What MFD capacitor do I need for my Carrier AC?

The correct replacement for Carrier model HB1CJX018000AAAA 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 HB1CJX018000AAAA.

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.

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OEM Carrier Dual Run & Start Capacitor Kit for HB1CJX018000AAAA

Name: OEM Carrier Dual Run & Start Capacitor Kit for HB1CJX018000AAAA
Brand: Carrier
SKU: CARRIE-HB1CJX018000AAAA-CAPACITOR-P291-2553RS
Price: 25.00 USD
Availability: InStock

SKU: CARRIE-HB1CJX018000AAAA-CAPACITOR-P291-2553RS Brand: Carrier

✓ Guaranteed to fit HB1CJX018000AAAA — or your money back. Terms

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OEM Carrier Dual Run & Start Capacitor Replacement for Model HB1CJX018000AAAA

These factory-specified OEM capacitors — dual run capacitor P291-2553RS and start capacitor P281-1896S — are the exact replacements for the Carrier HB1CJX018000AAAA system. Capacitors store and release the electrical charge required to start and run the compressor and condenser fan motor. A failing dual run capacitor typically causes a loud hum with no motor movement, intermittent short-cycling, or a compressor that trips on thermal overload. A failing start capacitor prevents the compressor from starting under load, often resulting in a locked rotor condition and tripped breakers. Replacing both at the same time is widely recommended by HVAC technicians to avoid a repeat service call.

Part Numbers & Specs: Dual Run Capacitor P291-2553RS | Start Capacitor P281-1896S | Factory-matched MFD tolerance ±3% | 370V/440V rated as specified by Carrier for this model
OEM vs Generic: OEM capacitors are manufactured to exact Carrier factory tolerances. Aftermarket alternatives frequently deviate ±10% MFD, which accelerates motor winding wear and can shorten compressor life significantly — costing far more in the long run than the price difference at purchase.
Install Difficulty: 2/5 — Always discharge capacitors fully before handling — stored charge can be lethal even with power off. Tools needed: insulated screwdriver, 1/4" nut driver, needle-nose pliers, and a multimeter capable of capacitance testing. Photograph all wiring connections before disconnecting. If uncertain, consult a licensed HVAC technician.
Warranty & Shipping: Backed by a 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our climate-controlled parts warehouse.

Compatibility: These capacitors are factory-matched for the Carrier HB1CJX018000AAAA system. Always verify MFD rating, voltage, and terminal configuration against your unit's data plate before installing. Our parts specialists are available to confirm fitment — reach out before ordering if you have any questions. Order today and your parts ship the same business day.

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 & Start Cap...

$25.00

Frequently Asked Questions

Does this Capacitor fit my Carrier HB1CJX018000AAAA?

Yes. This is the factory-specified OEM capacitor for the Carrier HB1CJX018000AAAA. 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 HB1CJX018000AAAA?

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 & Start Capacitor Kit for HB1CJX018000AAAA

OEM Carrier Dual Run & Start Capacitor Replacement for Model HB1CJX018000AAAA

Shipping Information

Return Policy

Frequently Asked Questions