What MFD capacitor do I need for my Lennox AC?

The correct replacement for Lennox model OEM Lennox Run Capacitor 45 MFD 440V Round — 19J02 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 Run Capacitor 45 MFD 440V Round — 19J02.

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.

IMAGE COMING SOON

Lennox

OEM Lennox Run Capacitor 45 MFD 440V Round — 19J02

Name: OEM Lennox Run Capacitor 45 MFD 440V Round — 19J02
Brand: Lennox
SKU: LNX-19J02
Price: 18.95 USD
Availability: InStock

SKU: LNX-19J02 Brand: Lennox

$18.95 $24.95

OEM Guaranteed

Same-Day Ship

30-Day Returns

Secure Checkout

Texas CMBL #19328542014

SAM.gov Registered

Govt POs Accepted

The genuine OEM Lennox 19J02 is a 45 MFD, 440V round run capacitor built to the FirstChoice brand specification for Lennox condensing units and air handlers. A run capacitor stores and delivers a steady electrical charge that keeps the compressor or fan motor running smoothly and efficiently throughout the entire operating cycle. Without a healthy capacitor, your Lennox system loses the phase shift it needs to maintain proper torque, which directly affects cooling performance and energy consumption.

When the 19J02 capacitor weakens or fails, you may notice the compressor or fan struggling to start, a humming outdoor unit that won't spin up, intermittent shutdowns on hot days, higher electric bills, or a bulging and leaking capacitor top. Because a failing capacitor draws excess current, it can shorten the life of the motor it serves if left unaddressed.

Choosing the OEM 19J02 ensures the exact microfarad rating, voltage tolerance, and terminal configuration engineered for your Lennox equipment. Generic substitutes with mismatched capacitance can under- or over-drive the motor and void warranty coverage. Installing the correct factory-spec part restores rated efficiency, protects the compressor, and keeps your system running as Lennox intended.

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 Run Capacitor 45 MFD ...

$18.95

Frequently Asked Questions

Does this Capacitor fit my Lennox OEM Lennox Run Capacitor 45 MFD 440V Round — 19J02?

Yes. This is the factory-specified OEM capacitor for the Lennox OEM Lennox Run Capacitor 45 MFD 440V Round — 19J02. 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 Run Capacitor 45 MFD 440V Round — 19J02?

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.

Menu

OEM Lennox Run Capacitor 45 MFD 440V Round — 19J02

Shipping Information

Return Policy

Frequently Asked Questions