A/C light blinks 3 times and won't engage or turn on (2024)

FAQs

A/C light blinks 3 times and won't engage or turn on? ›

Low Refrigerant Levels

One of the most common reasons for an air conditioner light blinking is low refrigerant levels. When the refrigerant level is low, it means that the system is not able to cool the air properly. This can be caused by a number of different things, such as a leak in the system, incorrect installation, or simply overuse.

An air conditioning unit may give off a blinking light if it has poor air circulation. Air conditioners, particularly window air conditioners, require adequate air flow to function properly, and a blockage, dust buildup, or debris might be hindering this, prompting the air conditioner to give off a flashing light.

A flashing check engine light usually indicates a severe issue that requires immediate car repair. Issues that cause the engine lights to flash include an engine misfire, a loose fuel cap, and bad oxygen sensors. Unfortunately, the check engine light flashing is something a lot of drivers tend to ignore.

Finding Reset Button on AC Units

Look for the clearly labeled 'reset' button. Upon locating it, press the button for approximately three seconds and monitor the air conditioner. Verify if the AC starts operating immediately; if not, press the button again for an additional three seconds.

Blinking lights are usually a sign that something is wrong with your appliance. In the case of an air conditioner, it could be caused by a number of different things: a faulty capacitor, low refrigerant levels, or a clogged air filter. Of these three potential causes, a clogged air filter is the most common.

It is most often the case that your indoor unit does not know there is a problem and keeps running. Occasionally, resetting the system will solve the problem. You can reset your thermostat system by turning the thermostat off, waiting thirty seconds, then turning it back on.

Lights flicker when your AC turns on because electricity is pulled away from them momentarily to support the enormous power draw required to turn on your air conditioner. It's likely not a severe problem, and it's certainly not a spook or spirit trying to get your attention.

0 – Fuel and air metering, and auxiliary emission controls. 1 – Fuel and air metering. 2 – Fuel and air metering (injector circuit) 3 – Ignition systems or misfires.

The most common cause is any defects in the ignition system. Another popular culprit is a faulty fuel system. These may involve swapping out pricier parts such as fuel injectors. The third possible explanation for engine misfires is an internal engine problem.

What is a soft failure in a car? ›

Intermittent flashing of your check engine light occurs when your engine experiences what's called either an “intermittent failure” or “soft failure.” Soft failures are caused by engine problems that need certain conditions to appear. The most common example of an intermittent failure is that of broken wires.

The most common issue that causes the AC not to work and the light to flash is due to the system being low on freon. It is possible the system is low on freon due to a leak.

Some air conditioning systems have a reset switch, which is a small, red button. Typically, the button will be on the outdoor unit. If you have a problem locating it on the outdoor unit, you may find relevant details on the equipment's manufacturer's manual. Press the red button for three seconds and release.

This is a standard safety feature in that batteries are designed to cut out in order to prevent overheating. Certain batteries will flash 3 times to indicate a short circuit.

The E3 error code indicates the unit has detected there is no refrigerant. The unit will require a repair service for refrigerant to be added, please visit Request a Repair page for further assistance.

Mitsubishi Aircon Indoor Unit Blinking Light

For blinking twice, it could be faulty indoor thermistor, or both indoor thermistor and PCB. When the light is blinking three or four times, check the indoor fan motor and electronic control PCB if they are functioning normally.