Furnace blower motor is fine, but the air conditioner unit will not start. when it gets a signal to come on there is a click as if a breaker is shutting it off.

The Breakers both look good and are on. There is no fuse that I could see. Is the contactor on the side of the compressor a box about 2" square The Breakers both look good and are on. There is no fuse that I could see. Is the contactor on the side of the compressor a box about 2" square

Hi,

The contactor is about 2" - 3" square and has 2 large wires coming in the bottom, usually about 4 going out the top and 2 very small ones on the sides.

Here is a picture of one on it's side. The small wires may be on one side (brown and yellow shown here) or may be one on each side.




Hi,

The contactor is about 2" - 3" square and has 2 large wires coming in the bottom, usually about 4 going out the top and 2 very small ones on the sides.

Here is a picture of one on it's side. The small wires may be on one side (brown and yellow shown here) or may be one on each side.

One more thing, even if the breakers for the A/C look good, try turning them all the way off then back on it may be partially tripped.

One more thing, even if the breakers for the A/C look good, try turning them all the way off then back on it may be partially tripped.

I turned Breakers off and on and get a humming sound from the unit I turned Breakers off and on and get a humming sound from the unit

If it is humming and nothing is running outside the problem is either

- no high voltage to the condenser, (not likely since you check the breakers and no fuses were found),

- a bad contactor (not likely since you are hearing the hum)

- bad capacitor

You would need a meter that reads up to 250 volts and can check ohms to go from here. Do you have access to a meter? If so I can walk you through what to check




If it is humming and nothing is running outside the problem is either

- no high voltage to the condenser, (not likely since you check the breakers and no fuses were found),

- a bad contactor (not likely since you are hearing the hum)

- bad capacitor

You would need a meter that reads up to 250 volts and can check ohms to go from here. Do you have access to a meter? If so I can walk you through what to check

Now the unit is humming louder and heating up , but not running Now the unit is humming louder and heating up , but not running

Ok, Turn it off

Ok, Turn it off

Since I cannot hear over this website the hum you hear must have been the compressor running rather than the contactor. It would run and overheat then trip the breaker (either internal or external) this would explain why it started when you flipped them.

The problem with the unit is the condenser fan motor. The compressor is running but the fan on top that cools the coils and compressor has failed. The motor can be replaced, it typically will run about $150 - $200 for the motor depending on the size and speeds. The cost for labor to have a professional put it in would be about $150.00 also.

If you feel comfortable you can take this on yourself. It does take some work to get it apart and a bit of electrical knowledge to wire it up correctly.



Since I cannot hear over this website the hum you hear must have been the compressor running rather than the contactor. It would run and overheat then trip the breaker (either internal or external) this would explain why it started when you flipped them.

The problem with the unit is the condenser fan motor. The compressor is running but the fan on top that cools the coils and compressor has failed. The motor can be replaced, it typically will run about $150 - $200 for the motor depending on the size and speeds. The cost for labor to have a professional put it in would be about $150.00 also.

If you feel comfortable you can take this on yourself. It does take some work to get it apart and a bit of electrical knowledge to wire it up correctly.