What to Do if the Compressor of the 【Refrigerated and Frozen Display Cabinet】 Unit Fails to Start?

2025-02-17

If the compressor of the unit of a refrigerated and frozen display cabinet in a supermarket fails to start (or shuts down automatically), it is generally caused by the following factors:

First, check whether the unit is in the normal defrosting stage. Wait until the defrosting operation is completed, and then conduct other diagnoses.
Check if the power supply fuse has blown. If it has, replace the fuse.
Check for wire faults. See if there is a cut or short - circuit in the control circuit and repair it.
Check if the filter on the unit is dirty and blocked. Replace the filter in a timely manner.
Check if the safety protection devices of the unit are operating abnormally. For example, there may be problems with the temperature regulator, high - and low - pressure switches, solenoid valve operation, starting relay, overload relay, or the oil pressure controller may be disconnected. Check each one individually.
Check if the phase - sequence protector is in a protection state. Check whether there are problems with the working voltage and parameter settings of the phase - sequence protector. If the voltage is too high and exceeds the over - voltage protection range of the phase - sequence protector, the compressor may also fail to start.
Check if there is refrigerant leakage. In this case, a low - level alarm will also occur.
Check each suspicious leakage point one by one, including other mechanical components of the unit, such as whether there is leakage at the connection parts of the liquid storage tank, plug screws, valves, etc.
If all operating indicators are normal but the compressor still cannot start, it is possible that there is a fault in the internal components of the compressor. Remove the compressor, open it, and check if the shaft is normal, and if the motor coil is normal, etc.

Doing regular routine inspections and performing proper maintenance can significantly improve the equipment usage efficiency, reduce sudden failures, and lower maintenance costs.

What to Do if the Compressor of the 【Refrigerated and Frozen Display Cabinet】 Unit Fails to Start?1739805834956