Why would a condenser fan motor run backwards?

An abrupt cycle of power can cause a motor to run backwards. If you turn the power off again and wait 10 seconds or so (enough for blade to stop spinning) it should run the right way. Put the capacitor back the other way and try again.

How do I know if my condenser motor is bad?

7 Signs and Symptoms of a Bad AC Fan Motor

  1. AC Fan Doesn’t Start. Even though you have the AC turned on, the fan does not start.
  2. AC Fan Doesn’t Stop. …
  3. Slow Rotating Blades. …
  4. Outside Fan Blades Are Still. …
  5. Rattling, Humming and Buzzing Noises. …
  6. AC Runs Intermittently. …
  7. No Cold Airflow.

Can a single phase fan run backwards?

Once started, a single phase induction motor will happily run in either direction. To reverse it, we need to change the direction of the rotating magnetic field produced by the main and starter windings. And this can be accomplished by reversing the polarity of the starter winding.

Why is my fan not spinning on my AC unit?

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.

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How much does it cost to replace condenser fan motor?

The average cost of a condenser fan motor is between $300 and $500 (not including installation). If the compressor breaks, you are looking at a much costlier problem which could cost up to $2000. In some cases, your fan motor may be under warranty.

What happens when the condenser fan motor fails?

However, a condenser (outdoor) fan-motor failure can be even worse. Since the refrigerant isn’t being condensed, it causes the pressure on the discharge side to get very high and the compressor (since it isn’t being cooled) gets extremely hot, which breaks down the internal lubricant and contaminates the system.

What happens when a fan motor goes bad?

If there’s something wrong with the fan motor, it could cause the blades to start acting strangely. The blades might not start up when the air conditioner does, or they might not stop spinning once the air conditioner shuts off.

Does the condenser fan always run when the AC is on?

The fan only runs when the system is on and not continuously. There is better dehumidification in your home during the summer months. When your fan is set to AUTO, moisture from cold cooling coils can drip and be drained outside. … It blows back into your home and your AC works hard to remove extra moisture from the air.

Does the AC condenser fan run all the time?

The condenser fan should run whenever the compressor is running. In other words, when the compressor runs the condenser motor should also run. … Normally the condenser fan motor should be running when the compressor is running. Power ( 115 volts AC ) to the motor and it is not running is a bad fan motor.

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Should condenser fan run when AC is off?

Over time, relay switches can become stuck or damaged, preventing the thermostat from communicating with the fan. Essentially, this means that the fan isn’t receiving the commands you’re relaying to the thermostat. So even if you turn your AC off, the fan will continue to run.

What happens if a DC motor is connected to AC supply?

As the motor is DC so the field and armature winding made for DC supply. The winding which is made for DC always has more resistance than the winding which is made for AC. … For this reason, the motor will be run in very less speed on AC supply. When DC motor Runs on AC supply more loss and heat will occur in the motor.

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