What MFD capacitor do I need for my Carrier AC?

The correct replacement for Carrier model PH10JA042000ACAA is this exact part. It is the factory-specified replacement with exact OEM specifications. Using a part with different specifications can cause equipment damage or void your warranty. You can verify this by checking the data plate on your Carrier equipment which lists the model number PH10JA042000ACAA.

My AC hums but will not start. What part do I need?

An AC that hums but will not start is the classic symptom of a failed capacitor. The capacitor provides the electrical boost needed to start the compressor and fan motors. When it fails, you hear the hum of the motor trying to start but it cannot overcome inertia. Other symptoms include the fan spinning slowly, the AC cycling on and off rapidly, or a visibly swollen or leaking capacitor. Replacement cost: $15 to $80 for the part, DIY in 30 minutes.

Is this capacitor compatible with Bryant or Payne systems too?

Many Carrier parts are cross-compatible with Bryant and Payne systems since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across multiple brand labels with different model numbers. To verify cross-compatibility, check your Bryant or Payne equipment service manual for cross-compatible part numbers, or contact info@nationalhvacparts.com with your model number for confirmation.

Carrier

OEM Carrier Dual Run & 40+5 MFD Start Capacitor Kit for PH10JA042000ACAA

Name: OEM Carrier Dual Run & 40+5 MFD Start Capacitor Kit for PH10JA042000ACAA
Brand: Carrier
SKU: CARRIE-PH10JA042000ACAA-CAPACITOR-P291-4054RS
Price: 25.00 USD
Availability: InStock

SKU: CARRIE-PH10JA042000ACAA-CAPACITOR-P291-4054RS Brand: Carrier

✓ Guaranteed to fit PH10JA042000ACAA — or your money back. Terms

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OEM Carrier Dual Run & Start Capacitor Kit (P291-4054RS + P281-8806) for Model PH10JA042000ACAA

This OEM-matched capacitor kit contains both the dual run capacitor (P291-4054RS) and start capacitor (P281-8806) — the two factory-specified capacitors for the Carrier PH10JA042000ACAA packaged heat pump unit. The dual run capacitor sustains the compressor and condenser fan motor during normal operation, while the start capacitor delivers the high-torque burst of current needed to cycle the compressor on. When either fails, symptoms range from a humming compressor that won't start, to a unit that trips on thermal overload, to complete no-cooling/no-heating lockout. Replacing both at the same time is best practice — start capacitors rarely fail alone, and dual run capacitors on the same unit are typically the same age.

Dual Run Capacitor Specs (P291-4054RS): 40+5 MFD | 440V | Round case | ±6% tolerance | 50/60 Hz | AFC 10,000 | Castor Oil protected | No PCB
Start Capacitor Specs (P281-8806): 88–108 MFD | 330V | With bleed resistor | 2.06" diameter × 4.37" height | Factory-matched OEM Totaline/Carrier spec
OEM vs Generic: OEM capacitors are built to exact Carrier factory tolerances. Generic alternatives often carry a wider ±10% MFD variance, which accelerates compressor wear, shortens motor life, and can void equipment warranties. Note: Carrier sources capacitors from sub-manufacturers (e.g., Totaline/BMI); the label will reflect the sub-manufacturer's name — this is normal and correct.
Install Difficulty: 2/5 — Always discharge capacitors before handling. Tools: 1/4" nut driver, needle-nose pliers, multimeter. Photograph all wiring before disconnecting. The start capacitor includes a bleed resistor — ensure it is properly reconnected on installation.
Warranty: 1-year OEM manufacturer warranty. In-stock kit ships same business day from our warehouse when ordered by cutoff.

Compatibility: Engineered as the OEM replacement capacitor pair for Carrier PH10JA042000ACAA packaged heat pump units. Always verify MFD, voltage ratings, and terminal configuration against your unit's data plate before ordering. Need fitment confirmation? Our HVAC parts specialists verify compatibility before you buy — ships today.

Shipping Information

Orders placed before 3PM CST ship same business day
Standard delivery: 2-5 business days
Express shipping available at checkout
Free shipping on orders over $99
Tracking number emailed upon shipment

Return Policy

30-day returns on unused parts in original packaging
Electrical parts (capacitors, contactors, control boards) are final sale once installed
Email info@nationalhvacparts.com to initiate a return
Refunds processed within 5-7 business days

OEM Carrier Dual Run & 40+5 MFD ...

$25.00

Frequently Asked Questions

Does this Capacitor fit my Carrier PH10JA042000ACAA?

Yes. This is the factory-specified OEM capacitor for the Carrier PH10JA042000ACAA. It is a direct drop-in replacement that fits without modification. Always verify the model number on your equipment nameplate before ordering.

How do I replace the capacitor on my Carrier PH10JA042000ACAA?

Difficulty: Easy (20–30 min)
Step 1: Turn off power at breaker. Step 2: Open condensing unit panel. Step 3: Photograph the old capacitor wiring (Common/Herm/Fan). Step 4: Discharge old capacitor with insulated screwdriver. Step 5: Disconnect and remove old capacitor. Step 6: Mount new capacitor, reconnect wires to matching terminals. Step 7: Close panel, restore power, test. Tools: screwdriver, needle-nose pliers.

My AC hums but won’t start. What part do I need?

An AC that hums but won’t start is the classic symptom of a failed capacitor. The capacitor provides the electrical boost to start the compressor. When it fails, you hear humming but the motor can’t overcome inertia. Other symptoms: fan spinning slowly, AC cycling on/off rapidly, or a visibly swollen capacitor. Fix: replace capacitor ($15–$80 DIY, 30 min).

Is this capacitor compatible with Bryant or Payne too?

Many Carrier parts are cross-compatible with Bryant and Payne since all three brands are manufactured by Carrier Global Corporation. The same physical part is often used across brand labels with different model numbers. To verify: check your Bryant or Payne equipment service manual for cross-compatible part numbers, or email info@nationalhvacparts.com with your model number.

Should I use OEM or aftermarket for my Carrier capacitor?

OEM strongly recommended. OEM capacitors have ±6% MFD tolerance vs aftermarket ±10%. The looser tolerance causes motor winding stress, higher temps, and shorter compressor life. Price difference is only $10–$20 — OEM is the clear value choice.

How fast does National HVAC Parts ship?

Orders placed before 3:00 PM CST ship the same business day. Standard delivery is 2–5 business days anywhere in the continental United States. Express shipping available at checkout. We ship from Houston, TX to all 50 states. 30-day return policy on all parts.

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OEM Carrier Dual Run & 40+5 MFD Start Capacitor Kit for PH10JA042000ACAA

OEM Carrier Dual Run & Start Capacitor Kit (P291-4054RS + P281-8806) for Model PH10JA042000ACAA

Shipping Information

Return Policy

Frequently Asked Questions