant amount in the unit is excessive; (if the compressor is damaged due to liquid impact, it will also be accompanied by abnormal sounds like “clicking”). If it is determined to be a compressor issue, please replace the compressor!
4. Check if the operating voltage exceeds the usage requirements of the manual
Use a multimeter to measure the unit’s input voltage. The voltage must not exceed the usage requirements of the manual (±10% of the rated voltage).
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