There can be several reasons why an air conditioner (AC) may turn off by itself even though it has been running for hours without stopping. Here are a few possible explanations:
Thermostat Settings: The thermostat may be set to a specific temperature, and once that temperature is reached, the AC will automatically shut off. Check the thermostat settings to ensure it is not set to a temperature that has already been reached.
Temperature Fluctuations: If the AC is cycling on and off rapidly, it could be due to temperature fluctuations in the room. When the AC cools the room to the set temperature, it may turn off momentarily until the temperature rises slightly and triggers the AC to turn back on. This is a normal operation known as cycling.
Overheating: An AC unit has built-in safety measures to prevent overheating. If the internal components of the AC get too hot, it may automatically shut off as a safety precaution. This can be caused by a dirty air filter, blocked vents, or a malfunctioning component. Regular maintenance and cleaning can help prevent overheating.
Power Issues: Electrical problems or power surges can cause the AC to shut off unexpectedly. Check the circuit breaker or fuse box to ensure that the AC unit is receiving a consistent power supply. Faulty wiring or connections can also lead to intermittent power supply issues.
Faulty Components: There could be a malfunctioning component within the AC unit itself. For example, a faulty thermostat, a defective sensor, or a malfunctioning compressor may cause the AC to turn off unexpectedly. In such cases, it's best to contact a professional HVAC technician to diagnose and repair the issue.
If your AC continues to turn off by itself or if you suspect a more serious underlying problem, it's recommended to consult a qualified HVAC technician who can assess the situation and provide appropriate solutions.