What MFD capacitor do I need for my Carrier AC?

The correct replacement for Carrier model HA1CJX018000AAAA 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 HA1CJX018000AAAA.

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 HA1CJX018000AAAA

Name: OEM Carrier Dual Run & Start Capacitor Kit for HA1CJX018000AAAA
Brand: Carrier
SKU: CARRIE-HA1CJX018000AAAA-CAPACITOR-P291-2553RS
Price: 25.00 USD
Availability: InStock

SKU: CARRIE-HA1CJX018000AAAA-CAPACITOR-P291-2553RS Brand: Carrier

✓ Guaranteed to fit HA1CJX018000AAAA — or your money back. Terms

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OEM Carrier Dual Run Capacitor & Start Capacitor for Model HA1CJX018000AAAA

These OEM-matched capacitors — dual run capacitor P291-2553RS and start capacitor P281-1356 — are the factory-specified replacements for the Carrier HA1CJX018000AAAA air handler/condensing unit. Capacitors store and deliver the electrical surge needed to start and sustain the compressor and fan motors during each cooling cycle. 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 failed start capacitor results in hard-starting or failure to start under load, especially on hot days when line voltage sags.

Specs: Dual Run Capacitor P291-2553RS — Round case, 440V rated, factory-matched ±3% MFD tolerance; Start Capacitor P281-1356 — High-capacitance short-duty rated, matched to compressor start winding requirements for the HA1CJX018000AAAA platform
OEM vs Generic: OEM capacitors are manufactured to exact Carrier factory tolerances. Aftermarket units commonly ship at ±10% MFD variance, which accelerates motor winding stress, shortens compressor life, and can void equipment warranties — especially relevant on 18,000 BTU single-zone systems running at or near continuous duty in summer peak loads.
Install Difficulty: 2/5 — Always discharge capacitors fully before handling (use a 20,000-ohm resistor or insulated screwdriver across terminals). Tools needed: 1/4" nut driver, needle-nose pliers, insulated screwdrivers, multimeter with capacitance mode. Photograph all wiring connections before removal. Label HERM, FAN, and C terminals before disconnecting.
Warranty & Shipping: 1-year OEM factory warranty against defects. Orders placed before 3 PM local time ship same business day from our climate-controlled warehouse. Capacitors are individually tested and bagged with terminal labels included.

Compatibility: These capacitors are specified for the Carrier HA1CJX018000AAAA 18,000 BTU system. Always verify the MFD rating and voltage stamped on your existing capacitor's data label before ordering — MFD values vary within model families based on compressor lot and production run. Our fitment team is available to cross-reference your existing part numbers before you order. In stock and ready to ship today — get your system back online fast.

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 HA1CJX018000AAAA?

Yes. This is the factory-specified OEM capacitor for the Carrier HA1CJX018000AAAA. 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 HA1CJX018000AAAA?

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 HA1CJX018000AAAA

OEM Carrier Dual Run Capacitor & Start Capacitor for Model HA1CJX018000AAAA

Shipping Information

Return Policy

Frequently Asked Questions