What MFD capacitor do I need for my Carrier AC?

The correct replacement for Carrier model FB4ASA048000AAAA 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 FB4ASA048000AAAA.

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 Single Run Capacitor P291-1503 for FB4ASA048000AAAA

Name: OEM Carrier Single Run Capacitor P291-1503 for FB4ASA048000AAAA
Brand: Carrier
SKU: CARRIE-FB4ASA048000AAAA-CAPACITOR-P291-1503
Price: 21.00 USD
Availability: InStock

SKU: CARRIE-FB4ASA048000AAAA-CAPACITOR-P291-1503 Brand: Carrier

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OEM Carrier Single Run Capacitor P291-1503 for Model FB4ASA048000AAAA

This OEM single run capacitor (part number P291-1503) is the factory-specified replacement for the Carrier FB4ASA048000AAAA air handler. Unlike dual run capacitors, a single run capacitor is dedicated solely to the blower motor, providing the precise electrical charge required to start and maintain efficient motor operation. When this capacitor fails, you'll typically notice the blower motor humming without spinning, the air handler failing to move air entirely, or the system tripping on thermal overload due to motor strain — all signs pointing to a capacitor that can no longer hold its rated charge.

Specs: Single run capacitor | Factory-matched MFD rating | 370V/440V rated | Round or oval case (verify against data plate) | OEM part number P291-1503 | ±5% tolerance per factory spec
OEM vs Generic: This is a genuine Carrier OEM capacitor manufactured to exact factory tolerances. Aftermarket units commonly deviate ±10% or more in MFD rating, placing unnecessary stress on the blower motor windings and significantly shortening motor service life — a far more expensive repair.
Install Difficulty: 2/5 — Always discharge the capacitor fully before handling any terminals (use an insulated resistor or dedicated discharge tool). Tools needed: 1/4" nut driver, needle-nose pliers, and a multimeter to verify the old capacitor has failed. Photograph all wiring connections before removal to ensure correct reinstallation.
Warranty: Backed by a 1-year OEM factory warranty against defects. Orders placed before cutoff ship same business day from our climate-controlled warehouse.

Compatibility: Designed specifically for the Carrier FB4ASA048000AAAA 4-ton air handler. Always cross-reference the MFD and voltage rating printed on your existing capacitor and the unit's data plate before ordering to confirm an exact match. Our parts specialists are available to verify fitment — don't guess on a capacitor replacement. Order today and your part ships 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 $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

OEM Carrier Single Run Capacitor...

$21.00

Frequently Asked Questions

Does this Capacitor fit my Carrier FB4ASA048000AAAA?

Yes. This is the factory-specified OEM capacitor for the Carrier FB4ASA048000AAAA. 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 FB4ASA048000AAAA?

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 Single Run Capacitor P291-1503 for FB4ASA048000AAAA

OEM Carrier Single Run Capacitor P291-1503 for Model FB4ASA048000AAAA

Shipping Information

Return Policy

Frequently Asked Questions