What MFD capacitor do I need for my Carrier AC?

The correct replacement for Carrier model Heat Pump PH4GNAB36000AA 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 Heat Pump PH4GNAB36000AA.

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 40+5 MFD Run Capacitor Replacement for Heat Pump PH4GNAB36000AA

Name: OEM Carrier 40+5 MFD Run Capacitor Replacement for Heat Pump PH4GNAB36000AA
Brand: Carrier
SKU: CARRIE-PH4GNAB36000AA-CAPACITOR-P291-4554RS
Price: 56.95 USD
Availability: InStock

SKU: CARRIE-PH4GNAB36000AA-CAPACITOR-P291-4554RS Brand: Carrier

✓ Guaranteed to fit PH4GNAB36000AA — or your money back. Terms

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OEM Carrier Run Capacitor Replacement for Heat Pump PH4GNAB36000AA

The run capacitor in your Carrier PH4GNAB36000AA package heat pump delivers the continuous phase-shifted current that keeps the compressor and condenser fan motor spinning smoothly throughout each cycle. When it starts to fail, the symptoms are easy to spot: the outdoor unit hums or clicks but won't start, the fan barely turns or stops entirely, the compressor short-cycles and trips the breaker, and the system blows warm air while drawing high amperage. A bulged, leaking, or swollen-top capacitor is a clear sign it has failed and needs replacing. This is a dual-run capacitor rated in microfarads (MFD/µF) for the compressor (HERM) and fan (FAN) terminals, typically in the 30/5 to 40/5 MFD range at 370/440 VAC for this 3-ton class unit — always match the value stamped on your existing capacitor. Genuine OEM capacitors hold a tight ±5% tolerance and use 440 VAC-rated, 10,000-hour film construction designed for sustained high-heat operation. Why OEM matters here: inexpensive aftermarket capacitors commonly carry ±10–15% tolerance and lower temperature ratings. Supplying the wrong MFD overstresses the compressor's start and run windings, raising current draw and operating temperature and cutting compressor life short — a repair that costs far more than the capacitor. Install difficulty: 2 of 5. Tools: insulated screwdriver, 1/4" nut driver, and a multimeter. SAFETY: a run capacitor retains a lethal charge even after power is off — always discharge it across the terminals with an insulated resistor or screwdriver before handling, and shut off the disconnect at the outdoor unit. Ships same business day from our stocked warehouse on orders placed before 3 PM CST. Backed by a 1-year OEM warranty and 30-day hassle-free returns on uninstalled parts.

Compatibility

This part is compatible with Carrier model PH4GNAB36000AA. Always verify the part number against your unit's data plate before ordering.

Why Choose OEM?

OEM parts are manufactured to the exact factory specifications for your unit. Generic aftermarket alternatives may fit physically but often use lower-rated components that reduce equipment life and void manufacturer warranties. When the cost difference between OEM and generic is $10-30, the OEM part is always the smarter investment on a system worth $5,000-$15,000.

Shipping & Returns

Same-day shipping on orders before 3 PM CST. Standard delivery 2-5 business days, express options available at checkout. 30-day hassle-free returns on uninstalled parts — free return shipping included. 1-year OEM factory warranty coverage.

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 40+5 MFD Run Capacit...

$56.95

Frequently Asked Questions

Does this Capacitor fit my Carrier Heat Pump PH4GNAB36000AA?

Yes. This is the factory-specified OEM capacitor for the Carrier Heat Pump PH4GNAB36000AA. 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 Heat Pump PH4GNAB36000AA?

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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