Question by  tyler (60)

Why is my air conditioner not turning on?

My air conditioner will not turn on, it just makes a humming noise.


Answer by  scaremall (202)

You could have a bad contactor, shorted capacitor or a defective compressor. All of which are beyond the scope of the average DIYer. Call a quallified service company.


Answer by  StarOne (941)

The humming sound is most likely the compressor running. Since the fan is not being turned on while the compressor is working there is possibility that there is a problem with the fan motor. The first thing you should do is turn off your air conditioner. You don't want the motor to burn out. Then call a repair man.


Answer by  kipcat (1964)

The contactor can be bad, the condensing fan can be bad, or the compressor can be bad. It's also possible that it's not getting a control signal from the thermostat.


Answer by  Xceptional (642)

AC Units greatly differ by brand. Since there are some many types of brands I would insist that you refer to your particular AC User Manual. They are quite useful.


Answer by  Anonymous

The humming noise could be the thermostat sending a signal to the contactor, telling it to come on. Check your power to the condenser unit, may be at the meter panel. Breaker could be tripped

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