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If the reading is 24 volts and the contactor is not engaged, then it is a bad contactor. Placing a meter probe on each terminal, the reading should read 24 volts between them. The two small wires (often colored yellow & white) usually attach at either side of the side of the contactor. I would start by using a multimeter to check for 24 volts at the contactor.
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If you you have 220 volts coming out (contactor is good) then check the capacitor or bring it in to U-FIX-IT for a free bench check.
Testing the contactor on air conditioner outdoor unit You can prove the contactor is the problem by using a multi-meter or you can take your contactor to your nearest U-FIX-IT store for a free bench test. Failure of the contactor (see picture above) most often produces this symptom. Your next troubleshooting step will be checking the 220 volt power because it is highly unlikely both the compressor and the fan motor would fail at the same time. Section B you cannot hear the a/c compressor running and the fan motor is not turning. Bad a/c fan motors can sometimes be started by “spinning” the fan blade with a stick – it is still a bad motor.A capacitor connected to both the compressor and the motor can fail on just the motor side.Check the 220 volt power is off and discharge the capacitor by shorting between capacitor terminals (with insulated screwdriver) before removing the wires from the terminals. The shock hazard is non-lethal, but it is no fun. If the capacitor tests good then your motor is bad.Ĭaution – Capacitors can store an electric charge (like a battery). Capacitors can be tested with multi-meters that have the ability to read microfarads or you can take your capacitor (and your motor) to your nearest U-FIX-IT store for a free bench test. The malfunction will be a bad capacitor and/or a bad motor.
Section A you can hear the a/c compressor running and the fan motor is not turning.īecause the compressor is running you know there is 220 volts power to the outdoor unit and you know the contactor is doing its job of delivering that 220 volts to the compressor and to the motor.
Troubleshooting the “outdoor air conditioner unit not running” starts with some easy commonsense steps: The following test procedure will help you identify if the problem with your outdoor unit is the fan motor, the capacitor, or the contactor. Many air conditioning malfunctions are not difficult to identify and repair. It is a big deal when the air conditioning goes out on a hot summer day, but there is no need to wait for help to come to you.