Same-day shipping before 3PM CST · 35,000+ OEM Parts · Texas CMBL & SAM.gov Registered · Government POs Accepted

Menu

Home Shop All Account Cart
OEM Carrier Single Run Capacitor 4 MFD 370V for PY2PNB042090AB
Carrier

OEM Carrier Single Run Capacitor 4 MFD 370V for PY2PNB042090AB

SKU: CARRIE-PY2PNB042090AB-CAPACITOR-P291-0403 Brand: Carrier
✓ Guaranteed to fit PY2PNB042090AB — or your money back. Terms

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014
SAM.gov Registered
Govt POs Accepted

OEM Carrier Single Run Capacitor 4 MFD 370V for Model PY2PNB042090AB

This OEM single run capacitor is the factory-specified replacement for the Carrier PY2PNB042090AB packaged unit. The run capacitor maintains the precise phase shift needed to keep the motor running smoothly after startup. When this component fails, you'll typically notice the compressor or fan motor humming but not spinning, or the unit tripping on thermal overload shortly after attempting to start. Left unchecked, a weak or failed run capacitor accelerates motor winding damage and can lead to a costly compressor replacement.

  • Specs: 4 MFD (microfarad) ± 5% | 370 VAC rated | Oval case | 50/60 Hz | OEM Totaline/Carrier part numbers P291-0403 and P291-1503 (15 MFD 370V, fan motor circuit) — verify your data plate before ordering
  • OEM vs Generic: OEM capacitors are manufactured to Carrier's exact tolerance specifications. Generic units frequently run outside ±5% MFD tolerance, causing premature motor stress, increased current draw, and shortened equipment life.
  • Install difficulty: 2/5 — Always discharge the capacitor fully before handling terminals. Tools needed: 1/4" nut driver, insulated needle-nose pliers, multimeter with capacitance mode. Photograph all wiring connections before disconnecting. Follow all local electrical codes and shut off power at the disconnect before beginning.
  • Warranty: 1-year OEM factory warranty against defects. Ships same business day from our warehouse when ordered before 3 PM local time.

Compatibility: Designed for Carrier model PY2PNB042090AB packaged units. Note that P291-1503 (15 MFD 370V) is the companion fan motor run capacitor for the same unit and has been superseded by P291-1504. Always match the MFD rating and voltage to your unit's data plate before installing. Our fitment team is available to verify compatibility before you order — no guesswork required.

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

Frequently Asked Questions

Does this Capacitor fit my Carrier PY2PNB042090AB?
Yes. This is the factory-specified OEM capacitor for the Carrier PY2PNB042090AB. 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 PY2PNB042090AB?
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.
Home Shop Search Account Cart
Fitment Guaranteed
MR
Mike Rivera
HVAC Parts Specialist — Online