What amp contactor do I need for my Lennox system?

The correct replacement for Lennox model OEM Lennox Contactor — 10G19 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 — 10G19.

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 — 10G19

Name: OEM Lennox Contactor — 10G19
Brand: Lennox
SKU: LNX-10G19
Price: 28.95 USD
Availability: InStock

SKU: LNX-10G19 Brand: Lennox

$28.95 $38.95

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The genuine OEM Lennox 10G19 contactor is the high-voltage switch inside your outdoor condensing unit that energizes the compressor and condenser fan motor. When the thermostat calls for cooling, 24-volt control power pulls in the contactor coil, closing the main contacts to send line-voltage power to the compressor. The 10G19 cycles thousands of times each season, making it one of the hardest-working electrical components in a Lennox system.

Common failure symptoms: contactors wear out from arcing and heat. Telltale signs include an outdoor unit that hums but won't start, a compressor and fan that won't shut off, chattering or buzzing at the contactor, pitted or burned contacts, and a melted or corroded housing. A stuck or welded 10G19 can leave the unit running continuously, while burnt contacts prevent it from starting at all.

Why OEM matters: the factory 10G19 is matched to your Lennox unit's coil voltage, contact rating, and amperage draw, ensuring reliable pull-in and safe switching under full load. Generic contactors with mismatched ratings run hot, fail early, and can damage the compressor. Choose OEM for correct fit and dependable, long-term performance.

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 — 10G19

$28.95

Frequently Asked Questions

Does this Contactor fit my Lennox OEM Lennox Contactor — 10G19?

Yes. This is the factory-specified OEM contactor for the Lennox OEM Lennox Contactor — 10G19. 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 — 10G19?

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 — 10G19

Shipping Information

Return Policy

Frequently Asked Questions