What MFD capacitor do I need for my Lennox AC?

The correct replacement for Lennox model OEM Lennox Dual Run Capacitor — 19J23 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 Dual Run Capacitor — 19J23.

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.

Lennox

OEM Lennox Dual Run Capacitor — 19J23

Name: OEM Lennox Dual Run Capacitor — 19J23
Brand: Lennox
SKU: LNX-19J23
Price: 18.95 USD
Availability: InStock

SKU: LNX-19J23 Brand: Lennox

$18.95 $24.95

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The genuine OEM Lennox 19J23 is a dual run capacitor engineered for use in Lennox condensing and heat pump units. A dual run capacitor combines two capacitors in a single housing — one terminal supports the compressor and the other drives the condenser fan motor — providing the continuous phase-shift current both motors need to run smoothly and efficiently. Always verify the MFD and voltage rating stamped on your old capacitor to confirm a direct match.

Common failure symptoms: a compressor that hums or clicks but won't start, an outdoor fan that stays still or needs a manual spin, warm air during cooling, tripped breakers, and a swollen or leaking capacitor top. Since capacitance weakens over time, intermittent or reduced cooling is often the first sign of a failing unit.

Why OEM matters: the Lennox 19J23 is manufactured to the precise capacitance and voltage tolerances your system was designed around, keeping motor amp draw correct and efficiency at rated levels. Generic capacitors with loose tolerances overheat motors and shorten their life. Installing the factory-specified part is a low-cost way to protect your compressor and ensure reliable operation.

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 Dual Run Capacitor — ...

$18.95

Frequently Asked Questions

Does this Capacitor fit my Lennox OEM Lennox Dual Run Capacitor — 19J23?

Yes. This is the factory-specified OEM capacitor for the Lennox OEM Lennox Dual Run Capacitor — 19J23. 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 — 19J23?

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 Dual Run Capacitor — 19J23

Shipping Information

Return Policy

Frequently Asked Questions