What MFD capacitor do I need for my Carrier AC?

The correct replacement for Carrier model HB1AJX048000AAAA 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 HB1AJX048000AAAA.

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 Capacitor P291-4074RS for HB1AJX048000AAAA

Name: OEM Carrier Dual Run Capacitor P291-4074RS for HB1AJX048000AAAA
Brand: Carrier
SKU: CARRIE-HB1AJX048000AAAA-CAPACITOR-P291-4074RS
Price: 24.00 USD
Availability: InStock

SKU: CARRIE-HB1AJX048000AAAA-CAPACITOR-P291-4074RS Brand: Carrier

✓ Guaranteed to fit HB1AJX048000AAAA — or your money back. Terms

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OEM Carrier Dual Run Capacitor P291-4074RS for Model HB1AJX048000AAAA

This OEM dual run capacitor (part number P291-4074RS) is the factory-specified replacement for the Carrier HB1AJX048000AAAA split-system condenser. The dual run capacitor provides the starting torque and continuous run support for both the compressor and condenser fan motor simultaneously. When this component fails, common symptoms include a loud humming with no motor movement, the compressor attempting to start and tripping on thermal overload, or the condenser fan spinning slowly or not at all — all of which result in warm air and system shutdown.

Specs: OEM part number P291-4074RS | Dual run configuration | 370V/440V rated | Round case design | Factory-matched MFD tolerance within ±3% for reliable motor protection
OEM vs Generic: This is the genuine OEM Carrier capacitor, manufactured to exact factory tolerances. Aftermarket alternatives commonly drift ±10% MFD, increasing stress on the compressor and condenser fan motor windings and shortening overall system lifespan.
Install Difficulty: 2/5 — Always discharge the capacitor fully before handling terminals. Recommended tools: 1/4" nut driver, needle-nose pliers, insulated screwdriver, and a multimeter to verify discharge. Photograph all wiring connections before removal to ensure correct reinstallation.
Warranty: Backed by a 1-year OEM factory warranty. Orders placed before cutoff ship the same business day from our stocked warehouse — no waiting on backorders.

Compatibility: Designed specifically for the Carrier HB1AJX048000AAAA 4-ton split-system condenser. Always confirm the MFD rating and voltage printed on your existing capacitor's label or unit data plate before ordering to ensure a direct fit. Have questions about compatibility? Our HVAC parts specialists are available to verify fitment before you buy — no guesswork required.

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 Capacitor P...

$24.00

Frequently Asked Questions

Does this Capacitor fit my Carrier HB1AJX048000AAAA?

Yes. This is the factory-specified OEM capacitor for the Carrier HB1AJX048000AAAA. 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 HB1AJX048000AAAA?

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 Capacitor P291-4074RS for HB1AJX048000AAAA

OEM Carrier Dual Run Capacitor P291-4074RS for Model HB1AJX048000AAAA

Shipping Information

Return Policy

Frequently Asked Questions