One of the worst things that can happen to you as a business owner or operatorcold roomIt is when your machine stops working. This can lead to product failure, lost revenue, and unhappy customers. Knowing how to troubleshoot common cold room problems can save you time and money in repairs and downtime.
Today we will give you the complete list of cold room malfunctions and troubleshooting.
Cold Room Troubleshooting Lists
Fault
Reason
Troubleshooting
The temperature is not cold enough
1. The cold room door is not closed tightly
2. Ice on the unit cooler or exhaust pipe is too thick
3. Low compressor efficiency
4. Incorrect adjustment of expansion valve or ice blockage
5. Expansion valve dirty or filter dirty
6. There is less refrigerant in the system
7. Oil contamination inside the exhaust pipe
1. Adjust the cold room door gap
2. Defrosting
3. Repair or replace
4. Readjust or replace dehumidifier
5. Disassemble and wash
6. Add refrigerant
7. Flush with nitrogen
The temperature is too cold
1. Thermostat set too low
2. There is no good airflow in the cold room
1. Check and adjust thermostat
2. Check the evaporator for freezing and defrosting
Condenser pressure too high
1. Insufficient cooling air volume
2. Too thick dirt in the condenser affects the heat distribution
3. There is air in the system
4. Too much refrigerant
1. Find the cause and normalize the air volume
2. Clean
3. Release the air
4. Drain excess refrigerant
Condenser pressure too low
1. Insufficient coolant
2. There is a leak in the drain valve
1. Fill in more refrigerant
2. Repair or replace
Suction pressure too high
1. Expansion valve opened too far or temperature sensing package not installed
2. Compressor suction valve leaking
1. Readjust
Suction pressure too low
1. The opening of the expansion valve is too small or clogged
2. There is insufficient refrigerant in the system
3. Refrigerant is dirty and mixed with too much lubricating oil
1. Adjust and remove blockages
2. Fill enough refrigerant
3. Replace the coolant and check the oil return volume of the oil separator
Compressor not working
1. Power outage, low voltage, circuit failure
2. Poor contact of the starter motor
3. Thermostat is faulty
4. Pressure controller is out of control or faulty
1. Check the circuit
4. Repair or replace
Sudden stop during operation
1. Suction pressure too low and low voltage relay closed
2. Exhaust pressure is too high and high voltage relay is closed
3. Motor overheated and thermal relay closed
1. Unclog pipe and refill coolant
2. Check the cooling air volume and press the high pressure reset button
3. Whether the voltage is too low, whether the cooling load is too large
The compressor never stops
1. Control system is faulty or working condition is not good
2. There is a leak in the compressor suction and discharge valve
1. Overhaul the control system, adjust pressure and temperature parameters
Big noise of the compressor
1. The base is loose
2. Liquid impact
3. Wear on compressor parts
1. Fixing
2. Lower the liquid supply valve
3. Replacement
pressure gauge pointer jump
1. There is air in the system
2. The hand is loose
3. The opening of the meter valve is too large
1. Release the air
2. Replacement
3. Download
Expansion valve frozen
High water content in the refrigerant
Replace moisture absorber
Dirty expansion valve
There is dirt in the system
System cleaning, cleaning the expansion valve filter
Abnormal noise coming from expansion valve
2. The liquid is not subcooled and the resistance of the liquid pipe is too large
1. Reinforcement
2. Find out why the liquid has sufficient subcooling
Expansion valve not working
1. Refrigerant leak in temperature sensing package
2. Orifice and inlet clogging
1. Repair or replace
Solenoid valve cannot be closed
1. The small hole in the valve body is clogged
2. The spring is defective
1. Cleaning
Solenoid valve leaks
1. There is dirt
2. Sealing ring worn
3. Valve pressure too low
3. Recalibration
coolant leaks
1. Refrigerant pipelines corrode, causing leaks
2. Pipelines and other components wear and tear over time
3. Improper installation may lead to refrigerant leaks
1. Make sure your refrigerant pipelines are properly insulated and free of leaks or damage.
2. Make sure your compressor and evaporator coil are working properly.
3. Make sure your cooling systems are installed correctly.
Below we will specifically explain some typical cold room malfunctions.
Temperature Not Cold Enough
If the temperature in your cold room is not cold enough, it will cause your products to deteriorate or be damaged, which means a big loss for you.
Solution:
1. Check and adjust the thermostat to see if the thermostat is working properly.
2. Check and clean the condenser coils for dust or dirt accumulation. If the coils are clean and the temperature is still not cool enough, you may have a coolant leak.
If the temperature in your cold room is too cold, it may cause the products to freeze or get damaged, wasting both your money and your investment.
2. Check the evaporator coils for frost formation and defrost them. If the coils are thawed and the temperature is still too cold, there may be a problem with the thermostat or refrigerant levels.
Compressor Not Working
If the compressor in your cold room does not work, it may cause the temperature to rise and the products to deteriorate.
1. Check the power supply and make sure the compressor is installed properly.
2. Check and adjust the thermostat. If the power supply and thermostat are working properly, there may be a problem with the compressor.
Condenser Fan Not Working
If the condenser fan in your cold room is not working, it may cause the compressor to overheat and become damaged. Finally, your cold room cannot operate normally.
1. Check the power supply and make sure the fan is installed properly.
2. Check for any obstructions around the fan and remove them. If the power supply and fan are working properly, there may be a problem with the motor.
Excessive Condensation
If you have excessive condensation in your cold room, this can cause increased humidity, slippery floors, and increased energy costs.
1. Check for leaks in the Cold Room and repair them.
2. Check the door seal for damage and replace it. If there are no leaks and the seal is in good condition, there may be a problem with the humidity level in the room and you should have a Dehumidifier installed.
Frost Formation on Evaporator Coil
Frost formation on the evaporator coil in your cold room can cause reduced cooling efficiency, reduced airflow, and ultimately equipment damage.
Solution: Check the defrost system and make sure it is working properly. If the defrost system is working properly, there may be a problem with the thermostat or refrigerant levels.
Defective Thermostat
A malfunction of the thermostat in your cold room may cause the room not to cool enough or to become too cold.
Solution: Check the thermostat settings and make sure they are set correctly. If the thermostat is faulty, it should be replaced.
Damaged Door Gasket
a damaged one Cold Room Door The gasket may allow warm air to enter the cold room, causing the room not to cool properly.
Solution: Inspect the door seal for any signs of damage. If damaged, replace it.
Poor Heat Dissipation
Possibly the fan is not turned on, or the fan motor is faulty, or the ambient temperature is high (>40°C), or the condenser fins are clogged with oil and dust, causing air to not circulate.
1. Turn on the fan or replace the faulty fan motor.
2. Use a wire brush to remove dust from the surface or wash the fan motor.
Insufficient Coolant
If the amount of refrigerant in your cold room is low, this may cause the room not to cool normally and eventually cause the stored products to deteriorate.
Solution: Check refrigerant levels and add more if necessary. However, if there is a refrigerant leak, you should repair it before adding more refrigerant.
Defective Compressor
If the compressor in your cold room is not working properly, it may cause the room not to cool properly or not at all.
Solution: Check the compressor for any signs of damage or wear and replace it if damaged.
Inadequate Ventilation
If your cold room does not have adequate ventilation, this can lead to poor temperature control, increased energy costs and increased room humidity.
Solution: Check the ventilation system and make sure it is working normally. You may need to install additional ventilation if necessary.
Insufficient Airflow
Poor airflow can result in uneven temperature distribution throughout the cold room, Increased energy costs, and Reduced storage capacity.
1. Ensure proper air circulation
Make sure the cold room is properly designed for air circulation. This may include installing fans or adjusting the placement of products to improve airflow.
2. Check ventilation systems
Make sure the ventilation system is working properly and is not blocked by dirt or other objects.
3. Clean air filters
Dirty air filters can restrict airflow and reduce the efficiency of the cooling system. Clean or replace air filters regularly when necessary.
4. Install air curtains
Install air curtains at the cold room entrance to prevent warm air from entering and disrupting air flow.
Electrical Problem
Electrical problems can cause your cold room to not cool normally or not work at all.
Solution: Check the electrical connections and make sure they are secure. If there is a faulty connection you need to repair it.
Ice Formation
If ice accumulates in your cold room, it can reduce the efficiency of the cooling system and cause temperature fluctuations in the cold room. This may cause product malfunction and potential safety issues.
Meanwhile, available storage space for products will decrease and the risk of equipment damage will increase.
1. Make sure your evaporator coil is not dirty or clogged, otherwise it may cause ice buildup.
2. Check your defrost system to make sure it is working properly.
3. Make sure your door seal is properly sealed to prevent warm air from getting in and causing condensation, which can freeze and form ice.
Lights Not On
Navigating a cold room can be difficult without adequate lighting, increasing the risk of accidents and injuries.
Meanwhile, certain products can be difficult to find, leading to lost time and lost revenue.
1. Check whether the switch is faulty and the bulb is damaged.
2. The power supply should be cut off during inspection, and you should pay attention to the waterproofness of the lamp when installing the lampshade.
Dirty Evaporator.
Dirty coils can cause your cold room to not cool properly. When dirt and debris accumulate on the coils, it creates a barrier that prevents proper heat transfer.
Solution: Clean the coils regularly. You can use a soft brush or vacuum cleaner to remove any dirt or debris.
Unstable Temperature
Conclusions regarding unstable temperatures:
1. Reduce product quality
Fluctuating temperatures can cause food spoilage, shorten the shelf life of products, and negatively affect product quality.
2. Reduce energy costs.
If the cold room cannot maintain a consistent temperature, the compressor will have to work harder, resulting in increased energy costs.
3. Health and safety concerns
Unstable temperatures can lead to the growth of harmful bacteria, which can pose a health and safety concern for consumers.
4. Increase maintenance costs
Excessive fluctuation of temperature in the cold room can further stress the cooling system, which may lead to increased maintenance costs.
1. Make sure your temperature control settings are set correctly and your thermostat is working properly.
2. Make sure your cold room is properly insulated and there are no air leaks or drafts that could affect the temperature.
Strange Noise
If your cold room is making strange noises, this may indicate a problem with the cooling system or other components.
1. Make sure your compressor is working properly and not making any unusual noises.
2. Check your fans and motors to make sure they are working properly and not causing unusual noises.
Water leak
Water leaks in the cold room can occur for a variety of reasons, including damaged pipes, clogged drain lines, or a faulty defrost system.
Water leaks can lead to serious consequences such as mold growth, structural damage and safety hazards.
1. Make sure your drain line is not clogged or clogged; This may cause water to back up and overflow.
2. Check your door gasket to ensure the seal is proper and prevents condensation from forming.
Coolant Leaks
Causes of coolant leak:
1. Corrosion
Over time, refrigerant pipelines can corrode, causing leaks. Corrosion can result from exposure to moisture or chemicals and can cause metal pipes to fail.
2. Wear and tear
Refrigerant pipelines and other components of the cooling system can experience wear and tear over time, resulting in cracks and leaks.
3. Incorrect installation
If the cooling system is not installed correctly, it may cause leaks in the refrigerant pipelines or connections.
1. Make sure your refrigerant pipelines are properly insulated and there are no leaks or damage.
2. Check your compressor and evaporator coil to make sure they are working properly and not causing any refrigerant leaks.
Solution
Remember that if you are experiencing problems with your cold room, it is always best to consult a professional technician to ensure the problem is properly diagnosed and resolved.
With proper care and maintenance, your cold room can provide reliable and efficient cooling for years to come.