How do you test a blower motor amp?

How do you check amps on a blower motor?

To interpret the meaning of an amp draw reading, you need to know the capacity of the blower motor that’s turning the fan. This is found in the nameplate of the motor and is called “full load amps,” designated by the initials FLA.

How many amps should a blower motor draw?

Up to 20 Amps or more. Amperage is how much power a device is consuming. The Amps will be labeled on the motor’s name tag.

How do you test a blower motor with a multimeter?

Using a multimeter set on the Ohm scale, use the positive lead and test the black wire. To check the purple wire for current, use your ignition key and turn it to the run setting, turn the heater power to full power and set the multimeter to DC power. If your meter reads “no current” the motor is no good.

What causes a blower motor to over amp?

Blower motor breakdown can be the result of anything from old age to failed bearings, high amp draw, electrical failure in the windings, dirt accumulation, and more. … Otherwise, normal old-age issues, such as bearing failure, cause seizing, which leads to massive electrical failure.

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How many volts should a blower motor receive?

220 volts should be measured for an air handler and 115 volts for a furnace. Next check for 24 volts between the blue and speed wire. If 24 volts exist replace the motor.

What causes a motor to draw higher than normal amps?

What Causes a Motor to Draw Higher Amps? Motors require a certain output in watts in order to function, and this is the result of a voltage multiplied by amps. So when voltage falls, resistance scales up in order to supply the difference, and the motor will also draw more current.

What happens if the amps are too high?

Amperage Provided versus Amperage Required

Device may fail, may run or charge slowly, power supply may overheat, may damage the device being charged — all depending on the magnitude of the difference. The amperage provided by your charger must match or exceed what the device being charged requires.

How can you tell if your blower motor is bad?

What Are Signs Your Blower Motor Needs to Be Replaced?

  1. Poor or Airflow from Air Vents. This will be the first and most obvious sign your blower motor has a problem. …
  2. No Airflow At All From Vents. …
  3. Skyrocketing Energy Bills. …
  4. Strange Noises When You Turn on the Heat. …
  5. Overheating Blower / Weird Smells.