What amp contactor do I need for my Lennox system?

The correct replacement for Lennox model OEM Lennox Contactor 3-Pole 40A 24V — Y4626 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 Contactor 3-Pole 40A 24V — Y4626.

My AC clicks but the compressor does not turn on. What is wrong?

Clicking from the outdoor unit without the compressor starting usually means a worn contactor. The contactor is the relay that sends power to the compressor. When its contacts are pitted or worn, it clicks but cannot establish a solid electrical connection. Other symptoms: visible pitting or burn marks on the contactor face, AC works intermittently, or buzzing from the contactor.

Lennox

OEM Lennox Contactor 3-Pole 40A 24V — Y4626

Name: OEM Lennox Contactor 3-Pole 40A 24V — Y4626
Brand: Lennox
SKU: LNX-Y4626
Price: 28.95 USD
Availability: InStock

SKU: LNX-Y4626 Brand: Lennox

$28.95 $38.95

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The genuine OEM Lennox Y4626 (FirstChoice EC40324-EW) is a heavy-duty 3-pole, 40-amp contactor with a 24-volt control coil, built to switch line power across three legs to the compressor and condenser fan in larger Lennox systems. When the 24V coil is energized by the control circuit, all three poles close to feed power to the outdoor unit; the higher 40-amp rating and three-pole design suit larger-tonnage or three-phase applications that demand extra switching capacity.

Common failure symptoms: As the Y4626 ages, contacts pit and burn from repeated arcing, and the coil can lose its ability to pull the poles closed. Look for an outdoor unit that hums but won't run, chattering or buzzing at the contactor, uneven power across the poles, visible arcing or scorching, intermittent cooling, or a compressor that won't shut off due to welded contacts.

Why OEM matters: The factory Lennox Y4626 delivers the exact 3-pole layout, 40-amp contact rating, and 24V coil your equipment was designed to use. OEM specification ensures balanced switching across all legs, correct heat handling, and a precise mounting fit — critical protection for the compressor in high-capacity Lennox units where an underrated substitute can fail prematurely.

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 Contactor 3-Pole 40A ...

$28.95

Frequently Asked Questions

Does this Contactor fit my Lennox OEM Lennox Contactor 3-Pole 40A 24V — Y4626?

Yes. This is the factory-specified OEM contactor for the Lennox OEM Lennox Contactor 3-Pole 40A 24V — Y4626. 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 contactor on my Lennox OEM Lennox Contactor 3-Pole 40A 24V — Y4626?

Difficulty: Medium (30–45 min)
Step 1: Turn off breaker. Step 2: Open condensing unit panel. Step 3: Photograph ALL wiring on the contactor. Step 4: Label each wire with tape. Step 5: Disconnect wires and remove old contactor. Step 6: Mount new contactor, reconnect wires matching your photo. Step 7: Restore power and test.

My AC clicks but the compressor won’t turn on. What’s wrong?

Clicking from the outdoor unit without the compressor starting = worn contactor. The contactor sends power to the compressor. When its contacts are pitted, it clicks but can’t make solid contact. Look for: visible pitting/burn marks on the contactor face, intermittent operation, or buzzing.

Is this contactor 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 contactor?

OEM recommended for reliability and warranty compatibility. OEM parts match exact factory specifications for proper fit, performance, and safety. While aftermarket alternatives cost less upfront, the risk of improper fit and reduced lifespan usually makes OEM the better value long-term.

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 Contactor 3-Pole 40A 24V — Y4626

Shipping Information

Return Policy

Frequently Asked Questions