This part is out of stock right now, so it cannot be added to the cart.
A capacitor gives the motors in your air conditioner a push to start and keeps them running smooth. When a capacitor begins to fail, the motor it serves may hum or fail to spin.
Specifications
- Part number: 33010025
- Brand: Carrier
- Part type: Air conditioner capacitor
- Material: Metallized Polypropylene
- Voltage: 450 V AC
- Wiring: Wire Lead
- 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
Air conditioner motors need extra electrical support to start up and maintain steady rotation. The capacitor stores electrical energy and releases it to assist the motor during operation.
Dual run capacitors power two motors from a single can, using terminals labeled HERM for the compressor, FAN for the outdoor fan, and C for common. Single run capacitors have two terminals and serve one motor. When a run capacitor fails, the fan motor often hums loudly but cannot turn on its own.
Understanding the 33010025 specifications
Every capacitor has distinct physical and electrical properties listed on its body. Matching these ratings carefully ensures the motor runs properly without damage.
The 33010025 capacitor lists the following specifications:
- Material: Metallized Polypropylene
- Voltage: 450 V AC
- Wiring: Wire Lead
Rules for choosing a matching capacitor
When you need to match or replace a capacitor, certain electrical numbers must follow exact guidelines. Never guess or choose arbitrary values.
Always check the microfarad rating, written as µF, MFD, or uF. This number must be the same as the old part, such as a single value or a dual value like 45/5.
The voltage rating on a replacement must be the same or higher. For example, a 440 V capacitor can replace a 370 V unit, but you can never use a lower voltage rating than specified. Shape also matters for mounting. Capacitors are round or oval, so choose the shape that fits into your unit's mounting bracket.
How to replace a capacitor safely
Replacing an air conditioner capacitor involves line voltage wiring. Follow careful safety procedures from start to finish.
- Turn off power at the breaker panel and pull the outdoor disconnect switch.
- Test the electrical connections with a meter to verify that power is fully off.
- Discharge the capacitor terminals using an insulated tool before touching them.
- Take a clear photo of every wire connection to remember the exact layout.
- Move wires one at a time to the matching spots on the replacement unit.
- Secure the capacitor in its mounting bracket and reinstall all service panels before restoring power.
Read your old part
- Locate the label or stamped metal casing on your old air conditioner capacitor.
- Clean off dust to clearly read the part number on the body.
- Check that the part number matches 33010025 directly.
- Confirm the voltage rating is 450 V AC or that your replacement meets or exceeds the required voltage.
- Ensure the physical shape and wiring connection match your mounting space and Wire Lead configuration.
When to call a pro
Working with high voltage electrical circuits carries serious risk. If you are not completely sure how to test for power, discharge the capacitor safely, or reconnect the wires, stop immediately. Hire a licensed HVAC technician to complete the repair safely.
Questions
What does a bad capacitor sound or look like?
A fan that hums but will not spin is often a sign of a bad capacitor rather than a failed motor. The capacitor may also show physical signs like bulging or leaking, though some fail with no visible damage.
Can I replace a capacitor with a higher voltage rating?
Yes. A capacitor voltage rating can be the same or higher than the old part. For example, a 440 V capacitor can replace a 370 V capacitor, but a lower voltage capacitor must never be used.
Does capacitor microfarad (µF) rating have to match?
Yes. The µF or MFD rating must match the rating specified for your equipment. Installing an incorrect microfarad rating can cause motor failure or starting problems.
Why must a capacitor be discharged if the breaker is turned off?
Capacitors store electrical energy like a battery. Even when the main breaker and disconnect are shut off, the capacitor can hold a dangerous electrical charge until it is discharged with an insulated tool.
Related part numbers
- 17400101000020Capacitor, CarrierSame brand and type
- 9181009-16Capacitor Reference Guide, Ice-O-MaticSame part type
- 327972756Gas Valve, CarrierSame brand
- 15012466Condenser Fan Motor, CarrierSame brand
- 89M83Capacitor, LennoxSame part type
- 9181009-13Capacitor, Ice-O-MaticSame part type
- EF34CW246Gas Valve Reference, CarrierSame brand
- 1067-00001-00Capacitor, FetcoSame part type
Browse: Carrier part numbers · Run and start capacitors by part number
All part numbers · Part number replacements · Shop capacitors · Repair guides
Brand names and part numbers identify the part and show fit. HVAC Fitter is not affiliated with, authorized by, or endorsed by any equipment maker. If you are not sure a repair is safe for you, call a licensed HVAC technician.