How do you diagnose a bad condenser fan motor?

How do you diagnose a bad condenser fan motor?

The most telltale signs that there’s an issue with the fan motor are:

1. The cooling fans won’t turn on.
2. The fan turns on when the AC is running, but the blades rotate slowly.
3. You can hear a rattling noise coming from the condenser unit.
4. It smells like something’s burning.
5. Blown fuse.

How do I choose a condenser fan motor?

Using the specifications of the fan blade is the best way to determine the correct horsepower for a replacement condenser fan motor. The diameter, angle and number of fan blades, along with the RPM of the motor, are the pieces of information necessary to make this determination.

How do I know if my fan motor is bad?

Signs and Symptoms of a Bad AC Fan Motor

1. The fan won’t start even though the AC is on.
2. The fan won’t stop, even when you shut the AC off.
3. The fan turns on, yet the blades are rotating very slowly.
4. There’s a rattling noise coming from the condenser unit when the fan is turned on.

What causes outside AC fan to stop working?

One of the most common reasons fans stop spinning is because of a dead capacitor. The AC’s capacitors are small, cylinder components that send energy signals to power the fan motor and the rest of the AC unit. Capacitors can go bad over time and need to be replaced.

How many ohms should a fan motor be?

A good motor should read less than 0.5 ohms. Any value greater 0.5 ohms indicate trouble with the motor.

How do I test a fan motor with a multimeter?

To test your motor for short to ground, you’ll need to set the multimeter to ohms and disconnect the motor from its power source. Then inspect each wire and look for infinite readings. Alternatively, if you get a reading of 0, you might have a cable issue.

Does HP matter on condenser fan motor?

Although it is not too difficult to change a condenser fan motor, it is still possible to do it incorrectly. Of course you need a motor that operates at the same voltage, phase, and frequency of the original motor and it should also be the same horsepower.

How much does it cost to replace a condenser fan motor?

AC Fan Motors Cost Replacing the condenser fan motor in an AC unit costs $400 on average, including labor. It might cost only $300 but could cost up to $600. However, if your AC is still under warranty the cost of the part is covered (but usually not the labor).

How do I know if my AC motor is bad?