When an air conditioner (AC) stops working suddenly while the current drawn by the device remains constant, there could be several potential reasons for this issue. Here are some common explanations:
Frozen Evaporator Coil: If the AC's evaporator coil becomes frozen, it can obstruct the airflow, leading to reduced cooling performance or a complete shutdown. This can happen due to various reasons such as a clogged air filter, low refrigerant levels, or a malfunctioning blower fan.
Thermostat Issues: A faulty thermostat can misread the temperature in the room, leading the AC to shut off prematurely or not turn on at all. It might cause the unit to behave erratically.
Compressor Problems: The compressor is a critical component responsible for cooling the air. If the compressor is faulty or overheats, it may shut down the AC as a safety measure. This can be caused by issues with the capacitor, start relay, or motor.
Electrical Problems: While the current drawn may seem consistent, there could be voltage fluctuations or issues with the electrical supply that affect the AC's operation. These problems may not be apparent in the current reading, but they can impact the AC's performance.
Circuit Protection: Modern air conditioners have built-in circuit protection to prevent damage due to power surges or other electrical issues. If a fault is detected, the AC may shut down automatically to safeguard itself.
Thermal Overload: If the AC unit is operating in extremely hot ambient conditions or its own components are overheating, a thermal overload protection mechanism may trigger a shutdown.
Blocked Airflow: Obstructions in the AC's ductwork or air vents can restrict the airflow, causing the AC to shut down to prevent damage.
Refrigerant Leak: Low refrigerant levels can cause the AC to stop cooling effectively, leading to a possible shutdown. Refrigerant leaks should be addressed promptly by a professional technician.
Dirty Condenser Coils: If the condenser coils are covered in dirt or debris, it can reduce the AC's efficiency and cause it to shut down unexpectedly.
To diagnose and fix the issue, it's best to have a professional HVAC technician inspect and troubleshoot the air conditioner. They have the expertise and tools to identify the specific problem and perform the necessary repairs or maintenance to get the AC working correctly again. Regular maintenance of the AC system can also help prevent sudden breakdowns and ensure optimal performance.