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OEM Carrier Single Run Capacitor P291-0303 for MA1AJX018000AAAA
Carrier

OEM Carrier Single Run Capacitor P291-0303 for MA1AJX018000AAAA

SKU: CARRIE-MA1AJX018000AAAA-CAPACITOR-P291-0303 Brand: Carrier

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Texas CMBL #19328542014
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Govt POs Accepted

OEM Carrier Single Run Capacitor for Model MA1AJX018000AAAA

This OEM single run capacitor is the factory-specified replacement for the Carrier MA1AJX018000AAAA air handler or fan coil unit. A run capacitor maintains a continuous phase-shifted current to keep the blower or fan motor running efficiently at full speed. When the capacitor weakens or fails, you may notice the motor humming without starting, sluggish fan performance, increased amp draw, frequent tripping of the circuit breaker, or the unit shutting down on thermal overload. Replacing this component with the correct OEM part restores factory-rated motor performance and protects against premature motor failure.

  • Specs: Single run capacitor | Factory-rated MFD and voltage — verify your unit's data plate for exact MFD rating | Round or oval case (per factory spec) | Tight ±3% capacitance tolerance for precise motor support
  • OEM vs Generic: OEM capacitors (P291-0303 / P291-0304) are manufactured to Carrier's exact electrical specifications. Generic alternatives often carry a wider ±10% MFD tolerance, which can cause motor overheating, reduced efficiency, and shortened component lifespan over time.
  • Install Difficulty: 2/5 — Always discharge the capacitor fully before removing any wiring. Tools needed: 1/4" nut driver, insulated needle-nose pliers, and a multimeter capable of capacitance testing. Photograph all wiring connections before disconnecting terminals 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.

Compatibility: Designed for the Carrier MA1AJX018000AAAA air handler unit. OEM part numbers P291-0303 and P291-0304 are both applicable single run capacitor variants for this model — confirm the MFD and voltage rating on your existing capacitor or equipment data plate before ordering. Our parts specialists are available to verify exact fitment prior to purchase. Order today and receive same-day shipping on in-stock OEM Carrier parts.

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 $75
  • 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

Frequently Asked Questions

Does this Capacitor fit my Carrier MA1AJX018000AAAA?
Yes. This is the factory-specified OEM capacitor for the Carrier MA1AJX018000AAAA. 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 MA1AJX018000AAAA?
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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