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OEM Lennox Dual Run Capacitor 30+5 MFD 440V Oval — Y9639
Lennox

OEM Lennox Dual Run Capacitor 30+5 MFD 440V Oval — Y9639

SKU: LNX-Y9639 Brand: Lennox
$18.95 $24.95

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Texas CMBL #19328542014
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Govt POs Accepted

The genuine OEM Lennox Y9639 is a 30+5 MFD, 440V oval dual run capacitor, made in the USA, that powers both the compressor and condenser fan motor in your Lennox outdoor unit. Its dual rating delivers two distinct microfarad charges from a single component, providing the running energy that keeps your motors operating smoothly and efficiently. The 440V rating offers robust headroom against voltage spikes for long, reliable service.

Common failure symptoms: A failing capacitor is a leading cause of no-cool service calls. Signs your Y9639 needs replacement include a compressor or fan that hums but fails to start, a condenser fan turning slowly or intermittently, warm air at the registers, hard starting, tripped breakers, or a capacitor top that is domed, leaking, or swollen. Heat and constant cycling wear capacitors out over time.

Why OEM matters: The USA-built Lennox Y9639 matches the precise capacitance, voltage, and tolerance your system was engineered for. Generic replacements with the wrong MFD or voltage can strain motors, reduce efficiency, and void your warranty. Choosing the OEM part ensures an exact fit and dependable, energy-efficient operation for your Lennox equipment.

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 Lennox OEM Lennox Dual Run Capacitor 30+5 MFD 440V Oval — Y9639?
Yes. This is the factory-specified OEM capacitor for the Lennox OEM Lennox Dual Run Capacitor 30+5 MFD 440V Oval — Y9639. 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 Lennox OEM Lennox Dual Run Capacitor 30+5 MFD 440V Oval — Y9639?
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 Lennox 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 Lennox 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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Mike Rivera
HVAC Parts Specialist — Online