What MFD capacitor do I need for my Lennox AC?

The correct replacement for Lennox model OEM Lennox Supco SPR5 Ultra Hard Start Kit 1-3 HP — Y8810 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 Lennox equipment which lists the model number OEM Lennox Supco SPR5 Ultra Hard Start Kit 1-3 HP — Y8810.

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.

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Lennox

OEM Lennox Supco SPR5 Ultra Hard Start Kit 1-3 HP — Y8810

Name: OEM Lennox Supco SPR5 Ultra Hard Start Kit 1-3 HP — Y8810
Brand: Lennox
SKU: LNX-Y8810
Price: 18.95 USD
Availability: InStock

SKU: LNX-Y8810 Brand: Lennox

$18.95 $24.95

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The Y8810 is a genuine OEM Lennox Supco SPR5 Ultra Start hard start kit that includes an integrated start capacitor. Designed for single-phase compressors rated 1 to 3 HP and operating at 208-265 VAC, this kit delivers the extra starting torque a compressor needs to overcome high head pressure and begin rotation quickly. It is a factory-approved solution for Lennox condensing units and heat pumps where the compressor struggles to start.

Common signs that your compressor needs a hard start kit include hard starting, a humming or grunting noise on startup, dimming house lights when the unit kicks on, and repeated tripping of the compressor's internal overload. A failing kit can leave the compressor drawing locked-rotor amps far too long, accelerating wear and risking premature compressor failure.

Choosing the OEM Lennox Y8810 ensures the start assist is matched to the electrical and mechanical demands of your Lennox compressor. Generic hard start devices can over-boost or under-boost the motor, leading to inconsistent starts or damaged windings. This OEM kit protects your equipment, maintains rated performance, and keeps your Lennox warranty and reliability intact.

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 Lennox Supco SPR5 Ultra Hard...

$18.95

Frequently Asked Questions

Does this Capacitor fit my Lennox OEM Lennox Supco SPR5 Ultra Hard Start Kit 1-3 HP — Y8810?

Yes. This is the factory-specified OEM capacitor for the Lennox OEM Lennox Supco SPR5 Ultra Hard Start Kit 1-3 HP — Y8810. 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 Supco SPR5 Ultra Hard Start Kit 1-3 HP — Y8810?

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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OEM Lennox Supco SPR5 Ultra Hard Start Kit 1-3 HP — Y8810

Shipping Information

Return Policy

Frequently Asked Questions