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When a capacitor goes bad, the motor it powers might fail to turn on. You might hear a motor hum without spinning at all. Knowing the ratings on your old part helps you find a proper match.
Specifications
- Part number: 17400101000020
- Brand: Carrier
- Part type: Capacitor
- Capacitance: 45 uF
- Height: 1 1/2"
- Length: 1 3/4"
- Voltage: 250 V AC
- Width: 1 1/8"
Part listings show 17400101000020 as superseded by 17400101A00489. Check the newer number too.
- µF (MFD): must be the same, like 45/5
- Volts: same or higher (440 can replace 370)
- Shape: round or oval, to fit the bracket
From the maker's and parts sellers' listings for this number. Compare them with the label on your old part.
What this capacitor does in your system
A capacitor stores an electrical charge and releases it to assist electric motors. It gives the motors in your AC a push to start and keeps them running smooth.
If the capacitor becomes weak or fails, the motor cannot start properly. A fan that hums but will not spin is often a bad capacitor, not a bad motor.
Understanding the 17400101000020 specs
The label on your old part contains specific electrical ratings and physical measurements. Match these values carefully when looking at a replacement.
- Capacitance: 45 uF (also written as µF or MFD). This microfarad rating must match the old part.
- Voltage: 250 V AC. Voltage on a replacement must be the same or higher.
- Height: 1 1/2".
- Length: 1 3/4".
- Width: 1 1/8".
Rules for matching a replacement capacitor
Capacitor µF must match the old part. Do not change the microfarad rating when choosing a replacement.
Voltage ratings can be the same or higher. For example, a 440 V capacitor can replace a 370 V one, but never the other way around.
Physical size and shape matter for mounting. Round and oval capacitors with the same ratings do the same job. Pick the shape and dimensions that fit inside the mounting bracket.
Safe steps for inspecting and replacing
Working around high voltage requires strict safety steps. A contactor carries 240 V to an outdoor unit, which can kill.
Follow these steps when checking or swapping the part:
- Turn off power at the main circuit breaker.
- Pull the outdoor disconnect handle at the outdoor unit.
- Use a meter to test and confirm that no power is present.
- Discharge the capacitor terminals using an insulated tool before touching them.
- Take a photo of every wire before removing the old part.
- Move wires one at a time to the matching spots on the replacement part.
Read your old part
- Check the part number printed on your old unit to confirm it reads 17400101000020.
- Verify the capacitance rating on the old label reads 45 uF.
- Check the voltage rating on the label to confirm it lists 250 V AC.
- Measure the old case dimensions to make sure 1 1/2" height, 1 3/4" length, and 1 1/8" width will fit your bracket.
When to call a pro
Working with electrical wiring carries a serious risk of shock. Hire a licensed HVAC technician for any step you are not sure you can do safely.
Questions
What is the capacitance rating of part 17400101000020?
The capacitance rating is 45 uF. The replacement you choose must match this microfarad value.
Can I use a higher voltage capacitor instead of 250 V AC?
Yes. A capacitor voltage rating can always be the same or higher. A higher voltage rating handles the electrical load safely, but you must never use a lower voltage rating.
Has part number 17400101000020 been superseded?
Yes, this part number is superseded by part number 17400101A00489. Check your old label to verify your numbers.
Why is my AC fan humming but not turning?
A fan that hums but will not spin is often caused by a bad capacitor rather than a bad motor. The capacitor provides the electrical boost the motor needs to start spinning.
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