Buzz
1. Low or Depleted Refrigerant
Refrigerant inside the air conditioner is a non-degradable chemical, so it typically does not deplete during the unit's operation. The occurrence of low or depleted refrigerant results from issues like leaking pipes, valve corrosion, etc., or during a new installation, where technicians fail to check and fill the necessary refrigerant.
To identify if the air conditioner is low on refrigerant, observe the following symptoms:
- Unit not cooling effectively
- Frost on the small tube of the condenser
- Operating current lower than the rated current specified on the unit
- Low suction gas pressure compared to normal (normal range is 65 - 75 psi). High-pressure side pressure is also lower than normal
- In some air conditioners, the control board will automatically shut off after 5 - 10 minutes of operation and display an error on the condenser.
Remedy: Contact the warranty center to inspect the refrigerant pipes and recharge the refrigerant.
2. Air Conditioner Too Cold
Excessive cooling in the air conditioner may be caused by a malfunctioning temperature control unit or the temperature being set too low compared to the usage needs.
How to fix:
- Check the flow of the temperature control unit and wiring
- Adjust the temperature to the appropriate level
In some cases, the air conditioner runs for a while and then shuts off, repeating this cycle continuously. This not only wastes electricity but also affects the user experience. Some reasons for this phenomenon include: Lack or excess of refrigerant causing unstable operation, clogged refrigerant pipes, damaged compressor contactor coil, dirty condenser causing blockage, clogged expansion valve or capillary tube. Alternatively, the sensor of the expansion valve may be faulty. Low voltage may also hinder the proper functioning of the air conditioner.
To address this issue, recharge refrigerant if it is lacking or remove excess refrigerant. Eliminate obstacles in the refrigerant pipe, regularly clean and maintain the air conditioner, including the condenser and vital connecting components. Replace the expansion valve and capillary tube if necessary. Ensure that the air conditioner operates at the correct voltage as specified on the unit. Use a voltage stabilizer if needed.
5. Continuous Operation Without Cooling
Sometimes, you may find that the air conditioner is running continuously but not effectively cooling. Several factors could contribute to this situation, such as: Lack of refrigerant due to leakage or clogged refrigerant pipes, dirty air filters and evaporator coils preventing cold air from being released, dirty condenser coils, insufficient airflow through the evaporator coil, inadequate heat dissipation in the surroundings, inefficient compressor operation, and excessive load causing insufficient power supply for the unit to function.
Errors Related to Pressure
Low Suction Pressure:
- Causes:
- Insufficient refrigerant
- Liquid gas pipe obstructed or blocked
- Dirty air filter and dirty evaporator coil
- Insufficient airflow through the evaporator coil
- Check valve or suction pipe blocked
- Faulty check valve sensor
- Remedies:
- Replace obstructive component
- Check the fan
- Replace valve or suction pipe
High Suction Pressure:
- Causes:
- Excess gas
- Inefficient compressor operation
- Incorrect sensor installation position
- Overload
- Remedies:
- Reduce charged gas amount
- Check compressor efficiency
- Change sensor installation position
- Check load
Low Discharge Pressure:
- Causes:
- Insufficient refrigerant
- Inefficient compressor operation
- Remedies:
- Leak test
- Check compressor efficiency
High Discharge Pressure:
- Causes:
- Air or non-condensable gas in the air conditioner
- Non-circulating heat dissipation air
- High air or water heat dissipation temperature
- Insufficient air or water heat dissipation
- Remedies:
- Reduce charged gas amount
- Maintain the condenser
- Evacuate and recharge with new gas
- Remove obstructions in the heat dissipation airflow
8. Evaporator Fan Not Running
When the evaporator fan fails to run, it disrupts the cooling process inside the unit, leading to ineffective air circulation. A stationary evaporator fan prevents the cold air from being distributed by the fan blades, rendering the air conditioner ineffective.
10. Air Conditioner Not Cooling While Air Still Blows from the Unit
If you feel your air conditioner is not cooling or heating the air, despite air still escaping from the unit, it could be due to the following reasons:
- The temperature setting is higher than the cooling demand
- An enclosed space leading to the loss of cold air outside
- The air filter and evaporator coil are clogged with dust
- The room size exceeds the capacity of the unit
How to troubleshoot:
- Check the temperature setting to ensure it aligns with your cooling needs. Adjust the temperature and cooling mode to achieve the desired cooling effect
- Inspect if the air filter is working efficiently and clean. Performing regular maintenance on the air filter will help the air conditioner operate smoothly and maintain stable cooling
- Check and close the main door, windows, or office doors if open
- Ensure proper airflow by clearing the intake and exhaust pipes both indoors and outdoors. Wait for about 3 minutes and restart the air conditioner for stable airflow and improved air exchange
- The air conditioner may not cool during the 3-minute compressor protection mode, so wait until this mode completes
- Check if the room is using high-heat-emitting devices such as electric stoves or hot water basins, as the emitted heat can affect the cooling efficiency in the room
